Proportional Directional Valve

Transcription

1 roportional Directional Valve Series L.8S Reference: --47-EN-4 Issue: /92

2 2/92

3 Contents age 1 General description he main components Inlet and end section for valve blocks Inlet and intermediate sections Directional valves uxiliary valves General technical data Inlet sections Inlet sections with no control funktion Inlet pressure relief two-stage Inlet pressure relief direct acting way pressure compensator way pressure compensator Intermediate sections Intermediate sections with no control function way pressure compensators way pressure compensators riority sections LU8SS Multi-way pressure compensator roportional pressure reducing valve Directional valves Directional valves L8S-/LF8S Directionla valves LD8S-/LC8S Directional valves LM8S-/L8S Directional sections, LH8S uxiliary valves that bolt-on to the top connection face O nti-shock/make-up valve (secondary pressure relief) Lock check valves (pilot operated non return valves) Load check valves with anti-shock / make-up valve (pilot operated non-return valve with pressure relief on the actuator side) Load control valves Special bolt-on plates LU8SS-RWM12-M uxiliary valves that bolt-on to the bottom connection face U Individual pressure compensators with / without flow-cut-off (torque-limiting) Flow limiters with / without individual pressure compensators ressure reducing compensators /92

4 7.4 2-way compensator End sections End sections with no control function riority sections LU8SU With direct-acting pressure relief With pressure reducing function e.g. for hydraulic joystick Load control valve with float position Intermediate and end section with flow control function SR Combinations with other valve series Combination with SVH Combination with HDS7 with unload function Combination with HDS7 with proirity function Combinations with HDS ccessories Cable operators Electrical joysticks ie bolts Connector plug GDM Liability Note pplications examples Systems with fixed-displacement pump Systems with variable-displacement pump and load-independent lowering of the actuator Systems with a priority circuit in an intermediate section Systems with priority circuit for various pump types (fixed- and variable-displacement pumps) Combination with series SVH4 seat valves Combination with series HDS7 valves /92

5 1 General description 8.1 End section (with no control function) 9.4 ie bolts 6 uxiliary valves, flange-mounting on the top connection face O 3.5 Inlet section (3-way pressure compensator) 5.1 Directional valve, cable operation 5.1 Directional valve, manual operation 5.3 Manual override 5.2 Solenoid directional valve, direct acting 5.3 Solenoid directional valve, two-stage 7 uxiliary valves, flange-mounting on the bottom connection face U he L.8S valve series was developed for mobile applications and it features a robust design and small external dimensions. he L.8S valve range is a very flexible building-block system - its elements can be selected and assembled into a valve block that provides the necessary functions and precisely meets the needs of the application. he following components are available within the range: lock termination components - inlet sections - end sections Intermediate sections - 2-way pressure compensators - 3-way pressure compensators - multi-way pressure compensators Directional valves with auxiliary valves - load check valves - anti-shock valves - individual pressure compensators (2-way) and many more. Within the valve block, directional valve sections are connected in parallel to the pressure, tank and control lines. In a system with a fixed-displacement pump, a typical valve block contains a 3-way compensator, several directional valves and the necessary block termination components. he pump is connected to the valve block by a pressure line. When all directional valves are in the neutral position, the control line unloads the 3-way compensator to tank. he entire flow supplied to the valve therefore passes - with minimal unloaded pressure drop - through the 3-way compensator to the tank port or the carry-over port. When one of the directional valves is operated, the load pressure is signaled through the control line to the 3-way compensator. he 3-way compensator keeps the pressure difference between the pressure and control galleries inside the block at a constant level (the control pressure). he flow rate to the actuator is therefore always independent of the load and proportional to the open flow area of the metering orifice in the directional valve that has been operated. In a system with a pressure-controlled, variable-displacement pump, a typical valve block contains (in addition to the directional valves and block termination components) a 2-way compensator that must be positioned between the pump port and the pressure gallery inside the block. When all directional valves are in the neutral position, the 2-way compensator closes the inlet to the valve block. When one of the directional valves is operated, the 2-way compensator reduces the inlet pressure to a level sufficient to keep the pressure difference between the pressure and control galleries inside the block at a constant level. his ensures that the flow rate to the actuator is independent of the load and proportional to the open flow area of the metering orifice in the directional valve. he flow rate supplied to the valve block therefore matches the actual demand. 5/92

6 When a valve block is supplied by a variable-displacement pump with a load-sensing control. the pump can be connected directly to the valve block by a pressure line. In addition, the control line is connected to the pump control port. If the control pressure can be adjusted directly at the pump control, it is then possible to set the actuator flow rate to the specified value without any additional measures. If the pump control pressure is preset, the specified flow rate is achieved by placing a 2-way compensator before the directional valve. When all directional valves are in the neutral position, the pump is de-stroked. When one of the directional valves is operated then, due to the effect of either the pump control or the 2-way compensator positioned before the directional valve, the necessary control pressure is maintained between the pressure and control galleries inside the block. he flow to the selected actuator is therefore independent of the load and proportional to the open flow area of the metering orifice in the directional valve. In all of the system configurations described up to this point, when several directional valves are operated then, thanks to the shuttle valves situated in the control lines, the actuator with the highest load will dictate the control pressure and the flow rate to the actuator will be independent of the load and proportional to the open flow area of the metering orifice in the directional valve. Load-independence for the less highly-loaded actuators can be achieved by using individual pressure compensators, which reduce the excessive pressure difference sufficiently to ensure that the required control pressure exists at the corresponding directional valve. 2 he main components 2.1 Inlet and end section for valve blocks Every L.8S series valve block requires two block termination components in the form of one inlet section and one end section. hese two components are used for mounting the block, the block tie bolts pass through them, and they are provided with hydraulic ports. 2.2 Inlet and intermediate sections way pressure compensator he 2-way compensator is a valve that controls a pressure differential. It is situated inside the block, before the pressure gallery. In this valve, the inlet pressure is reduced by the amount needed to ensure that the control pressure between the pressure and control galleries inside the block is kept constant. In some models, the valve closes the inlet to the block if the pressure in the control line reaches the setting of an upstream pressure relief valve. he 2-way compensator can be supplied as an inlet section or an intermediate section. 2-way pressure compensator 6/92

7 way pressure compensator he 3-way compensator is a valve that controls a pressure differential. It is situated between the pressure gallery and the tank or carry-over gallery. he valve keeps the pressure difference between the pressure and control galleries inside the block at a constant level and surplus flow passes to the tank or carry-over port. If the pressure in the control line reaches the setting of an upstream pressure relief valve, the 3-way compensator opens the connection to tank, thus limiting the pressure in the pressure gallery inside the block. In one particular model, the function of the 3-way compensator can be customised to suit the requirements of individual applications. he valve can be closed by a shutoff screw that is accessible from outside the valve. his allows the valve to be used on systems with pressure-controlled pumps, while accepting that there will be a reduction in the smoothness of operation. 3-way pressure compensator 2.3 Directional valves he control options for L.8S series directional valves enable continuous (L, LF, LQ, LH, LC and L or on/off (LM, LD) changes to the flow area of the metering orifice, which in turn determines the flow rate that is supplied to the actuator. his is achieved by arranging that in the first group of valves the spool can stop at any desired point along its total stroke, whereas the spools of LM/LD valves travel from one end of the stroke to the other when they are switched, and do not stop at intermediate positions. he various directional valves are differentiated by their type of operation. he L directional valves are mechanically operated by hand lever. he LF directional valves are mechanically operated by remote cable. he LQ directional valves are mechanically operated by a lead-screw. he LH directional valves have hydraulic operation via external ports. he LD and LC directional valves are electrically operated, direct acting. he LM and L directional valves have electro-hydraulic operation. he solenoids of LD, LC, LM and L directional valves are fitted with a manual override as standard, but in the case of the LM and L valves the overrides only work if pressure is present at the valve inlet. Series LH, LM and L directional valves can be equipped with an optional hand lever for manual operation of the valve spool in an emergency. In such cases, the operation of two valves in parallel is dependent on the pressure demands of the actuator connected to each valve. L directional valve 7/92

8 2.4 uxiliary valves he auxiliary valves fit onto the directional valves and can be flange-mounted on the top (connection face O) or bottom (connection face U) of the valve, which is specially designed for this purpose. For mounting on connection face O, these alternative auxiliary valves are available: - nti-shock valve (secondary pressure relief valve with make-up facility) - Load control valve - Load check valve (pilot operated non-return valve) - various special bolt-on plates nti-shock valves are used to prevent over-pressure in the actuator lines and/or cavitation with negative loads. Load control valves provide controlled, load-independent lowering of over-running (pulling) loads. he anti-shock function is integrated and adjustable. Load check valves hold the actuator, which may be under load, with virtually zero leakage. he actuator is released by applying pressure to the other actuator port. For mounting on connection face U, these alternative auxiliary valves are available: - Individual pressure compensator - Flow limiter - ressure-reducing compensator n individual compensator is used when the flow rate to the actuator must be independent of load, but the inlet compensator cannot perform the necessary pressure-control function. In the case of LQ directional valves, the individual pressure compensator is integrated. dditional function blocks are described in detail in the relevant sections. Individual pressure compensator 2.5 General technical data Nominal flow rate l/min max. 15 ctuator flow rate l/min max. 9 Inlet pressure + D 2) bar max. 315 ctuator pressure + 2) bar max. 315 Intermittent press. (max. sec/min) bar max. 33 Return line pressure 1) bar max. 4 Fluid Mineral oil to DIN Fluid temperature C -25 to +8 mbient temperature C -25 to +5 Viscosity range mm 2 /s (cst) to 38 Nominal voltage range of switching solenoids V DC 12V, V 21,6-28 Oil cleanliness NS 1638 class 8 ISO 446 class 19 / 17 / 14 hreaded ports to DIN 3852 Corrosion protection Valve blocks primedcolour: black RL 95 Coating thickness 3 to 5 µm 3) ie bolts M8, tensile grade.9 (tightening torque 3Nm) 1) bar return line pressure for brief periods, with max. inlet pressure 2 bar. 2 bar for and in individual cases. For higher pressures, consult ucher Hydraulics. 2) he stated pressures are the maximum absolute pressure limits for a tank line pressure of bar. Note: Some components have lower individual pressure ratings. 3) Valve blocks that contain components with spool-position feedback are not primed (no corrosion protection) 8/92

