1 LS unloading (control valve, orifice, none) 2 LS max pressure relief. 3 Spool type

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1 Flow Control Valve Series LVM.. high flow rates (8 l/min) flow rates are unaffected by temperature change or when the higher load pressure alternates between the outlet ports proportional flow-sharing principle easy to service reliable safe Description. General description Series LVM flow-control valves are used to set the speed of single-acting hydraulic actuators. The flow rate is set by the proportional or mechanical displacement of the control spool. The integral downstream pressure compensator makes it possible to design systems that work on the principle of proportional flow-sharing (see Section 7, Circuit examples). There are 3 versions of the flow-control valve... Load sensing (LS) pumps without -way pressure compensator The Δp created by the LS pump determines the flow to the actuator. The LS pressure is safeguarded by the integral LS max pressure relief function... Load sensing (LS) pumps with -way pressure compensator The flow-control valve works with a control Δp of bar. The integral LS max pressure relief limits the LS pressure. If it is activated, the -way pressure compensator cuts off the flow to the actuator, which then allows higher pressures to be developed in the hydraulic system...3 Fixed-displacement pumps with integral 3-way pressure compensator The flow that is not required is routed directly to tank.. pplication examples Harvesters Sweepers Construction equipment Chippers/Shredders Municipal vehicles sphalt pavers Reference: -P-6-EN- Issue: 5.6 /

2 Symbols. For load sensing pumps without -way pressure compensator (LVMW...) T X. For load sensing pumps with -way pressure compensator (LVMC...) X P T P.3 For fixed-displacement pumps with integral 3-way pressure compensator (LVM3C...) x MT T X x.4 Versions 3 T P T P D P x MP LS unloading (control valve, orifice, none) LS max pressure relief 3 Spool type 3 Technical data IMPORTNT: Values refer to an oil viscosity of 35 mm /s [cst]. For others viscosities, please contact Bucher Hydraulics. General characteristics Unit Description, value Design Seals Operation Mounting attitude Monoblock NBR (Nitrile Butadiene rubber) Two-stage electrohydraulic, mechanical operation unrestricted Electrical characteristics Unit Description, value Design Proportional solenoid Supply voltage V DC or 4 from an electronic controller / -P-6-EN-/5.6

3 Electrical characteristics Unit Description, value Power consumption W max. 8 (at.5 and V, or.75 and 4V) Dither frequency required Hz Relative duty cycle at I max % Protection class (with a properly-fitted plug) Electrical connection MP Junior Timer - IP65; Deutsch plug - IP67 MP Junior Timer plug connector (-pole); Deutsch plug DT4-P-EP4 Hydraulic characteristics Unit Description, value Controlled-flow range l/min 4, 5, 63, 8,, 5, 5 and 8 Nominal inlet flow, 3-way function l/min max. 8 Nominal inlet flow, -way function l/min max. Maximum pressure at the inlet "P" bar max. 8 Maximum pressure at the outlet "T" bar 5 static optional Maximum pressure at the actuator ports bar max. 3 Fluid mineral oil to DIN 554 Fluid temperature range C (but comply with the viscosity limits) Viscosity range mm /s permitted: ideal:... 8 Minimum fluid cleanliness level NS 638, class 9 or ISO 446 code /8/5 3. Pilot head Electrohydraulic, standard model Electrohydraulic with horizontal solenoid Mechanical operation M = -3 Nm 3. Connector socket MP Junior Timer Deutsch plug -P-6-EN-/5.6 3/

4 4 Performance graphs Values refer to an oil viscosity of 35 mm /s [cst]. 4. Control characteristics Electrohydraulically operated valve with bar pressure drop at the orifice. Q [l/min] = flow rate at the actuator port, I [m] = current at the solenoid 4.. Flow characteristic LVMW 4.. Flow characteristic LVMC Q [l/min] Q [l/min] I [m] V I [m] 4V I [m] V I [m] 4V 4..3 Flow characteristic LVM3C 8 8 Q [l/min] I [m] V I [m] 4V 4. Unloaded bypass 4.. LVM3C Control Δp 9 bar Control Δp bar (standard) Δp_P -> T [bar] Control Δp 8 bar Q ZU [l/min] 4/ -P-6-EN-/5.6

