DPC Series Pre-compensated Load Sensing Sectional Valves

Transcription

1 DC Series re-compensated Load Sensing Sectional Valves

2 DC Series dditional information his catalogue shows the product in the most standard configurations. lease contact Sales Dpt. for more detailed information or special request. WRNING! ll specifications of this catalogue refer to the standard product at this date. Walvoil, oriented to a continuous improvement, reserves the right to discontinue, modify or revise the specifications, without notice. WLVOIL IS NO RESONSILE FOR NY DMGE CUSED Y N INCORREC USE OF HE RODUC. 7 th edition June 7 DWWEDE

3 DC Series General information he DC Series he DC Series is a family of open/closed center pre-pressure compensated sectional valves designed specifically for Mobile pplications. he DC series provides exceptional controllability, efficiency and flexibility for applications requiring up to 4 l/min (6.4 US gpm) flow rate. DC Series is available in two different sizes: DC (DC) and DC. DC DC DC he Load Sensing technology hanks to the use of specially designed pumps and control valves, the Load Sensing principle can be considered the most comprehensive means of creating a flexible hydraulic circuit that can adapt to the various operating conditions demanded by users. he main feature of this principle is that the flow rate to the user is proportional to the spool position under any operating condition, regardless of the resistance encountered by the user (pressure) and the number of levers activated (exceeding the pump s total flow rate, a condition here in after defined as saturation, is the only limitation). herefore, with the LS systems, there is a specific correspondence between the position of the control lever and the movement speed of the user, cylinder or hydraulic motor. his feature is particularly useful in the hydraulic handling machine sector (excavators, cranes, loaders, agricultural and forestry machinery) in which each movement phase has specific sequences that the operator must control by using memorised movements. dvantages and options Energy saving. Extension of part service life. Lower energy dissipation. Noise reduction. vailable to create a single-pump circuit (compared with the use of multiple-pump circuits in which each pump is dedicated to different actuators to be operated simultaneously). Real energy savings can be obtained above all when the DC directional valves operate together with variable displacement Load Sensing pumps. When the DC valve is utilised with fixed displacement pumps, the previously mentioned movement independence and repeatability features are guaranteed, but energy savings will be limited. For special options please contact Sales Dept. he E version he DC is the DC Series new valve built according to the E directive for safe use in classified areas, with inflammable and potentially explosive materials. Hydraulic features and performance remain the same of the DC standard valve. For more informations see code DWWEDE catalogue. DWWEDE

4 General information DC Series Working conditions his catalogue shows technical specifications and diagrams measured with mineral oil of 46 mm /s - 46 cst viscosity at 4 C - 4 F temperature. Nominal flow rating (open center circuit) Max. pressure ack pressure (max.) Standard internal leakage ()-> Fluid Fluid temperature range DC DC on inlet port with stand-by (margin 5 l/min US gpm 6 l/min US gpm 9 bar - bar - 67 ps on working ports with compensator (Qin/Qut>%) l/min US gpm l/min US stand-by (margin 7 bar - 7 bar - ps on working ports without compensator (Qin/Qut>%) l/min - 4.US gpm 4 l/min US stand-by (margin 9 bar - bar - 67 ps inlet port 5 bar ( ) - 45 psi ( ) 5 bar ( ) - 5 psi ( ) and working ports 5 bar ( ) - 45 psi ( ) 4 bar ( ) - 6 psi ( ) on outlet port 5 bar - 6 psi 5 bar - 6 psi on L drain port.5 bar - 6 psi.5 bar - 6 psi p= bar - 45 psi 6 cm /min -.98 in /min cm /min -. in /min with port valves, p= bar - 45 psi cm /min -.8 in /min 5 cm /min -.5 in /min Mineral oil with seals NR (UN-N) from - C to 8 C - from -4 F to 76 F with seals FM (VION) from - C to C - from -4 F to F Viscosity operating range min. max. from 5 to 75 mm /s - from 5 to 75 cst mm /s - cst 4 mm /s - 4 cst Contamination level max. -/8/5 - ISO NS 68 class 9 with mechanical devices from -4 C to 6 C - from -4 F to 4 F Environmental temperature with hydraulic/pneumatic devices for working conditions from - C to 6 C - from - F to 4 F with electric/electrohydraulic devices from - C to 5 C - from -4 F to F NOES: ( ) ccording to NF.6.., fatigue rating verified for million cycles on 6 sample valves with test ressure =. x Max. pressure indicated - ( ) ccording to NF.6.., fatigue rating verified for million cycles on 8 sample valves with test ressure =.4 x Max. pressure indicated. 4 DWWEDE