9 3 Inlet sections 3.1 Inlet sections with no control funktion hese are used to begin the block when no control functions are needed in the section (e.g. applications). orts, and, and tapped holes for securing the valve block are provided. LU8SOG D 2 M /D M14x ,5 M22x1.5 Minimum length for calculating the total tie bolt length 88 D , ,5 53 M22x1.5 11,5 119,5 Design number L U 8 S O G - M 2 2 / ort threads DIN M22 x 1.5 = M22 DIN M26 x 1.5 = M26 1) Variants / special features 1) ank port M26x1.5 / pressure port M22x1.5 9/92

10 3.2 Inlet pressure relief two-stage his is used to begin the block, and has an integral twostage pressure relief function (e.g. safety pressure relief in an system). orts, and, and tapped holes for securing the valve block are provided. LU8SOD Inlet pressure bar max. 315 Nominal flow rate l/min 12 ressure relief bar adjustable 3 ressure relief characteristic ,5 M14x1,5 M22x1,5 M22x1,5 25 -> (bar) Q (l/min) M8 134, , Minimum length for calculating the total tie bolt length ,5 27 L U 8 S O D - M 2 2 / =... 2) Design number ort threads DIN M22 x 1.5 = M22 DIN M26 x 1.5 = M26 1) Variants / special features 1) ank port M26x1.5 / pressure port M22x1.5 2) Specify the pressure relief setting in bar. /92

11 3.3 Inlet pressure relief direct acting his is used to begin the block, and has an integral directacting pressure relief function (e.g. secondary pressure relief in an system). he application limits must not be exceeded. y screwing in damping and bypass orifices, many possibilities for combating oscillation problems in systems can be created. orts, and, and tapped holes for securing the valve block are provided. LU8SOS Inlet pressure bar max. 315 Nominal flow rate l/min see performancegraph ressure range bar ressure relief characteristic pplication limit M14x1, M22x1,5 M22x1,5 48 p (bar) Q (l/min) M Minimum length for calculating the total tie bolt length 55 L U 8 S O S 1 - M 2 2 / =... 1) ressure range bar = bar = bar = 3 Design number ort threads DIN M22 x 1.5 = M22 Variants / special features 1) Specify the pressure relief setting in bar. 11/92

12 3.4 2-way pressure compensator hese are used to begin the block and have an integral 2-way compensator; optionally with flow cut-off from a preset pressure. typical application is the parallel operation of two valve blocks in an system, where only one spool at a time is operated within each block. orts and, and tapped holes for securing the valve block are provided. he upper tank gallery is not connected to the tank port. he lower tank galleries are not connected to the tank port. LU8SSK Inlet pressure bar max. 315 Nominal flow rate l/min LU8SSK In type SK, the flow cut-off pressure is adjustable Variation of the actuator flow rate with inlet pressure when using an LU8SSK/SK inlet section Flow cut-off function with an LU8SSK inlet section ctuator flow rate Q (l/min) Inlet pressure (bar) Spool size ctuator flow rate Q (l/min) (bar) 3 Only with LU8SSK.. 5,5 26,5 M22x1,5 M14x1,5 122 Screw-in depth for calculating the total tie bolt length M L U 8 S S K - M 2 2 / =... 1) Without flow cut-off With flow cut-off Design number = SK = SK ort threads DIN M22 x 1.5 = M22 Variants / special features 1) Specify the pressure relief setting in bar. 12/92

13 3.5 3-way pressure compensator hese are used to begin the block and have an integral 3-way compensator; optionally with the additional functions shown below. In essence, they can be applied in conjunction with a fixeddisplacement pump for control of unloading, and flow control that is independent of the load. LU8SSCK rovides a 3-way compensator function, with the facility to change over to or constant-pressure systems. his is typical with towed harvesters. LU8SSCS rovides a 3-way compensator function and 2-stage pressure relief that is adjustable from outside the valve. LU8SSCU rovides a 3-way compensator function, with an independent system pressure relief function. LU8SSCX rovides a 3-way compensator function and two-stage pressure relief that is adjustable from outside the valve, and an independent system pressure relief function. he surplus flow is available at port D for other applications. he valve block's own functions have priority over port D. he valve block can be protected at a lower pressure setting by the two-stage relief valve, so that excess flow is always available at port D. LU8SSCW rovides a 3-way compensator function, with an independent system pressure relief function. he surplus flow is available at port D for other applications. he valve block's own functions have priority over port D. When the valve block's pressure relief function is active, there is no longer any flow to port D. LU8SSCE rovides a 3-way compensator function, with an independent system pressure relief function. When it is deenergised, a 2/2 seat valve unloads the internal line to tank, which means that the seat valve must first be energised before the valve block is functional. pplications are in safety circuits, e.g. emergency stop controls. LU8SSCK LU8SSCS LU8SSCU LU8SSCW D LU8SSCX LU8SSCE-...G (,J) D 13/92

14 Inlet pressure bar max. 315 Nominal flow rate l/min 12 Unloaded pressure (D) bar to 13 ressure relief bar adjustable Nominal voltage 1) V DC 12 or 24 ower consumption 1) Watt 27 Duty cycle 1) % Enclosure protection 1) I65 (DIN 45) 1) only with LU8SSCE Maximum flow rate at directional valve when using an LU8SSC inlet section. ctuator flow Q c t (l/min) Intel flow Q IN (l/min) Spool size Unloaded pressure in neutral position For other unloaded pressures, consult ucher 2 -> (bar) SC. For LU8SSCW/SCX when Dp D- > 2 bar Intel flow Q IN (l/min) wo-stage pressure relief characteristic Inlet sections LU8SSCS/SCX System pressure relief characteristic Inlet sections LU8SSCE/SCU/SCW/SCX -> (bar) Q 6 (l/min) 8 -> (bar) Q (l/min) 8 14/92

15 LU8SSCE-...G (,J) ,5 M22x1,5 M22x1,5 84 Screw-in depth for calculating the total tie bolt length M ,5 2, , LU8SSCK/SCS Minimum length for calculating the total tie bolt length with special feature / Only with LU8SSCK ,5 2,5 M22x1,5 M14x1,5 M22x1,5 (Special feature /4 is straight-through tie bolts) 1 84 Screw-in depth for calculating the total tie bolt length Only with LU8SCS M , LU8SSCU/SCW/SCX ,5 27 M22x1,5 Only with LU8SSCU 15 M14x1,5 M22x1,5 47,5 M22x1, Screw-in depth for calculating the total tie bolt length Only with LU8SSCX M ,5 134,5 2 2, /92

16 Connector socket only with LU8SSCE lug connection to DIN 4365 Deutsch D4-2-E4 with protective diode 6KE33C M Junior imer with protective diode 6KE33CV G J L U 8 S S C E - M 2 2 G 1 2 / =... 1) 1=... 2) Without pressure relief, with changeover facility = SCK With two-stage pressure relief = SCS With system pressure relief, direct acting = SCU With system pressure relief, with surplus-flow port = SCW With system pressure relief and 2-stage pressure relief for the valve block, with surplus-flow port = SCX With system pressure relief, with elec. unloaded neutral (Emer. stop) = SCE Design number ort threads DIN M22 x 1.5 = M22 DIN M26 x 1.5 = M26 Connector socket 3) DIN 4365 = G D4-2-E4 = M Junior imer = J Nominal voltage 3) DC 12 V = 12 DC 24 V = 24 Variants / special features 1) Specify the system pressure relief setting in bar. 2) for LU8SSCX, specify the setting for the valve block's two-stage pressure reliefin bar. 3) only with LU8SSCE 16/92

17 4 Intermediate sections 4.1 Intermediate sections with no control function hese intermediate sections are used as spacer plates (e.g. with large port fittings) or, in the case of the LU8S-, for hydraulic partitioning of the and lines within the valve block; is continuous. LU8SL LU8SD LU8S LU8SL LU8SD/ 1 7,5 8 8 M14x L U 8 S D - M 1 4 lock spacer plate = D lock partition plate, and blocked, continuous = lock partition plate, blocked, continuous, in front half ofblock to, in rear half to separate port = L Design number ort threads DIN M14 x 1.5 = M14 (only with LU8SL) 17/92

18 4.2 2-way pressure compensators hese are intermediate sections with an integral 2-way compensator; optionally with flow cut-off from a preset pressure. ypical applications: valve block sections that, in general, experience lower pressures are combined with this compensator to ensure load-independent operation. orts and are provided. LU8SSKC LU8SSKD Inlet pressure bar 315 Nominal flow rate l/min ressure for flow cut-off bar adjustable Variation of the actuator flow rate with inlet pressure when using an LU8SSKC/SKD intermediate section Flow cut-off function with an LU8SSKD intermediate section ctuator flow rate Q (l/min) Spool size ctuator flow rate Q (l/min) Intel pressure (bar) p (bar) 3 13,5 33,5 74 M22x1.5 M14x1.5 Only with LU8SSKD 35 6, , ,5 21,5 L U 8 S S K D - M 2 2 / =... 1) Without pressure relief = SKC With pressure relief = SKD Design number ort threads DIN M22 x 1.5 = M22 Variants / special features 1) Specify the pressure relief setting in bar. (only with LU8SSKD). 18/92