5 4.3 Load characteristic 4.3. LVMW 4.3. LVMC Q [l/min] Q [l/min] p [bar] p [bar] LVM3C Q [l/min] 5 5 p [bar] Q - constant flow is pressurised ctuator pressure relief / flow cut-off bar -P-6-EN-/5.6 5/

6 5 Dimensions 5. Load sensing pumps without two-way pressure compensator (LVMW ) 5. Load sensing pumps with two-way pressure compensator (LVMC ) M8x5/ Mx5/ Legend Model with pressure relief function Model with electrohydraulic operation (standard) 6/ -P-6-EN-/5.6

7 5.3 Fixed-displacement pump with integral 3-way pressure compensator (LVM3C...) Mx5/ Legend Model with pressure relief function Model with electrohydraulic operation (standard) -P-6-EN-/5.6 7/

8 6 Ordering code L V M W E 5 4 F J G * C / P Flow-control valve without -way press. comp. =W with -way press. comp. =C with 3-way press. comp. =3C Control Δp for compensator (C, 3C) Cont. Δp 9 bar (reduced) = E Cont. Δp bar (standard) = * Cont. Δp 8 bar (raised) = H Maximum controlled flow 4 l/min = 4 5 l/min = 5 63 l/min = 63 8 l/min = 63 l/min = 5 l/min = 5 5 l/min = 5 8 l/min = 8 Spool type (see chapter.4) In - position closed in - position open = = D Pressure compensator (load sensing) Standard = 4 Damped = 6 Fine control = B Load sensing unloading with LS unloading control = without LS unloading control = * LS unloading orifice,4 = 4 LS unloading orifice,5 = 5 LS unloading orifice,6 = 6 LS unloading orifice,7 = 7 LS unloading orifice,8 = 8 Pilot head Prop. electrohyd. V (standard) = F Prop. electrohyd. 4 V (standard) = G Prop. electrohyd. V (horizontal) = T Prop. electrohyd. 4 V (horizontal) = U Mechanical operation = M P = pressure setting in plain text -way = LS max 3-way = P max Design (to be inserted by the factory) Option (to be inserted by the factory) Manual override Without = * Override pin = Mechanical operation = N Port threads to DIN Part or ISO 96 -way compensator (W, C) P and G3/4 X (LS) and T G/4 = G P and G X (LS) and T G ¼ = G 3-way compensator (3C) P and G3/4 X (LS) G/4 T G = G P, T and G X (LS) G/4 = G LS max pressure relief with LS max pressure relief = without = * Solenoid connector socket MP Junior-Timer = J Deutsch DT4-P-EP4 = T With mechanical operation = * 6. ccessories Description Type Order-No. Data sheet Plug for MP Junior Timer with metres of cable Plug for Deutsch DT4-P-EP4 with metres of cable Plug, Junior Timer, -pin Deutsch DT4-4P-CE / -P-6-EN-/5.6