5 DC Series General information Standard threads REFERENCE SNDRD S UN-UNF NF Flange connection HRED ISO 8/ ISO 6 ISO 66 NSI.. CCORDING O S 779 NSI. unified SE J58 CVIY ISO DIMENSION SE J96 J476a SE J58 code 6 ( ) CCORDING O DIN 85-, or Y shape ISO 66- ( 4 ) NOES ( ): Standard pressure series - ( 4 ): For pressure up to 5 bar (5 psi) DC DC ORS HREDING S UN-UNF S UN-UNF Flange connection (bolts threading) ISO 66- type SE J58 code 6 inlet G /4 /6- (SE ) G 5/6- (SE 6) DN 9 (M) /4 (/8-6 UNC) and ports G / 7/8-4 (SE) G 5/6- (SE 6) DN 9 (M) /4 (/8-6 UNC) outlet G /4 /6- (SE ) G -/4 5/8- (SE ) DN 5 (M) (/8-6 UNC) LS Load Sensing G /4 9/6-8 (SE 6) G /4 9/6-8 (SE 6) V pilot G /4 9/6-8 (SE 6) G /4 9/6-8 (SE 6) depends on inlet section type: V pilot M4x.5 ( see pages from 4 to 7 ( 5 ) 5 ) L drain G /4 7/6- (SE 4) G /4 7/6- (SE 4) M pressure gauge G /4 9/6-8 (SE 6) G /4 9/6-8 (SE 6) Hydraulic control ports G /4 9/6-8 (SE 6) G /4 9/6-8 (SE 6) NOES ( 5 ): ENION! V pilot port requires dedicated joints; please see Inlet section pages. see S threading see UN-UNF threading DWWEDE 5

6 Index DC Series Contents DC Dimensional data and performance... page 8 Hydraulic circuit...9 Complete section ordering codes... Inlet section Inlet section part ordering codes... page Dimensions and hydraulic circuit... 4 L.S. pressure relief valves... Solenoid operated L.S. unloading valve... Solenoid operated Shut-Off pilot valve Working section Working section part ordering codes... page Dimensions and hydraulic circuit... 6 Standard spools and spools for independent drain... 8 ressure control spools... 4 "" side spool control kit... 8 Electrohydraulic controls... 4 "" side spool control kit ort valves L.S. port relief valves On/off solenoid operated L.S. unloading valve roportional solenoid operated L.S. unloading valve Outlet section Outlet section part ordering codes... page 49 Dimensions and hydraulic circuit... 5 Drain options... 5 DC Dimensional data and performance... page 5 Hydraulic circuit... 5 Complete section ordering codes Inlet section Inlet section part ordering codes... page 56 Dimensions and hydraulic circuit ressure reducing valve... 6 Solenoid operated unloading valve... 6 L.S. pressure relief valves... 6 Working section Working section part ordering codes... page 6 Dimensions and hydraulic circuit Spools "" side spool control kit Electrohydraulic controls... 7 "" side spool control kit ort valves L.S. port relief valves Outlet section Outlet section part ordering codes... page 77 Dimensions and hydraulic circuit Drain options DWWEDE

7 DC Series Index Special configurations Connection between DC Series valves... page 8 ccessories Coils and connectors... page 8 Installation Main rules... page 85 ppendix... page 86 DWWEDE 7