19 4.3 3-way pressure compensators hese 3-way compensators are intermediate sections with the additional functions shown below. In essence, they can be applied in conjunction with a fixed-displacement pump for control of unloading, and flow control that is independent of the load. orts, and D and as appropriate, are provided. LU8SSU rovides a 3-way compensator function with 2-stage pressure relief, and a reduction in the unloaded pressure from the standard 12 bar to approx. 6 bar. LU8SSV rovides a 3-way compensator function, and the surplus flow is available at port D or internally for other applications. he valve block's own functions i.e. on the priorityflow side, have priority over the internal surplus flow or over port D. LU8SSW rovides a 3-way compensator function, and the surplus flow is available at port D or internally for other applications. oth flows are protected by a two-stage pressure relief valve. On reaching the maximum pressure in the priority side, the entire flow is available in the surplus-flow side, which can then be loaded up to the maximum pressure setting. LU8SSK rovides a 3-way compensator function, with the facility to change over to or constant-pressure systems. his is typical with towed harvesters. LU8SSU LU8SSV LU8SSW LU8SSK D D D D Inlet pressure 1) bar max. 315 Nominal flow rate l/min 12 Unloaded pressure (LU8SSU/S/SL/SK) bar see performance graph Unloaded pressure D (LU8SSW/SV) bar see performance graph ressure relief bar adjustable Nominal voltage 2) V DC 12 or 24 ower consumption 2) Watt 27 Duty cycle 2) % Enclosure protection 2) I65 (DIN 45) 1) Inlet pressure for LU8SSU-...G.. and LU8SSW...G.. max. 25 bar. 2) only with electrical unloading 19/92

20 Maximum flow rate at directional valve when using an LU8SSU intermediate section 9 Unloaded pressure in neutral position, intermediate sections LU8SSV/SW For other unloaded pressures, consult ucher Hydraulics 12 ctuator flow rate Q ct (l/min) Spool size -> D (bar) with pd = p withi p D- > 2 bar Intel flow Q IN (l/min) Intel flow (l/min) Maximum flow rate at directional valve when using an LU8SSV/SW intermediate section ctuator flow rate Q ct (l/min) Intel flow Q IN (l/min) Spool size ressure relief characteristic, intermediate section LU8SS. -> (bar) Q (l/min) 8 Unloaded pressure in neutral position, intermediate sections LU8SSU For other unloaded pressures, consult ucher Hydraulics 2 -> (bar) SK, SL S, SU Intel flow (l/min) Only with LU8SSU-...G (, J) 13,5 Only with LU8SSK 33,5 74 M22x1.5 M14x1.5 Not LU8SSV/SK M22x1.5 51, ,5 32 2/92

21 Connector socket only with LU8SSU...G LU8SSW...G lug connection to DIN 4365 G Deutsch D4-2-E4 with protective diode 6KE33C M Junior imer with protective diode 6KE33C J L U 8 S S - M 2 2 G 1 2 / =... 1) With pressure relief = SU With surplus flow port, without pressure relief = SV With surplus flow port, with pressure relief = SW With changeover facility, without pressure relief = SK Design number ort threads DIN M22 x 1.5 = M22 Connector socket 2) DIN 4365 = G D4-2-E4 = M Junior imer = J Nominal voltage 2) DC 12 V = 12 DC 24 V = 24 Variants / special features 1) Specify the pressure relief setting in bar. 2) only with LU8SSU...G (, J) and LU8SSW...G (, J) 21/92

22 4.4 riority sections LU8SS.. he LU8SS.-... priority section contains a priority function for the directional valves fitted on the appropriate side or for an external control system, and a surplus flow side. In the under-supply range (pump flow < total flow needed by the valve block), the surplus flow side will receive only a portion of what it needs, or possibly (pump flow < priority-flow setting) no flow whatsoever. referred applications are in systems. he priority side can also be equipped with a pressure relief valve that ensures a priority-flow cut-off when the pressure setting is reached. For oscillation-prone applications, a damping element (e.g. an accumulator) can be connected to a port specially provided for this purpose. LU8SSO-.. riority LU8SS-.. riority Surp Surp Inlet pressure bar max. 315 Nominal flow rate l/min max. 15 Control p for the compensator bar 12 ressure for flow cut-off on the priority side bar adjustable Flow cut-off on the priority side Q [l/min] p (bar) ressure drop characteristic Dp [bar] , C Q [l/min] = ump port to Surp (Q riority =zero) at Surp = = ump port to Surp at p Surp to > 2 bar C = ump port to riority (control spool in neutral position) 22/92

23 M 14 x M26 x L U 8 S S - M 2 6 / =... 1) Without flow cut-off = O With flow cut-off = Design number ort threads DIN M 26 x 1.5 = M26 S 1 / G 1 = Variants / special features 1) Specify the flow cut-off setting in bar. 23/92

24 4.5 Multi-way pressure compensator he multi-way pressure compensator is an intermediate section, and valve sections can therefore be fitted to either side. his multi-way compensator is intended for all pump systems. It has a priority-flow side and a surplus-flow side, and the functional variants shown below. orts, and are provided. LU8SSMD riority-flow control as 2- and 3-way compensator, with surplus-flow control as 3-way compensator. he priorityflow side is provided with a flow cut-off function, the surplus-flow side with two-stage pressure relief. LU8SSMF riority-flow control as 2- and 3-way compensator, with surplus-flow control as 3-way compensator. he priorityflow side is provided with a flow cut-off function. he surplus-flow control can be de-activated, which allows an or constant-pressure system to be connected. his is typical with towed harvesters. LU8SSMD riority LU8SSMF riority Surp Surp Inlet pressure bar max. 315 Nominal flow rate l/min 12 Unloaded pressure bar see performance graph ressure for flow cut-off ( riority ) bar adjustable ressure for pressure relief ( Surp ) bar adjustable Maximum flow rate at directional valve when using an LU8SSM intermediate section. (riority side) ctuator flow rate Q ct (l/min) Inlet flow Q ZU (l/min) Spool size Maximum flow rate at directional valve when using an LU8SSM intermediate section. (Surplus-flow side) ctuator flow rate Q ct (l/min) Inlet flow Q IN (l/min) Spool size 24/92

25 ressure relief characteristic (priority and surplus flow) Intermediate section LU8SSM. -> R/ (bar) Unloaded pressure in neutral position Intermediate section LU8SSM. -> (bar) QR/ (l/min) Inlet flow Q IN (l/min) Only with LU8SSMF ,5 9 32, ,5 13 2,5 M Only with LU8SSMD LU8SSMF 86 Screw-in depths for calculating the total tie bolt lengths Only with LU8SSMD 1,5 27,5 M14x1,5 44,5 87 M22x1,5 L U 8 S S M - M 2 2 / =... 1) riority and Surp with pressure relief = SMD 2) riority with pressure relief, Surp with changeover facility = SMF Design number ort threads DIN M22 x 1.5 = M22 Variants / special features 1) Specify the pressure relief setting in bar. 2) Flow cut-off priority side 1=, pressure relief surplus-flow side 2= 25/92

26 4.6 roportional pressure reducing valve he 3-way pressure reducing valve holds the pressure at the actuator port at a constant level, as set by the solenoid current. Via the feedback, this function can work with all pressure compensators and pump systems. he relevant additional functions are described below. LU8SDRZ*6S way pressure reducing valve, minimum actuator pressure 8-2 bar. LU8SDRZ*6S way pressure reducing valve, minimum actuator pressure 8-2 bar. Has a 2/2 seat valve for leak-free shut-off of the load. LU8SDRZ*6CS way pressure reducing valve, with a 2/2 seat valve for leak-free shut-off of the load. In addition, the line can be unloaded to tank via a 3/2 directional valve (minimum actuator pressure is uncoupled). LU8SDRZ*6S.-.. LU8SDRZ*6S.-.. LU8SDRZ*6CS.-.. x y x rimary pressure max bar max. 3 Secondary pressure Red (as per pressure range) bar 4,, 16, 25 Nominal flow rate Q max l/min 4 for LU8SDRZ*6S.-.. Nominal flow rate Q max l/min 25 for LU8SDRZ*6S.-.., LU8SDRZ*6CS.-.. ower consumption, pressure reducing valve Solenoid x Solenoid y Watt Nominal voltage V DC 12 or 24 Solenoid current I min I max.25 or.13 ±% 1.9 or.95 ±% Enclosure protection I65 (DIN 45) Leakage in working position, including pilot flow rimary press Q Lv cm 3 /min /92

27 Control characteristic reduced = f ( I solenoid ) djustment ranges 3-way pressure control valve ressure range bar Red. pressure as % of the adjustment ranges Linearity deviation ±%,25,5,75,95 ±% =24V,5 1, 1,5 1,9 ±% =12V Solenoid current Ι () (bar) ,25,5,75,5 1, 1,5 Solenoid current I () 16 4 ressure range bar ressure range bar ressure range bar,95 +% =24V 1,9 +% =12V Control characteristic as a function of the flow rate 3 Red. pressure (bar) R Q(l/min) R - Only with LU8SDRZ*6S.-.. and LU8SDRZ*6CS.-.. Only with LU8SDRZ*6CS M18x /92

28 Connector socket lug connection to DIN 4365 G Deutsch D4-2-E4 M Junior imer J Consult ucher Hydraulics Consult ucher Hydraulics L U 8 S D R Z * 6 S 6 - M 2 2 G / Without auxiliary valve (Q max 4 l/min) = With seat valve on actuator side (Q max 25 l/min) = With seat valve on actuator side and 3/2 unloading valve (Q max 25 l/min) = C Solenoid operation = S Manual operation = M ressure range 8-4 bar = bar = bar = bar = 8 Design number ort threads DIN M18 x 1.5 = M18 Connector socket 1) DIN 4365 = G Nominal voltage for DC 12 Volt = 12 pressure reducing valve DC 24 Volt = 24 Nominal voltage for DC 12 Volt = 12 2/2 seat valve and 3/2 unloading valve DC 24 Volt = 24 Variants / special features 1) For Deutsch and M connector sockets, consult ucher 28/92