9 6. Electronics For controlling LVM flow-control valves, we recommend the ELSK6 series of control units and plug-in cards. These are used to control or proportional solenoids and can also operate on/off solenoids and other auxiliary functions. Plug-in cards are available and fully customised control units can be supplied. The following table contains a small selection of the extensive range of accessories and electronics from Bucher Hydraulics. Type Description Order-No. ELSK6-9*** with screw terminals 879 ELSK6-8*** with screw terminals, encapsulated 879 ELSK6-8***/ with screw terminals, encapsulated, with ramp s 3454 ELSK6-8***/4 with screw terminals, encapsulated, with ramp 4s 679 ESSK7 ELSK6 Multifunction card for controlling one proportional flowcontrol valve ( axis) and one on/off valve (e.g. seat valve) Multifunction card for controlling one proportional flowcontrol valve ( axis) and one on/off valve (e.g. seat valve) See data sheet -P-733 See data sheet -P Examples of control units ELSK 6 controller Description Proportional amplifier module; front plate and indicator knob ELSK 6-***/ controller Description Makrolon housing with rotary potentiometer, indicator knob, LED and magnetic clamp ELSK 6-***/ controller Description Makrolon housing with rotary potentiometer, indicator knob, ON/OFF switch, LED and magnetic clamp EBT control unit Description The control unit consists of a solid aluminium enclosure with impact-resistant plastic covers (IP65). The user-friendly operating interface can be customised. The example shown is fitted with rotary potentiometer (current output for proportional solenoid), 4 switches (detented or momentary), ON/ OFF switch. -P-6-EN-/5.6 9/

10 Proportional amplifier EBM 338-DS-MOBI Description The EBM-338-DS-MOBI proportional amplifier is used for controlling three proportional directional valves (three axes / six solenoids) or two proportional directional valves and one directional seat valve. The three axes can be controlled independently of one other. The current-compensation feature ensures that the output current is unaffected by fluctuations in the coil temperature or supply voltage. 7 Circuit examples 7. Circuit example of flow-control valve with -way pressure compensator Constant-pressure supply Flow cut-off for belt-drive motor Load-independent drives using proportional flow-sharing Belt motor Belt motor X X T P max = 3 bar T Flow-control valve with -way compensator, with LS unloading and LS pressure relief: LVMC*84FJGC/P3 Flow-control valve with -way compensator, without LS unloading or LS pressure relief: LVMC*54*FJ*GC / -P-6-EN-/5.6

11 7. Circuit example of flow-control valve without -way pressure compensator Supply from LS variable-displacement pump Load-independent drives using proportional flow-sharing LS max pressure relief effective for all actuators Belt motor Belt motor Belt motor 3 T X T X T X P max = bar Flow-control valve without -way compensator, with LS unloading and LS pressure relief: LVMW*54FJGC/P Flow-control valve without -way compensator, and without LS unloading or LS pressure relief: LVMW*54*FJ*GC 7.3 Circuit example of flow-control valve with 3-way pressure compensator Supply from fixed-displacement pump Load-independent supply of the actuators, using proportional flow-sharing LS max pressure relief effective for all actuators Belt motor Belt motor Belt motor 3 T X MT T X T X P max = bar Flow-control valve with 3-way compensator, with LS unloading and LS pressure relief: LVM3C*D4FJGC/P Flow-control valve without -way compensator, and without LS unloading or LS pressure relief: LVMW*54*FJ*GC -P-6-EN-/5.6 /

12 8 Fluid Flow-control valves require fluid with a minimum cleanliness level of NS 638, class 9 or ISO 446 code /8/5. We recommend the use of fluids that contain anti-wear additives for operation with boundary lubrication. Fluids without appropriate additives reduce the service life of the valves. The user is responsible for maintaining and regularly checking of the fluid quality. Bucher Hydraulics recommends a load capacity of > 3 N/mm to Brugger EN/ DIN Note This catalogue is intended for users with specialist knowledge. The user must check the suitability of the equipment described here in order to ensure that all of the conditions necessary for the safety and proper functioning of the system are fulfilled. If you have any doubts or questions concerning the use of these valves, please consult Bucher Hydraulics GmbH. Fluid cleanliness Cleanliness class to ISO 446 and NS 638 Code ISO 446 Number of particles / ml 4 m 6 m 4 m NS 638 3//8 8 5 // //7 4 3 // /9/ /8/ /7/ /6/ /5/ /4/ /4/ /3/ // //8 8 5 info.kl@bucherhydraulics.com 6 by Bucher Hydraulics GmbH, D-7977 Klettgau ll rights reserved. Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual improvement, we reserve the right to amend the product specifications contained in this catalogue. Classification: / -P-6-EN-/5.6

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