8 DC DC Series Dimensional data and performance Ø 8.5 Ø L 4.5. LS E F ype 6... Ref... DC/ 5568/4 product code customer reference product name production allotment E F Weight mm in mm in Kg lb DC/ DC/ DC/ DC/ DC/ DC/ DC/ DC/ DC/ DC/ ressure ressure ressure drop inlet compensator (margin pressure) 4 (bar) (US gpm) (psi) (l/min) Flow 4 (bar) () pressure drop (standard max.stroke) without compensator with compensator 8 th section st section l/min 6.4 US gpm l/min 4. US gpm (US gpm) (psi) (l/min) Flow 8 DWWEDE

9 DC Series DC Hydraulic circuit Open center configuration example V L V LS LS LS Open center circuit and one-side proportional electrohydraulic control with lever, with unloader valve and pressure reducing valve, port valve arrangement on all ports, LS port, internal pilot and external drain Closed center configuration example V L V LS LS LS Closed center circuit and one-side proportional electrohydraulic control with lever, with unloader valve and pressure reducing valve, antishock and anticavitation valves on all ports, L.S. relief valves on nd section, LS ports, internal pilot and external drain DWWEDE 9

10 DC DC Series Complete section ordering codes DC//R-S-EL/C-S8EZL/C-S8EZL.UUSS/RF-...-VDC-<S-CVN> Valve type Nr. of working sections he valve is supplied painted, as standard, with one coat of rimer black antirust paint 7 7 ie rod tightening wrench - Nm ( lbft) 7 7 DC//RF-S5/C-S8EZL/C-S8EZL.UUSS/RF-...-VDC-<S-CVN> ie rod tightening wrench - Nm ( lbft) 7 7 DWWEDE

11 DC Series DC Complete section ordering codes Inlet section * page YE: DC/R-S-DSK CODE: 64H DESCRIION: With -way compensator, L.S. pressure relief valve, pressure reducing valve and selector for open/closed center circuit Closed Center circuit YE: DC/N-S CODE: 64H DESCRIION: With secondary pressure control system and pressure reducing valve, with L.S. pressure relief valve. YE: DC/R-S-EL-VDC CODE: 64H DESCRIION: s previous one, with pressure reducing valve, and VDC solenoid operated unloader valve YE: DC/RF-S5 CODE: 6459 DESCRIION: With pressure reducing valve and L.S. pressure relief valve YE: DC/RSOG(SF)-S-ELN-VDC CODE: 644H5 DESCRIION: Shut-off configuration, with pressure reducing valve and L.S. pressure relief valve YE: DC/RS-S-EL-VDC CODE: 64H DESCRIION: Copy-Spool with dumper configuration, with secondary pressure control system, with pressure reducing valve, L.S. pressure relief valve and VDC solenoid operated unloader valve Open Center circuit YE: DC/N-S CODE: 64H4 DESCRIION: With -way compensator and L.S. pressure relief valve, without pressure reducing valve YE: DC/R-S-EL-VDC CODE: 64H DESCRIION: s previous one, with pressure reducing valve, and VDC solenoid operated unloader valve YE: DC/RS-S-EL-VDC CODE: 64H DESCRIION: Copy-Spool with dumper configuration, with -way compensator, pressure reducing valve, L.S. pressure relief valve and VDC solenoid operated unloader valve Working section * page With -way compensator YE: DC/C-S8EZL-VDC CODE: 64H DESCRIION: With double acting spool for 6 l/min (6 US gpm), proportional electrohydraulic control with lever YE: DC/C-S8EZL.UUSS-VDC CODE: 64H DESCRIION: s previous one, arranged for port valves and L.S. relief valves Without compensator YE: DC/D-S8EZL-VDC CODE: 64H DESCRIION: With double acting spool for 6 l/min (6 US gpm), proportional electrohydraulic control with lever YE: DC/D-S8EZL.UU-VDC CODE: 64H DESCRIION: s previous one, arranged for port valves YE: DC/CV-S8EZL-VDC CODE: 64H DESCRIION: With load check valve, double acting spool for 6 l/min (6 US gpm), proportional electrohydraulic control, with lever YE: DC/CV-S8EZL.UUSS-VDC CODE: 64H DESCRIION: With load check valve, double acting spool for 6 l/min (6 US gpm), proportional electrohydraulic control with lever, arranged for port valves and L.S. relief valves Outlet section * page 4 For valve with mechanical control YE: DC/RF CODE: 64 DESCRIION: Without ports For valve with hydraulic control YE: DC/RF CODE: 64 DESCRIION: Without ports, internal drain For valve with electrohydraulic control YE: DC/RF CODE: 64 DESCRIION: Without ports, L external drain YE: DC/RC CODE: 64 DESCRIION: With and ports (plugged), L external drain YE: DC/RD CODE: 645 DESCRIION: With and ports (plugged), LS port, L external drain 4 Valve threading Only specify if it is different from S standard (see page 5). 5 Voltage Specify the voltage of electric device 6 ump stand-by his option must be specified only if valve is configured for Closed Center circuit, without local compensation and if the value is different from 9 bar ( psi) 7 ssembling kit For valve with R-N-RS-RSO inlet sections CODE DESCRIION 5IR885 For working section valve 5IR8 For working sections valve 5IR88 For working sections valve 5IR88 For 4 working sections valve 5IR876 For 5 working sections valve 5IR845 For 6 working sections valve 5IR847 For 7 working sections valve 5IR85 For 8 working sections valve 5IR8568 For 9 working sections valve 5IR866 For working sections valve 7 ssembling kit For valve with RF inlet section CODE DESCRIION 5IR85 For working section valve 5IR8 For working sections valve 5IR849 For working sections valve 5IR897 For 4 working sections valve 5IR89 For 5 working sections valve 5IR89 For 6 working sections valve 5IR844 For 7 working sections valve 5IR8488 For 8 working sections valve 5IR856 For 9 working sections valve 5IR8584 For working sections valve NOE (*): Codes are referred to S thread. DWWEDE