29 5 Directional valves 5.1 Directional valves L8S-/LF8S hese directional valve sections, operated by hand lever or remote cable, are distinguished by their slim design and their adaptability. uxiliary functions can be bolted on above or below the valve. o enable this, the appropriate interfaces must be chosen (see the following illustrations). In consultation with the factory, electrical limit switches acting at various switching positions are available. L.8SE...-.**-... No facility for accepting bolt on auxiliary valves L.8SM...-.K*-... For bolt-on auxiliary valves on connection face U uxiliary valve L.8SE...-.M*-... For bolt-on auxiliary valves on connection face O L.8SM...-.MK-... For bolt-on auxiliary valves on connection faces O or U uxiliary valve uxiliary valve uxiliary valve L8S with hand lever LF8S with cable operation Inlet pressure bar 315 ctuator pressure duty cycle = sec/min bar max. 33 Spool size l/min, 16, 25, 4, 63 Operating force on the spool N 17 to 2 ccessories 1) cable operation, see.1 1) y cultivation the cable operating the special desing LF8S.../17 has to be chosen. he purpose of the spool position controls and their variants is to optimise the spool-operation logic, and they should be employed to make the user's task simpler. he various types are described below. Spool types 2 3 3I 3J D 4E 4F 4K /92

30 Spool position control ype 2 1 Spring return from switch position Detent function in switch position Friction detent in switch position C 2 1 D 2 1 E 1 F 2 1 G 1 J 1 L M R U Spring return: he spool returns to switch position automatically. Detent function: he spool is restrained at switch position ; at maximum out-stroke it is also restrained in the respective switch position. Friction detent: detent restraint can be felt at switch position ; at any other position a friction device restrains the spool. 3/92

31 Maximum flow rate at directional valve (without compensator), function ctuator flow rate Q ct (l/min) Dp -> (bar) Spool size Flow characteristic with individual pressure compensator at connection face U 7 ctuator flow rate Q ct (l/min) Spool stroke S (mm) 63 4 Spool size ressure drop / 24 2 ressure drop / (L.8S directional valve), spool at max. stroke / -> (bar) L8S/LF8S /D Spool in switched position -> / (bar) Inlet flow Q IN (l/min) Inlet flow Q IN (l/min) L8S-/LF8S directional valves (without facility for bolt-on auxiliary valves) L8S directional valve 48 18,5 M18x1.5 M18x1.5 ~25 37, ,5 LF8S directional valve 2,1 j8 H Switch position ,7 j ,5 M5 19, /92

32 L8S-/LF8S directional valves (with facility for bolt-on auxiliary valves) Connection face O 7 Connection face U Hand lever = L8S Remote operation = LF8S 2) Load-independent individual operation = E Load-independent parallel operation = M 3-way function = 3 4-way function = 4 Spool function =, D, E, I, J, K L 8 S E 3 1 * * - * * - M 1 8 / ort spool code, 16, 25, 4, 63 = e.g. 1) ort spool code with 3-way function = ** with 4-way function, 16, 25, 4, 63 = e.g. 1) Spool position control = e.g. ttachment to connection face O port threads for line connection = * flange face for auxiliary valve = M ttachment to connection face U without (valve type E) = * with (valve type M) = K Design number ype of connection at face O flange face to factory standard = *** line connection to ports and : DIN M18 x 1.5 = M18 Variants / special features 1) For different, or higher, litre ratings consult ucher Hydraulics. 2) y cultivation the cable operating the special desing LF8S.../17 has to be chosen. 32/92

33 5.2 Directionla valves LD8S-/LC8S hese directional valve sections, with direct-acting switching solenoid or proportional solenoid are distinguished by their slim design and their adaptability. uxiliary functions can be bolted on above or below the valve. o enable this, the appropriate interfaces must be chosen (see the following illustrations). In the on/off solenoid version, the actuator flows at and can be separately preset at any desired flow rate between 2-25 l/min, alternatively > 25-4 l/min. hese values can be altered at any time without any escape of oil. In the proportional valves, to compensate for manufacturing variations it is possible to adjust either the opening point of the control spool, or any predetermined point on the characteristic. L.8SE...-.**-... No facility for accepting bolton auxiliary valves L.8SE...-.M*-... For bolt-on auxiliary valves on connection face O uxiliary valve L.8SM...-.*K-... For bolt-on auxiliary valves on connection face U L.8SM...-.MK-... For bolt-on auxiliary valves on connection faces O and U uxiliary valve uxiliary valve uxiliary valve LD8S with direct-acting on/off solenoid he flow rates at the and actuator ports are adjustable; the standard settings are 25 or 4 l/min. ny required variations must be plainly specified. 95 rotation of the adjuster ring gives a change in flow rate of approx. 5 l/min. Inlet pressure bar 25 ctuator pressure (duty cycle sec/min) djustment range of actuator flow rates Solenoid design Nominal voltage ower consumption bar max. 28 l/min V DC Watt 2 to 25 > 25 to 4 on/off solenoid with mechanical manual override 12V, V 21, (12 V) or 37 (24 V) Duty cycle % Enclosure protection I65 (DIN 45) IMORN! If the maximum nominal voltage is exceeded, the magnet can be damaged 33/92

34 LC8S with direct-acting proportional solenoid In conjunction with flowing pilot oil e.g. LU8SS, only possible with a special version of the LC directional section (unacceptable pressure build-up in the opening area) Inlet pressure bar 25 ctuator pressure (duty cycle = sec/min) bar max. 28 Spool size l/min 5,, 16, 25, 4 Solenoid design proportional solenoid with mechanical manual override Nominal voltage V DC 12 or 24 ower consumption Watt Duty cycle % max. 22 at 2.2 (U N 12V) 1.1 (U N 24V) at I max. 2.2 (U N 12 V) 1.1 (U N 24 V) Enclosure protection I65 (DIN 45) ccessories For electronic controls, see overview brochure 73 Spool types 3 3I 3J 3H H 4 4D 4E F 1 34/92

35 LD/LC Maximum flow rate at LD/LC directional valve (without compensator), function Q (l/min) p (bar) LC ressure drop / in the LC8SM4 directional stage (for spool sizes, 16, 25 or 4) p (bar) / ) 25 - = 16 / - 5 /- 16 / Q (l/min) 25-2) /- 4 Steuerschiebergröße Steuerschiebergröße LC ypical flow characteristic for LC8SM (spool 4D) Q (l/min) V.3.4,5,6,7,8,9 1 1,1 24V Magnetstrom Ι () LC ypical flow characteristic for LC8SM (spool 4 / cylinder ratio 1:1) Q (l/min) V.3.4,5,6,7,8,9 1 1,1 24V Magnetstrom Ι () Steuerschiebergröße Steuerschiebergröße Setting guide (rough setting) Spool size Setting dimension X ctuator flow l/min (approx.) LD8S directional valve (without facility for bolt-on auxiliary valves) 37.5 M18x M18x1.5 Solenoid b Solenoid a 84 Setting dimension X for setting guide /92

36 LD8S directional valve (with facility for bolt-on auxiliary valves) 37.5 Connection face O Solenoid b Solenoid a 8 Setting dimension X for setting guide Connection face U LD8S directional valve (spool types 3I and 3J) Solenoid a LD8S directional valve (spool types 3H and 4H) Solenoid b Manual override on LD8S /92

37 LC8S directional valve (without facility for bolt-on auxiliary valves) 37.5 M18x M18x1.5 Solenoid b Solenoid a 84 Calibration setting 1.9 (rough setting Q Nom 25 or 4 l/min) LC8S directional valve (with facility for bolt-on auxiliary valves) 37.5 Connection face O Solenoid b Solenoid a 8 Calibration setting 1.9 Connection face U (rough setting Q Nom 25 or 4 l/min) LC8S directional valve (spool types 3I and 3J) Solenoid a LC8S directional valve (spool types 3H and 4H) Solenoid b 37/92

38 Connector socket lug connection to DIN 4365 G German D4-2-E4 with protective diode 6KE33C M-Junior-imer with protective diode 6KE33C J On/off solenoid = LD8S roportional solenoid= LC8S L C 8 S E 3 1 * * - N * * - M 1 8 G 1 2 / Load-indepen. individual operation = Load-independent parallel operation = E M 3-way function = 3 4-way function = 4 Spool function =, D, E, F, I, J, H ort spool code for LD8S for way valves 25, 4 = e.g. 25 for LC8S for way valves 5 1),,16,25,4 = e.g. ort spool code for LD8S for 3-way valves = ** for 4-way valves 25, 4 = e.g. 25 for LC8S for way valves 5 1),, 16, 25, 4 = e.g. Without additional operator = * Manual override (manual override only with LD8S ) = N ttachment to connection face O port threads for line connection = * flange face for auxiliary valve = M ttachment to connection face U without (valve type E) = * with (valve type M) = K Design number ype of connection at face O flange face to factory standard = *** line connection to ports and : DIN M18 x 1.5 = M18 Connector socket DIN 4365 = G D4-2-E4 = M Junior imer = J Nominal voltage DC 12 V = 12 DC 24 V = 24 Variants / special features 1) 5 only as slide funktion 4 and 4D available 38/92

39 5.3 Directional valves LM8S-/L8S hese directional valve sections, with two-stage solenoid/ hydraulic control, on/off or proportional, are distinguished by their slim design and their adaptability. uxiliary functions can be bolted on above or below the valve. o enable this, the appropriate interfaces must be chosen (see the following illustrations). Manual overrides are available that act on the pilot stage, or directly on the main stage (non-following type). Endstops for the spool (special feature L.8S.../16) make it possible to limit the maximum actuator flow to any desired value. L.8SE...-.**-... No facility for accepting bolton auxiliary valves L.8SE...-.M*-... For bolt-on auxiliary valves on connection face O uxiliary valve L.8SM...-.*K-... For bolt-on auxiliary valves on connection face U L.8SM...-.MK-... For bolt-on auxiliary valves on connection faces O and U uxiliary valve uxiliary valve uxiliary valve L8SM...-***-... with integral pressure compensator For spool types 3J and 3I, Q max 25 l/min 39/92

40 LM8S with on/off solenoid, two-stage Inlet pressure bar 315 Optional manual override for the valve spool ctuator pressure ( sec/min) Spool size bar max. 33 l/min, 16, 25, 4, 63, 75,9 ressure drop / bar 3.5 at 6 l/min Solenoid design Nominal voltage Volt DC on/off solenoid with mechanical manual override 12V, V 21,6-28 ower consumption Watt 24 Duty cycle % Enclosure protection I65 (DIN 45) ccessories Joystick brochure E-3 IMORN! If the maximum nominal voltage is exceeded, the magnet can be damaged L8S with proportional solenoid, two-stage Inlet pressure bar 315 ctuator pressure ( sec/min) bar max. 33 Optional manual override for the valve spool Spool size l/min, 16, 25, 4, 63, 75,9 ressure drop / bar 3.5 at 6 l/min Solenoid design proportional solenoid with mechanical manual override Nominal voltage Volt DC 12 or 24 ower consumption Watt 16 at 1.6 (U N 12 V).8 (U N 24 V) Duty cycle % at I max. 1.6 (U N 12 V).8 (U N 24 V) Enclosure protection I65 (DIN 45) ccessories Joystick brochure E-3 4/92

41 Spool types 3 3I 3H J 1 4H 4 4D 4E F 2 1 Maximum flow rate at directional valve (without compensator), function ctuator flow rate Q c t (l/min) Dp -> (bar) Spool size ressure drop / -> (L.8S directional valve) / -> (bar) LM8S / L8S D SOOL IN NEURL OSIION 4 LH8S / LM8S / L8S 2 -D SOOL IN SWICHED OSIION Inlet flow Q IN (l/min) Control characteristic (L8SM..) 8 Q (l/min) Spool size ressure drop / (L.8S directional valve), spool at max. switched position -> / (bar) ,7,8,9 1 1,1 1,2 1,3 1,4 1,5 1,6 1,7 12V,4,5,6,7,8 24V Solenoid current l () Inlet flow Q IN (l/min) 41/92

42 LM8S-/L8S directional valve (without facility for bolt-on auxiliary valves) 37,5 ir-bleed point Solenoid energised gives switch position ,5 M18x1.5 M18x1.5 ir-bleed point Solenoid energised gives switch position Solenoid b Solenoid a 37, ,5 LM8S-/L8S directional valve (with facility for bolt-on auxiliary valves) 37,5 Connection face O 7 Solenoid b Solenoid a 28 Connection face U LM8S-/L8S directional valve (spool types 3I and 3J) Solenoid a LM8S-/L8S directional valve (spool types 3H and 4H) Solenoid b Manual override with rotary knob (L.8S...-S..) Manual spool operation with flow setting via rotary knob for actuator port. 31 Only operative in switch position 1. 1) ypes 3I and 3J 2) ypes 3, 4, 4D, 4E and 4F ) 82 2) 42/92

43 Manual override with lever (L.8S...-N..) Switch position 2 ir-bleed point Spool stroke limiter (L.8S.../16) 211,5 69 End-stop for switch position 1 End-stop for switch position 2 Manual override with lever and spool stroke limiter (L.8S...-N.../16) Switch position 2 End-stop for switch position 1 ir-bleed point End-stop for switch position Connector socket lug connection to DIN 4365 G Deutsch D4-2-E4 with protective diode 6KE33C M Junior imer with protective diode 6KE33C J 43/92

44 On/off solenoid = LM8S roportional solenoid= L8S L M 8 S E 3 1 * * - N * * - M 1 8 G 1 2 / Load-indepen. individual operation = Load-independent parallel operation = E M 3-way function = 3 4-way function = 4 Spool function =, D, E, F, I, J, H ort spool code, 16, 25, 4, 63, 75 4), 9 = e.g. 25 1) ort spool code for 3-way valves = ** for 4-way valves, 16, 25, 4, 63, 75 4), 9 = e.g. 25 1) Without additional operator = * Manual override (with lever) = N Manual override (with rotary knob) (only operative in switch position 1) = S ttachment to connection face O port threads for line connection = * flange face for auxiliary valve = M ttachment to connection face U without (valve type E) = * without (valve type M) = * 2) with (valve type M) = K Design number ype of connection at face O flange face to factory standard = *** line connection to ports and : DIN M18 x 1.5 = M18 DIN M22 x 1.5 = M22 5) Connector socket DIN 4365 = G D4-2-E4 = M Junior imer = J Nominal voltage DC 12 V = 12 DC 24 V = 24 Variants / special features 1) Stroke limiter ( to reduce the maximum actuator flow): = /16 2) with integral compensator Q max = 25 l/min (spool types 3I or 3J) 3) only as slide funktion D and J available 4) reduces onto 25 bar 44/92

45 5.4 Directional sections, LH8S hese directional valve sections, operated by a hydraulic pilot stage, are distinguished by their slim design and their adaptability. uxiliary functions can be bolted on above or below the valve. o enable this, the appropriate interfaces must be chosen (see the following illustrations). Various manual overrides and end-stops for the spool make it possible to limit the maximum actuator flow to any desired value. LH8SE...-.**-... No facility for accepting bolt-on auxiliary valves LH8SE...-.M*-... For bolt-on auxiliary valves on connection face O uxiliary valve LH8SM...-.*K-... For bolt.on auxiliary valves on connection face U LH8SM...-.MK-... For bolt-on auxiliary valves on connection faces O and U uxiliary valve uxiliary valve uxiliary valve LH8S hydraulic operation Inlet pressure bar 315 Optional manual override for the valve spool ctuator pressure (duty cycle sec/min) bar max. 33 Spool size l/min, 16, 25, 4, 63, 75 ilot pressure bar max. 5 ilot pressure over tank pressure ccessories bar 4 to 16 (for other pilot pressures, consult ucher Hydraulics) Joystick brochure D-3 45/92

46 Maximum flow rate at directional valve (without compensator), function ctuator flow rate Q c t (l/min) Dp -> (bar) Spool size ressure drop / -> (L.8S directional valve) / -> (bar) LM8S / L8S/ LM8S D SOOL IN NEURL OSIION 4 LH8S / LM8S / L8S 2 -D SOOL IN SWICHED OSIION Inlet flow Q IN (l/min) Control characteristic (LH8SM..) 8 Q (l/min) Spool size ressure drop / (L.8S directional valve), spool at max. switched position -> / (bar) ,7,8,9 1 1,1 1,2 1,3 1,4 1,5 1,6 1,7 12V,4,5,6,7,8 24V Solenoid current l () Inlet flow Q IN (l/min) Spool types 3 3I 3J E 1 2 4F 1 2 4D 1 LH8S directional valve (without facility for bolt-on auxiliary valves) 48 18,5 37,5 M18x1,5 M18x1,5 ir-bleed point ir-bleed point ilot control port for switch position G1/4 164,5 37 G1/4 ilot control port for switch position 1 46/92

47 LH8S directional valve (with facility for bolt-on auxiliary valves) 37,5 Connection face O 28 7 Connection face U Manual override for LH8S directional valve (LH8S...-N..) Scolded position 2 ir-bleed position Manual override for LH8S directional valve and spool stroker limiter (LH8S...-N../16) Scolded position 2 ir-bleed position ilot control port for switch position /92

48 L H 8 S E 3 1 * * - N * * - 1 M 1 8 / Hydraulic operation = LH8S Load-indepen. individual operation = E Load-independent parallel operation = M 3-way function = 3 4-way function = 4 Spool function =, D, E, F, I, J ort spool code, 16, 25, 4, 63, 75 2), 9 4) = e.g. 25 1) ort spool code for 3-way valves = ** for 4-way valves, 16, 25, 4, 63, 75 2), 9 4) = e.g. 25 1) Without additional operator = * Manual override (with lever) = N ttachment to connection face O port threads for line connection = * flange face for auxiliary valve = M ttachment to connection face U without (valve type E) = * with (valve type M) = K Design number ype of connection at face O flange face to factory standard = *** line connection to ports and : DIN M18 x 1.5 = M18 DIN M22 x 1.5 = M22 3) Variants / special features 1) For different, or higher, litre ratings consult ucher Hydraulics 2) only as slide funktion D and J available 3) reduces onto 25 bar 4) only as slide funktion 4 and 4D available 48/92

49 6 uxiliary valves that bolt-on to the top connection face O 6.1 nti-shock/make-up valve (secondary pressure relief) hese bolt-on anti-shock/make-up valves are mounted on connection face O. hey protect the actuator from unacceptably-high pressure peaks. he following combinations are available in the pressure ranges listed. LU8SE-...NVO LU8SE-NVO... LU8SE-... LU8SE-...*** Directional valve Directional valve Directional valve Directional valve LU8SE-***... LU8SE-NVONVO LU8SEO-... Directional valve Directional valve Directional valve Function Model LU8SE-...NVO-.. LU8SE-NVO LU8SE LU8SE-...***-.. LU8SE-*** LU8SE-NVONVO-.. LU8SEO No function ctuator port Make-up function ctuator port nti-shock and make-up function ctuator port 1) 1) 1) Relieves into opposite line; no tank connection ressure settings available (measured at l/min test flow) bar 25, 32, 4, 5, 63, 8,, 125, 14, 16, 175, 19, 2, 23, 25, 28, 3 ressure drop bar 2 at 63 l/min ressure drop through make-up valve bar 4 at 3 l/min 49/92