12 DC DC Series Inlet section part ordering codes Valve setting (bar) DC / R - S - DSK -... DC / N - S -... DC / R - S - EL VDC DC / RS - S - EL VDC 5 6 DC / RSOG(SF) - S - ELN VDC DC / RF - S5 - S 5 Circuit conversion kit. 7 DWWEDE

13 DC Series DC Inlet section part ordering codes Inlet section kit* page 4 YE: DC/R-DSK CODE: 5FI65 DESCRIION: With compensator, pressure reducing valve and selector for open/closed center circuit Closed Center circuit YE: DC/N CODE: 5FI6 DESCRIION: With secondary pressure control system, without pressure reducing valve YE: DC/R CODE: 5FI6 DESCRIION: s previous one, with pressure reducing valve YE: DC/RSOG(SF) CODE: 5FI674G DESCRIION: Shut-Off type, with secondary pressure control system and pressure reducing valve (L.S. joint without filter) YE: DC/RS CODE: 5FI66 DESCRIION: Copy-Spool type, with secondary pressure control system and pressure reducing valve YE: DC/RF CODE: 5FI66 DESCRIION: With pressure reducing valve Open Center circuit YE: DC/N CODE: 5FI6 DESCRIION: With compensator, without pressure reducing valve YE: DC/R CODE: 5FI6 DESCRIION: With compensator and pressure reducing valve YE: DC/RS CODE: 5FI66 DESCRIION: Copy-Spool type, with compensator and pressure reducing valve. arts page hey are included in RF inlet section ordering code CODE DESCRIION 9745 ressure reducing valve 485 ressure reducing valve blanking plug L.S. pressure relief valves page Standard setting is referred to l/min (.6 US gpm flow). YE INIIL CODE DESCRIION LSD S CR65 With blind nut, range 4-8 bar (58-6 psi), std. setting 9 bar ( psi) CR6 s previous one, range 8-5 bar (6-5 psi), std. setting 8 bar (6 psi) LSH H CR66 With locked arrangement, range 4-8 bar (58-6 psi), std. setting 9 bar ( psi) CR67 s previous one, range 8-5 bar (6-5 psi), std. setting 8 bar (6 psi) LSZ Z 5CR6 With anti-tamper cap, range 4-8 bar (58-6 psi), std. setting 9 bar ( psi) 5CR69 s previous one, range 8-5 bar (6-5 psi), std. setting 8 bar (6 psi) S S 5KI6 Relief valve blanking plug Solenoid operated L.S. unloading valve page ER type coil is required: see chapter 6 YE CODE DESCRIION ELN EC8 Without emergency override EL EC8 With push-button emergency override EL EC85 With twist & push emergency override ELV EC84 With screw type emergency override L 5 Unloading valve blanking plug 4 Solenoid operated Shut-off pilot valve page type coil is required: see chapter 6 YE CODE DESCRIION ELN EJ85 Without emergency override EL EJ84 With screw emergency override 5 Section threading Only specify if it is different from S standard (see page 5). 6 Coil YE CODE DESCRIION VDC 4SLE VDC ER type coil, ISO44 connector (for unloading valve) For complete available coil list see page 8. 6 Coil YE CODE DESCRIION VDC 4SL VDC type coil, ISO44 connector (for Shut-Off pilot valve) For complete available coil list see page 8. 7 Circuit conversion kit CODE DESCRIION For R and N inlet sections 5KI Circuit conversion kit: from Open Center to Closed Center 5KI Circuit conversion kit: from Closed Center to Open Center For RS inlet inlet section 5KI Circuit conversion kit: from Open Center to Closed Center 5KI Circuit conversion kit: from Closed Center to Open Center NOE (*): Codes are referred to S thread. DWWEDE

14 DC DC Series Inlet section Dimensions and hydraulic circuit Example of R-DSK inlet section Configuration with pressure redicing valve and selector for Open/Closed center circuit. For complete dimensions see N type inlet section on the next page. K W V K V DSK valve: to screw for Open Center to unscrew for Closed Center Y DSK valve function Dim. mm in Open Center Open Center Z F G E LS 4 (bar) Reduced pressure ressure reducing valve diagram Reduced pressure vs. Flow (US gpm) (psi) (l/min) Flow uxiliary port specification V = G/4 pilot pressure port (max = bar - 45 psi) for hydraulic pilot control valve feeding ( OU) V = M4x.5 pilot pressure port for: - electrohydraulic control optional feeding (max = 5 bar - 46 psi) ( IN); G/4 joint is required, code 5GIU596 - pressure gauge connection; G/4 joint is required, code 5GIU6. Wrenches and tightening torque E = allen wrench 4 F = wrench 7-4 Nm (7.7 lbft) G = wrench 4-4 Nm ( lbft) K = allen wrench 5-4 Nm (7.7 lbft) = allen wrench 6-4 Nm (7.7 lbft) Y = allen wrench - 4 Nm (7.7 lbft) Z = wrench 9-4 Nm (7.7 lbft) W = wrench 4-4 Nm ( lbft) NOE: for relief valve and solenoid valve wrench and torque please see page. R-DSK type (Open Center) V V LS 4 DWWEDE

15 DC Series DC Inlet section Dimensions and hydraulic circuit Standard inlet section for Closed Center circuit: N type Configuration without pressure reducing valve V Y W.5.4 Z LS V max.64.4 max V V LS LS uxiliary port specification V = G/4 pilot pressure port for electrohydraulic control feeding (max = bar - 45 psi) ( IN) V = G/4 pressure gauge connection Wrenches and tightening torque = allen wrench 6-4 Nm (7.7 lbft) Y = allen wrench - 4 Nm (7.7 lbft) Z = wrench 9-4 Nm (7.7 lbft) W = wrench 4-4 Nm ( lbft) NOE: for relief valve wrench and torque please see page DWWEDE 5