50 5 25 M18x1.5 M18x L U 8 S E - 1 N V O - M 1 8 / Exit flow path of the excess pressure to opposite actuator line = O to tank = ort without pressure relief, without make-up = *** without pressure relief, with make-up = NVO with pressure relief and make-up pressure setting e.g. = 1) ort without pressure relief, without make-up = *** without pressure relief, with make-up = NVO with pressure relief and make-up pressure setting e.g. = 1) Design number ort threads DIN M18 x 1.5 = M18 Variants / special features 1) he settings (pressures) in bar available for the pressure relief function (measured at l/min test flow) 25, 32, 4, 5, 63, 8,, 125, 14, 16, 175, 19, 2, 23, 25, 28, 3 (for other pressures, contact ucher Hydraulics) 5/92

51 6.2 Lock check valves (pilot operated non return valves) hese bolt-on load check valves, with hydraulic or solenoid operation, shut off the actuator lines with zero leakage. he valves must be mounted on connection face O of the directional valve. he following variants are available. LU8SRH-DV*** LU8SRH-***DV LU8SRH-DVDV LU8SR.-DV*** Directional valve Directional valve Directional valve Directional valve LU8SR.-***DV LU8SR.-DVDV LU8SR1-ZV*** LU8SR1-***ZV Directional valve Directional valve Directional valve Directional valve LU8SR1-ZVZV Directional valve Function Hydraulic operation Solenoid operated Operating Nominal pressure flow rate Model ctuator port ctuator port max. [bar] [l/min] LU8SRH-DV*** LU8SRH-***DV LU8SRH-DVDV LU8SR1-***DV LU8SR1-DV*** LU8SR1-DVDV LU8SR1-***ZV LU8SR1-ZV*** LU8SR1-ZVZV LU8SR2-***DV LU8SR2-DV*** LU8SR2-DVDV /92

52 LU8SRH-.. Nominal flow rate l/min 63 Ratio of opening pressure to opposing pressure for double-acting cylinders 1 : ) Operating pressure bar 28 ressure drop bar 7 at 63 l/min LU8SR1-.. Nominal flow rate l/min 3 Operating pressure bar max. 2 ctuator pressure bar max. 25 ressure drop bar at 3 l/min Nominal voltage V DC 12 or 24 ower consumption Watt 27 Duty cycle % Enclosure protection I65 (DIN 45) Connector socket DIN4365 / D4-2-E4 / M LU8SR2-.. Nominal flow rate l/min 7 Operating pressure bar max. 28 ctuator pressure bar max. 315 ressure drop bar at 63 l/min Nominal voltage V DC 12 or 24 ower consumption Watt 22 Duty cycle % Enclosure protection I65 (DIN 45) Connector socket DIN ) for other opening ratios, contact ucher Hydraulics LU8SRH M18x1.5 M18x LU8SR M18x1.5 M18x /92

53 LU8SR M18 x 1.5 M18 x Connector socket lug connection to DIN 4365 Deutsch D4-2-E4 with protective diode 6KE33C M-Junior-imer with protective diode 6KE33C G J Hydraulic operation = RH Solenoid operated: Q max 3 l/min = R1 Q max 7 l/min = R2 ort without valve = *** with check valve = DV with dual seat valve = ZV ort without valve = *** with check valve = DV with dual seat valve = ZV L U 8 S R 1 - D V * * * - M 1 8 G 1 2 / Design number ort threads DIN M18 x 1.5 = M18 Connector socket DIN 4365 = G D4-2-E4 = (for R2, consult ucher Hydraulics) M Junior imer = J (for R2, consult ucher Hydraulics) Nominal voltage DC 12 V = 12 DC 24 V = 24 Variants / special features 53/92

54 6.3 Load check valves with anti-shock / make-up valve (pilot operated non-return valve with pressure relief on the actuator side) hese bolt-on load check valves with service line antishock/make-up valves shut off the actuator lines with zero leakage and protect the actuator from unacceptably-high pressure peaks. he valves must be mounted on connection face O of the directional valve. he relevant pressure settings are detailed below. Not usable for L8S.. valves and LM8S../ L8S.. valves with emergency override. Nominal flow rate l/min 7 Operating pressure bar max. 28 LU8SEC.. Directional valve ctuator pressure bar max. 315 ressure drop bar at 63 l/min ressure settings available for the pressure relief function (measured at l/min test flow) bar 25, 32, 4, 5, 63, 8,, 125, 14, 16, 175, 19, 2, 23, 25, 28, 3 Nominal voltage V DC 12 or 24 ower consumption Watt 22 Duty cycle % Enclosure protection I65 (DIN 45) M18 x 1.5 M18 x Connector socket lug connection to DIN 4365 Deutsch D4-2-E4 M-Junior-imer G J consult ucher Hydraulics consult ucher Hydraulics 54/92

55 L U 8 S E C * * * - M 1 8 G 1 2 / ort without pressure relief = *** with pressure relief and make-up pressure setting e.g. 16 = 16 1) without pressure relief, with make-up valve = NVO ort Without pressure relief = *** with pressure relief and make-up pressure setting e.g. 16 1) = 16 without pressure relief, with make-up valve = NVO Design number (to be inserted by the factory ort threads DIN M18 x 1.5 = M18 Connector socket DIN 4365 = G D4-2-E4 = 2) M Junior imer = J 2) Nominal voltage DC 12 Volt = 12 DC 24 Volt = 24 Variants / special features 1) he pressure settings in bar available for the pressure relief function (measured at l/min test flow) 25, 32, 4, 5, 63, 8,, 125, 14, 16, 175, 19, 2, 23, 25, 28, 3 (for other pressures, contact ucher Hydraulics) 2) For Deutsch and M connector plugs, consult ucher Hydraulics 55/92

56 6.4 Load control valves hese bolt-on load control valves, with integral anti-shock function, ensure load-independent lowering motion at speeds determined by the inlet flow, with leak-free shut-off when the directional valve is in its neutral position. he secondary pressure relief setting should preferably be between 1 and 2 times the highest load pressure. urning the adjusting screw in the clockwise direction reduces the setting, and this can be used for emergency lowering of the load. he valves must be mounted on connection face O. he following variants are available. Not usable for L8S.. valves and LM8S../ L8S.. valves with emergency override. LU8SH-***S Load-holding valve at port, orifice damping facility in the control line. Directional valve spool type F preferred LU8SH-... S nti-shock/make-up valve at port, load-holding valve at port. Orifice damping facility in the control line. Directional valve spool type F preferred LU8SH-S.. S Load-holding valves at ports and. Directional valve spool type D preferred LU8SH-***S.. LU8SH-...S.. LU8SH-S..S.. Directional valve Directional valve Directional valve Note: LU8SH-S..S.. cannot be combined with manual override on LM8S, L8S or L8S Inlet pressure bar max. 25 LU8SH ctuator pressure bar max. 28 LU8SH ilot ratio: S15 S23 S3 1.5 : : 1 3 : 1 nti-shock valve adjustable bar 7-28 ressure drop bar 25 bei 63 l/min 56/92

57 LU8SSH-***S.. / LU8SSH-...S.. M18x M18x Only with 36 LU8SSH-...S.. L U 8 S H - * * * S M 1 8 / =... 3) Without float position = H ort without load control = *** with load control, pilot ratio 1.5 : 1 = S15 2) 2.3 : 1 = S23 3 : 1 = S3 with pressure relief and make-up, pressure setting e.g. 2 = 2 1) ort with load control, pilot ratio 1.5 : 1 = S15 2) 2.3 : 1 = S23 3 : 1 = S3 Design number ort threads DIN M18 x 1.5 = M18 Variants / special features 1) he pressure settings in bar available for the pressure relief function (measured at l/min test flow) 25, 32, 4, 5, 63, 8,, 125, 14, 16, 175, 19, 2, 23, 25, 28, 3 (for other pressures, contact ucher Hydraulics) 2) For other pilot ratios, consult ucher Hydraulics. 3) Specify the pressure setting in bar. 57/92

58 6.5 Special bolt-on plates LU8SS-RWM12-M18 hese bolt-on plates can be fitted to all directional valves whose maximum flow rate is limited to 63 l/min. When the directional valve is in a switched position, the internal shuttle valve supplies the higher of the two actuator pressures ( or ) to port M. When the L.8S.4D... directional valve is in its neutral position, port M is also unloaded. ypical applications are using port M to release brakes, or for attaching a sensor. he valves must be mounted on connection face O of the directional valve. b a M Operating pressure bar max. 28 Nominal flow rate / to M l/min max. 8 Nominal flow rate ` to ` to l/min max. 63 ressure drop characteristic Dp [bar] 2 15 / zu M ` zu 4 Dp [bar] Q [l/min] M18x1.5 M18x M M12x1.5 58/92

59 7 uxiliary valves that bolt-on to the bottom connection face U 7.1 Individual pressure compensators with / without flow-cut-off (torque-limiting) he individual pressure compensators (2-way compensators), which bolt-on to the bottom of the directional valve, keep the p over the spool opening at a constant level, even with high inlet pressures. his means that the actuator flow remains constant and load-independent even if another actuator that needs a higher pressure is operated at the same time. here is an optional flow cut-off function at an adjustable pressure, above which level the actuator flow goes to zero. he valves must be mounted on connection face U of the directional valve. Operating pressure bar max. 315 ressure for flow cut-off Nominal flow rate LU8SSKL without flow cut-off Directional valve ` SKL/SKM SKJ/SKH LU8SSKM with flow cut-off Directional valve ` adjustable l/min max. 63 max. 1 LU8SSKH LU8SSKJ without flow cut-off with flow cut-off Directional valve ` For higher flow rates Directional valve ` Maximum flow rate at directional valve when using the LU8SSKL/SKM compensator in conjunction with an LU8SSCS inlet section 8 Flow cut-off function in conjunction with an LU8SSKM/SKJ bottom-mounting plate 7 ctuator flow rate Q (l/min) Inlet flow (l/min) Spool size ctuator flow rate Q (l/min) p (bar) 3 Maximum flow rate at directional valve when using the LU8SSKH/SKJ compensator in conjunction with an LU8SSCS inlet section ctuator flow rate Q (l/min) Spool size Inlet flow (l/min) 14 59/92