16 DC DC Series Inlet section Dimensions and hydraulic circuit Standard inlet section for Closed Center circuit: R type Configuration withpressure reducing valve K.5.4 Z K LS V V Y W.4 5. max.64.4 max V V max..5 max LS LS (bar) Reduced pressure ressure reducing valve diagram Reduced pressure vs. Flow (US gpm) (psi) (l/min) Flow Wrenches and tightening torque E = allen wrench 4 F = wrench 7-4 Nm (7.7 lbft) G = wrench 4-4 Nm ( lbft) K = allen wrench 5-4 Nm (7.7 lbft) = allen wrench 6-4 Nm (7.7 lbft) Y = allen wrench - 4 Nm (7.7 lbft) Z = wrench 9-4 Nm (7.7 lbft) W = wrench 4-4 Nm ( lbft) NOE: for relief valve and solenoid valve wrench and torque please see page. uxiliary port specification V = G/4 pilot pressure port (max = bar - 45 psi) for hydraulic pilot control valve feeding ( OU) V = M4x.5 pilot pressure port for: - electrohydraulic control optional feeding (max = 5 bar 46 psi) ( IN); G/4 joint is required, code 5GIU596 - pressure gauge connection; G/4 joint is required, code 5GIU6. 6 DWWEDE

17 DC Series DC Inlet section Dimensions and hydraulic circuit Standard inlet section for Open Center circuit: N type Configuration without pressure reducing valve: dimensions are the same of N type 6. Z V V Y W uxiliary port specification V = G/4 pilot pressure port for electrohydraulic control feeding (max = bar - 45 psi) ( IN) V = G/4 pressure gauge connection Wrenches and tightening torque = allen wrench 6-4 Nm (7.7 lbft) Y = allen wrench - 4 Nm (7.7 lbft) Z = wrench 9-4 Nm (7.7 lbft) W = wrench 4-4 Nm ( lbft) NOE: for relief valve wrench and torque please see page V V LS LS Standard inlet section for Open Center circuit: R type Configuration with pressure reducing valve: dimensions are the same of R type 6. V K K V Y W V Z V Wrenches and tightening torque E = allen wrench 4 F = wrench 7-4 Nm (7.7 lbft) G = wrench 4-4 Nm ( lbft) K = allen wrench 5-4 Nm (7.7 lbft) = allen wrench 6-4 Nm (7.7 lbft) Y = allen wrench - 4 Nm (7.7 lbft) Z = wrench 9-4 Nm (7.7 lbft) W = wrench 4-4 Nm ( lbft) NOE: for relief valve and solenoid valve wrench and torque please see page. LS uxiliary port specification V = G/4 pilot pressure port (max = bar - 45 psi) for hydraulic pilot control valve feeding ( OU) V = M4x.5 pilot pressure port for: - electrohydraulic control optional feeding (max = 5 bar - 46 psi) ( IN); G/4 joint is required, code 5GIU596 - pressure gauge connection; G/4 joint is required, code 5GIU6. LS DWWEDE 7

18 DC DC Series Inlet section Dimensions and hydraulic circuit Inlet section with Shut-Off function: RSOG type For pressure reducing valve features, please see page 6. Solenoid operated Shut-Off pilot valve Z Y W max. 9 max K V LS uxiliary port specification M = G/4 pressure gauge connection V = G/4 pilot pressure port (max = bar - 45 psi) for hydraulic pilot control valve feeding ( OU) Wrenches and tightening torque K = allen wrench 5-4 Nm (7.7 lbft) = allen wrench 6-4 Nm (7.7 lbft) Y = allen wrench - 4 Nm (7.7 lbft) Z = wrench 9-4 Nm (7.7 lbft) W = wrench 4-4 Nm ( lbft) NOE: for relief valve wrench and torque please see page V M LS 8 DWWEDE

19 DC Series DC Inlet section Dimensions and hydraulic circuit Inlet section with Copy Spool function: RS type Configuration with variable-zone damper. For pressure reducing valve features, please see page H.47 V LS LS K V Y Z.4 5. max.64.4 max W I J variable-zone dumper standard setting.47 max..5 max H LS H K RS type (Open Center) RS type (Closed Center) uxiliary port specification V = G/4 pilot pressure port (max = bar - 45 psi) for hydraulic pilot control valve feeding ( OU) V = M4x.5 pilot pressure port for: - electrohydraulic controls optional feeding (max = 5 bar - 46 psi) ( IN); G/4 joint is required, code 5GIU596 - pressure gauge connection; G/4 joint is required, code 5GIU6. V V V V Wrenches and tightening torque I = wrench 7-4 Nm (7.7 lbft) H = allen wrench Nm (7. lbft) J = allen wrench 6 K = allen wrench 5-4 Nm (7.7 lbft) = allen wrench 6-4 Nm (7.7 lbft) Y = allen wrench - 4 Nm (7.7 lbft) Z = wrench 9-4 Nm (7.7 lbft) W = wrench 4-4 Nm ( lbft) NOE: for relief valve and solenoid valve wrench and torque please see page. LS LS DWWEDE 9

20 DC DC Series Inlet section Dimensions and hydraulic circuit Inlet section with secondary pressure control system: RF type ressure reducing valve Z.5 5. Z LS LS H uxiliary port specification M = G/4 pressure gauge connection 7.6 M Wrenches and tightening torque H = allen wrench Nm (7. lbft) = allen wrench 6-4 Nm (7.7 lbft) Z = wrench 9-4 Nm (7.7 lbft) NOE: for relief valve wrench and torque please see page. ressure reducing valve diagram Reduced pressure vs. Inlet pressure 5 (bar) Reduced pressure (psi) (psi) (bar) ressure M LS ressure reducing valve features Max. inlet pressure...: 8 bar (555 psi) Reduced presure range...: from to 45 bar (from 45 to 65 psi) Max. back pressure...: 5 bar (6 psi) DWWEDE

21 DC DC Series Inlet section L.S. pressure relief valve LSZ LSD W Y Y Y J J ressure vs. flow diagram code 4CO64 () = valve range 4-8 bar (58-6 psi) () = valve range 8-5 bar (6-5 psi) S 4 (bar) K Dim. Valve type mm in J J ressure LSH max. setting() (US gpm) max. setting() (psi) 5 medium range setting() 4 min. and std. setting() std. setting() min. setting() LSD.5.85 Legenda LSH 7.67 LSZ 4.4 LSH: with lock arrangement LSD: with blind nut LSZ: with anti-tamper cap S: valve blanking plug Wrenches and tightening torques = wrench - 4 Nm (7.7 lbf) Y = wrench Nm (7. lbf) (l/min) Flow W = allen wrench J = wrench 7-4 Nm (7.7 lbf) K = allen wrench 5-4 Nm (7.7 lbf) Solenoid operated L.S. unloading valve vailable on R and RS inlet sections. Valve Dim. C type mm in C ELN EL ELV EL 9.58 ELN EL F G ELV EL L Features Legenda For coil features and ER type coil options please see page 8. ELN: without emergency EL: push button emergency override ELV: screw emergency override EL: push&twist emergency override L: valve blanking plug Max. flow : 4 l/min (.6 US gpm) Max. pressure : 8 bar (55 psi) Internal leakage :.5 bar (.5 5 psi) E Wrenches and tightening torques F = wrench 4 - Nm ( lbf) G = manual tightening E = wrench - 4 Nm (7.7 lbf) Solenoid operated Shut-Off pilot valve vailable on RSO inlet section ELN EL Legenda G DWWEDE Features Valve Dim. type mm in Wrenches and tightening torques F = wrench 4 - Nm ( lbf) G = manual tightening F ELN: without emergency EL: screw emergency override ELN EL Max. flow : l/min (.8 US gpm) Max. pressure : 5 bar (5 psi) Internal leakage : bar (.6 5 psi) For coil features and type coil options please see page 84.