60 LU8SSKL 177 LU8SSKM LU8SSKH 182 LU8SSKJ L U 8 S S K L - / =... Without flow cut-off, with check valve = SKL With flow cut-off, with check valve = SKM Without flow cut-off, without check valve = SKH With flow cut-off, without check valve = SKJ Design number Variants / special features 1) Specify the flow cut-off setting in bar (only with SKM/SKJ). 6/92

61 7.2 Flow limiters with / without individual pressure compensators Optionally, this function can be combined with an individual pressure compensator for independent parallel operation, and also with a flow cut-off function. he valves must be mounted on connection face U of the directional valve. hese flow limiters, which bolt-on to the bottom of the directional valve, are another metering orifice in addition to the one in the spool in the directional valve. his means that the usual flow rate, which is determined by the size of the spool, can be reduced or limited to any desired level by means of a small hand wheel. his plate can not be combined with the manual override design on the L8S/LM8S valves. here are also potential space problems involving the solenoid connector plug in the combination of LD8S/LC8S valves with bolt-on plates (e.g. LU8SH-S..S..). For this reason, planned combinations should be tested for compatibility. Operating pressure bar max. 315 Flow rate l/min max. 63 ressure for flow cut-off adjustable LU8SSDR LU8SSKR LU8SSKS Directional valve Directional valve Directional valve ` ` ` Flow rate calibration - LU8SSDR Flow rate calibration - LU8SSKR Flow rate (l/min) Spool size Flow rate (l/min) Spool size urns urns Flow cut-off function in conjunction with an LU8SSKS bottom-mounting plate ctuator flow rate Q (l/min) p (bar) 3 61/92

62 LU8SSDR LU8SSKR/SKSh Only with LU8SSKS L U 8 S S D R - / =... Without 2-way compensator = SDR With 2-way compensator, without flow cut-off = SKR With 2-way compensator, with flow cut-off = SKS Design number Variants / special features 1) Specify the flow cut-off setting in bar (only with SKS). 62/92

63 7.3 ressure reducing compensators hese pressure-reducing compensators, which bolt-on to the bottom of the directional valve, can be switched between the individual compensator and 3-way pressure reducing functions. y energising solenoid Y, the valves is switched into individual-compensator mode. In pressurereducing mode, preselection of the appropriate actuator line allows a preset pressure to act at port or. he pressure setting can be altered by hand or by electro-proportional solenoid. he valves must be mounted on connection face U of the directional valve. he following combinations are available. LU8SSDK (manual adjustment) LU8SSDK (electro-proportional) LU8SSDO (electro-proportional) LU8SSDO (manual adjustment) X X M Y ` M Y ` M ` M ` Model Changeover from pressure control to flow control Manual ressure setting Electro-proportional LU8SSDK pressure ranges 1 to 4 LU8SSDK pressure ranges 6 to 8 LU8SSDO pressure ranges 1 to 4 only pressure control LU8SSDO pressure ranges 6 to 8 only pressure control ressure ranges 1-4 (electro-proportional) ressure range Operating pressure bar max. 25 Minimum pressure always bar 15 above tank pressure Nominal flow rate l/min max. 25 Solenoid voltage V DC 12 or 24 ower consumption Solenoid X Solenoid Y Duty cycle % at I max. 1.4 (U N 12V).7 (U N 24V) Enclosure protection I65 (DIN 45) bar Watt /92

64 ressure ranges 6-8 (manual adjustment) ressure range Operating pressure bar max. 25 Minimum pressure always bar 15 above tank pressure Nominal flow rate l/min max. 25 Nominal voltage V DC 12 or 24 ower consumption Watt 27 Duty cycle % at I max. 1.4 (U N 12V).7 (U N 24V) Enclosure protection I65 (DIN 45) bar ressure control characteristic with proportional control of solenoid X p (bar) ressure range (bar),2,4,6,8 1 1,2 1,4 12V,1,2,3,4,5,6,7 24V Solenoid current I () ressure ranges 1-4 Only with LU8SSDK Y est point Mx1 ressure ranges 6-8 Only with LU8SSDK est point Mx1 64/92

65 Connector socket lug connection to DIN 4365 G Deutsch D4-2-E4 M-Junior-imer J Consult ucher Hydraulics Consult ucher Hydraulics L U 8 S S D K 1-1 G 1 2 / rop. press. control vv., switchable to 2-way compensator roportional pressure control valve, not switchable = SDK = SDO roportional pressure control ranges electro-proportional 63 bar = 1 bar = 2 16 bar = 3 23 bar = 4 manual bar = 6 16 bar = 7 25 bar = 8 Design number Connector socket 1) DIN 4365 = G D4-2-E4 = 2) M Junior imer = J 2) Nominal voltage 1) DC 12 V = 12 DC 24 V = 24 Variants / special features 1) Omit for LU8SSDO with manually adjustable pressure control. 2) For Deutsch and M connector sockets, consult ucher Hydraulics 65/92

66 7.4 2-way compensator he individual pressure compensators (2-way compensators), which bolt-on to the bottom of the directional valve, keep the p over the spool opening at a constant level, even with high inlet pressures. his means that the actuator flow remains constant and load-independent even if another actuator is operated at the same time. LU8SSKU - G... Electrically switchable to two pressure values for flow cut off. LU8SSKU Inlet pressure bar max. 25 Nominal flow rate l/min max. 63 ressure for flow cut-off adjustable Nominal voltage V DC 12 oder 24 Flow cut-off Q (l/min) p - (bar) , L U 8 S S K U - G 2 4 =... 1) with flow cut-.off second lower cut-off pressure can be activated = SKU Design number Nominal voltage DC 12 Volt = G12 DC 24 Volt = G24 1) Specify the second, lower flow cut-off setting in bear. 66/92

67 8 End sections 8.1 End sections with no control function End sections with no control function are intended for the end of a valve block when no other control functions are needed. he signal is unloaded to tank. he ports needed for the particular model are provided, as are tapped holes for securing the valve block. ype LU8SWS also carries the signal outside the valve for further use. o prevent malfunctions, the signal must always be used somewhere. Do not plug the line. Model LU8SU and LU8SWS: he upper tank gallery is not connected to the tank port. he lower tank galleries are not connected to the tank port. LU8SU LU8SU LU8SWS LU8SU LU8SU 69,5 19,5 M22x1,5 2, Minimum length for calculating the total tie bolt length 2,5 38,5 48, LU8SU ,5 M8 6,5 Minimum length for calculating the total tie bolt length 18,5 28,5 6 33,5 1 67/92

68 LU8SU 2 M22x1, Minimum length for calculating the total tie bolt length 2,5 3,5 33,5 M22x1, ,5 11, LU8SWS M14x1,5 2, Minimum length for calculating the total tie bolt length 2,5 38,5 4 5 M22x1, L U 8 S U - M 2 2 / With port = U Without ports = U With and ports = U With and ports = WS Design number ort threads DIN M 22 x 1.5 = M22 DIN M 26 x 1.5 = M26 1) without port threads = *** Variants / special features 1) only with LU8SU: tank port M 26 x 1.5, pressure port M 22 x /92

69 8.2 riority sections LU8SU Intended for the end of a valve block, the LU8SUO/U... priority section includes a priority function for the external control system supplied by the ports and, and a surplus flow side. In the under-supply range (pump flow < total flow needed by the valve block), the surplus flow side will receive only a portion of what it needs, or possibly (pump flow < priority flow setting) no flow whatsoever. he priority side can also be equipped with a pressure relief valve that ensures a priority flow cut-off when the pressure setting is reached. For oscillation-prone applications, a damping element (e.g. an accumulator) can be connected to a port specially provided for this purpose. referred applications are in systems. LU8SUO LU8SU M riorität M riorität Rest Rest Inlet pressure bar max. 315 Nominal flow rate l/min max. 15 Control p for the compensator bar 12 ressure for flow cut-off on the priority side bar adjustable ressure drop characteristic = ump port to Surp (Q riority =zero) at Surp = = ump port to Surp at Dp Surp to > 2 bar C = ump port to riority (control spool in neutral position) Flow cut-off on the priority side 16 Dp [bar] , C Q [l/min] 12 Q [l/min] p (bar) 69/92

70 M14 x 1.5 M14 x 1.5 M26 x M22 x 1.5 M Connection point for damping element M14x Screw-in depths for calculating the total tie bolt length (3.5) L U 8 S U - 1 / =... 1) Without flow cut-off = O With flow cut-off = Design number ort threads DIN M 26 x 1.5 = M26 S 1 / G 1 = Variants / special features 1) Specify the flow cut-off setting in bar. 7/92

71 8.3 With direct-acting pressure relief For terminating the block with integral direct-acting pressure relief (e.g. secondary pressure relief in systems). he application limits must not be exceeded. test point for, and tapped holes for securing the valve block are provided. LU8SUD M Inlet pressure bar max. 315 Flow rate l/min see diagram ressure range bar ressure relief characteristic 35 p (bar) pplication limit Q (l/min) , M8 2,5 2 68,5 13 M14x1, Minimum length for calculating the total tie bolt length L U 8 S U D 1 - M 1 4 / =... 1) ressure range bar = bar = bar = 3 Design number ort threads DIN M 14 x 1.5 = M14 (test point) Variants / special features 1) Specify the pressure relief setting in bar. 71/92

72 8.4 With pressure reducing function e.g. for hydraulic joystick his end section includes a pressure reducing valve and the ports X and X. he reduced pressure available at port X can be varied by the adjusting screw to any required level from to bar. typical application is providing the supply for hydraulic joysticks. No tank unload facility at the upper tie bolt gallery. he upper tank gallery is not connected to the tank port. LU8SUH X Operating pressure bar max. 25 Flow rate at port X l/min max. 15 Reduced pressure at X preset bar 5 X Reduced pressure at X adjustable bar max X ir-bleed screw G1/ X G1/4 Minimum length for calculating the total tie bolt length ,5 djusting screw M L U 8 S U H / Design number ort threads S 1/4 / G 1/4 = 14 Variants / special features 72/92

73 8.5 Load control valve with float position For terminating the block, this has an integral load-holding valve with anti-shock function for port and two seat valves in and to create the float position. When the directional valve is in the neutral position, actuator line is shut-off with zero leakage and protected from unacceptably-high pressure peaks by an anti-shock function. he mating directional valve is the last directional section in the block and must be a special version e.g. L.8S.../24, with spool type E. typical application is the arm function in wheel loaders and front loaders. LU8SUE Inlet pressure bar max. 2 ctuator pressure l/min max. 25 ilot ratio S15 S3 1.5 : 1 3 : 1 nti-shock valve adjustable bar - 25 ressure drop across load-control function bar 3 at 63 l/min Nominal voltage V DC 12 or 24 ower consumption Watt 5 Duty cycle % Enclosure protection I65 (DIN 45) M18x M M22x1.5 Minimum length for calculating the total tie bolt length 73/92

74 Connector socket lug connection for DIN 4365 Deutsch D4-2-E4 with protective doide 6KE33C M-Junior-imer with protective diode 6KE33C G J ort with load control valve, pilot ratio 1.5 : 1 = S15 1) 3 : 1 = S3 ort without load control valve = *** Design number (t o be inserted by the factory) ort threads DIN M 18 x 1.5 = M18 Connector socket DIN 4365 = G D4-2-E4 = M Junior imer = J L U 8 S U E - S 1 5 * * * - M 1 8 G 1 2 /... 2) Nominal voltage DC 12 V = 12 DC 24 V = 24 Variants / special features 1) For other pilot ratios, contact ucher Hydraulics 2) Specify the pressure relief setting in bar 74/92

75 8.6 Intermediate and end section with flow control function SR Intermediate section Intermediate section with integral flow-control valves for load-independent operation of two actuators. Via the signal, this section can be combined with all types of pressure compensators and pump systems. ypical applications are motorised drives. LU8SSZ-SR End section End section with integral flow-control valves for loadindependent operation of an actuator. Via the signal, this section can be combined with all types of pressure compensators and pump systems. ypical applications are motorised drives. LU8SSU-SR... Operating pressure bar max. 315 Nominal flow rate I/min, 16, 25, 32, 4, 5, 63 1) Leakage l/min max. cm 3 /min for bar inlet pressure Min. ressure difference (pressure compensator) Control accuray Load-dependency when under pressure Hysteresis when operated bar 7 (as a % of the nominal flow) max. 2,5% 3,5% Nominal voltage V DC 12 bzw. 24 ower consumption Watt 27,6 Dither frequency required Hz 5-15 Duty cycle % rotection class DIN plug - I65 (DIN 45) M Junior imer plug connector - I65 Deutsch plug - D4-2-E4 Electrical connection lug-base with pins to DIN 4365 M-Junior imer plug connector Deutsch plug D4-2-E4 75/92

76 Q max Q Nenn Q (%) 5 25 Q (l/min) V V I (m]) p (bar) LU8SSZ-SR ,5 29, LU8SSU-SR... M14x1,5 26, M8 M18x1, Minimum width for calculating the total tie bolt lenght M18x1,5 79,5 76/92

77 L U 8 S S Z - S R S 2 - M 2 2 G 1 2 Intermediate section LU8SSZ End section LU8SSU Flow control valve SR Constant flow range, 16, 25, 32, 4, 5, 63 l/min = 25 Constant flow range, 16, 25, 32, 4, 5, 63 l/min = 16 ype of operator solenoid + emergency pin = S solenoid + basic manual override = N solenoid + deluxe manual override = 2- or 3-way-function = 2 Design number (wird vom Werk eingesetzt) ort threads DIN M 18 x 1,5 = M18 lug connector DIN 4365 = G D4-2-E4 = M-Junior-imer = J roportional solenoid supply voltage DC 12 Volt = 12 DC 24 Volt = 24 1) For higher litre ratings consult ucher Hydraulics 77/92

78 9 Combinations with other valve series 9.1 Combination with SVH4.. In this combination, a preselector valve (LD, LM, L, etc.) is normally employed. his directional stage determines the direction of flow, and the flow rate. o define the required interface, the special feature code e.g. /2 is added to the respective valve. For the application limits and dimensions of the SVH4.. series, please refer to brochure --43-E-3. he maximum system pressure is 2 bar, which also applies to the tank line. Monoblock flange-mounted on an L.8S series valve block 3 x cap screws 2 x plug screws SVH4M218SN-M12G12 X = 2 SVH4M8SN-M12G12 LD8SE4D2525-***-M18G12/2 =...l/min, =...l/min b a Internal preselector valve L8SE4D44-***-M18G12 b a LU8SSCK-M22/4 LU8S2U13 78/92

79 9.2 Combination with HDS7 with unload function In addition to integral functions, these intermediate sections have the LU8S mating interface on one side and the HDS7/HDS11 interface on the other side. his allows the two valve series to be combined in one valve block. LU8SSU-M22/18 3-way compensator function for series L.8S and HDS7 valves. he flow rate for the HDS7 side can be set by an adjusting screw. here is also a 2-stage pressure relief valve that is adjustable from outside the valve. LU8SSL-M22/18 3-way compensator function for series L.8S and HDS7 valves. he flow rate for the HDS7 side can be set by an adjusting screw. here is also a 2-stage pressure relief valve (only functional in open systems) that is adjustable from outside the valve. he valve also has the facility to change over to or constant-pressure systems. his is typical with towed harvesters. LU8SSK-M22/18 3-way compensator function for series L.8S and HDS7 valves. he flow rate for the HDS7 side can be set by an adjusting screw. he valve also has the facility to change over to or constant-pressure systems. his is typical with towed harvesters. L.8S L.8S HDS7 L.8S HDS7 HDS7 Inlet pressure bar 25 Unloaded pressure -> bar to 16 Nominal flow rate l/min 12 Max. flow rate, HDS7 valve l/min 25 Unloaded pressure see performance graph ressure relief adjustable hreaded port / M22 x 1.5 DIN 3852 hreaded port M14 x 1.5 DIN /92

80 ressure relief characteristic 3 25 Unload pressure in neutral position (bar) (bar) HDS7SC../HDS7SK/LU8SS.../ Inlet flow Q IN (l/min) Inlet flow Q IN (l/min) Only with LU8SSK M14 x 1.5 M22 x 1.5 M22 x Only with LU8SSU M With system pressure relief, two-stage = SU With two-stage pressure relief, with changeover facility = SL Without pressure relief, with changeover facility = SK L U 8 S S U - M 2 2 / 1 8 =... 1) Design number ort threads DIN M22 x 1.5 = M22 Variants / special features 1) Specify the system pressure relief setting in bar. 8/92

81 9.3 Combination with HDS7 with proirity function In addition to integral functions, these intermediate sections have the LU8S mating interface on one side and the HDS7/HDS11 interface on the other side. his allows the two valve series to be combined in one valve block. LU8SSMD-M22/22 HDS7 riority function for HDS7 valves whose total flow rate can be set by means of an orifice. he priority-flow is provided with a flow cut-off function. he surplus flow is available for L.8S series valves and load-independent control is provided by a 3-way compensator. he 2-stage pressure relief for the surplus flow, and the flow cut-off for the priority flow are both adjustable from outside the valve. 1 2 L.8S LU8SSMF-M22/22 HDS7 riority function for HDS7 valves whose total flow rate can be set by means of an orifice. he priority-flow is provided with a flow cut-off function. he surplus flow is available for L.8S series valves and load-independent control is provided by a 3-way compensator. he valve also has the facility to change over to or constant-pressure systems. his is typical with towed harvesters. L.8S Inlet pressure bar 25 Unloaded pressure bar to 2 Nominal flow rate l/min 12 Max. flow rate, HDS7 valves l/min 25 Unloaded pressure ressure relief see performance graph adjustable hreaded port / M22 x 1.5 DIN 3852 hreaded port M14 x 1.5 DIN /92

82 ressure relief characteristic (bar) Inlet flow Q IN (l/min) Unload pressure in neutral position (bar) 2 LU8SSM.-M22/ Inlet flow Q IN (l/min) Dimensions LU8SSMF-M22/ Only with LU8SSMF M8 2 M14x1.5 M22x1.5 M22x1.5 Only with LU8SSMD L U 8 S S M D - M 2 2 / 2 2 =... 1) riority and Surp with pressure relief = SMD 2) riority with pressure relief, Surp with changeover facility = SMF Design number ort threads DIN M22 x 1.5 = M22 Variants / special features 1) Specify the pressure relief setting in bar. 2) Flow cut-off priority side 1=, pressure relief surplus-flow side 2= 82/92

83 9.4 Combinations with HDS7 In addition to integral functions, these intermediate sections have the LU8S mating interface on one side and the HDS7/HDS11 interface on the other side. his allows the two valve series to be combined in one valve block. LU8S-HDS7-S- HDS7 For combining HDS7 and L.8S directional valves. he flow rate for the HDS7 side can be set by an adjusting screw. L.8S Inlet pressure bar 25 djustment range, flow to HDS7 side l/min 1 to 25 Nominal flow rate l/min 25 LU8S-HDS7-S M /92