22 DC DC Series Working section part ordering codes Valve setting (bar) port port port port DC/D-N 8EZSSD L -...-VDC DC/C-S 8IM L. UU S5S Lever position: please see page D section Elemento C 4 DC/C6-CD 8IML.UUS5S port valve on port - valve on port - valve on and ports - port port port DC/C7-N 8EZ L.UU S5S5.LSN-...-VDC C6 section Lever position: see page C7 section C7S section DWWEDE

23 DC Series DC Working section part ordering codes Working section kit* page 6 Without compensator YE: DC/D CODE: 5EL6 DESCRIION: Without valve arrangement YE: DC/D CODE: 5EL6 DESCRIION: With port valve arrangement YE: DC/D CODE: 5EL6 DESCRIION: rranged for port valves and one L.S. relief valve YE: DC/G CODE: 5EL65 DESCRIION: For floating circuit, with port valve arrangement YE: DC/DM CODE: 5EL65 DESCRIION: For regenerative circuit, arranged for port valves and one L.S. relief valve Without compensator, with check valve YE: DC/CV CODE: 5EL6 DESCRIION: Without valve arrangement YE: DC/CV CODE: 5EL6 DESCRIION: s previous one with additional L.S. upper port YE: DC/CV CODE: 5EL6 DESCRIION: With port valve arrangement YE: DC/CV CODE: 5EL6D DESCRIION: rranged for port valves and one L.S. relief valve YE: DC/CV CODE: 5EL6 DESCRIION: s previous one with additional L.S. upper port YE: DC/CV CODE: 5EL6 DESCRIION: rranged for port valves and two L.S. relief valves YE: DC/FV CODE: 5EL64 DESCRIION: For floating circuit, with port valve arrangement YE: DC/CVM CODE: 5EL65 DESCRIION: For regenerative circuit, arranged for port valves and one L.S. relief valve With compensator YE: DC/C CODE: 5EL6 DESCRIION: Without valve arrangement YE: DC/C CODE: 5EL6 DESCRIION: s previous one with additional L.S. upper port YE: DC/C CODE: 5EL6 DESCRIION: With port valve arrangement YE: DC/C4 CODE: 5EL64 DESCRIION: s previous one with additional L.S. upper port YE: DC/C CODE: 5EL6. DESCRIION: rranged for port valves and one L.S. relief valve YE: DC/C CODE: 5EL6. DESCRIION: s previous one with additional L.S. upper port YE: DC/C CODE: 5EL6. DESCRIION: rranged for port valves and two L.S. relief valves YE: DC/F CODE: 5EL64 DESCRIION: For floating circuit, without port valve arrangement YE: DC/F CODE: 5EL64. DESCRIION: For floating circuit, with port valve arrangement YE: DC/CM CODE: 5EL65 DESCRIION: For regenerative circuit, arranged for port valves and one L.S. relief valve Special working section kit* page Sections with compensator, arranged for L.S. relief with independent drain and pressure control spools Dedicated spools are requested (see chapter and ) YE: DC/C6 CODE: 5EL6 DESCRIION: rranged for port valves and two L.S. relief with independent drain YE: DC/C7 CODE: 5EL6 DESCRIION: s previous one, with lower block for L.S. signal on/off unloader valve arrangement4 YE: DC/C7S CODE: 5EL6 DESCRIION: s type C6, with lower block for proportional unloader valve arrangement on port L.S. signal YE: DC/C7S CODE: 5EL DESCRIION: s type C6, with lower block for proportional unloader valve arrangement on port L.S. signal Standard spool page 4 Flow is referred to 7 bar ( psi) stand-by (margin pressure) YE CODE DESCRIION Double acting with and closed in neutral position C CU45 5 l/min (. US gpm) flow D CU4 l/min (.6 US gpm) flow V CU45 5 l/min (6.6 US gpm) flow Q CU44 4 l/min (.6 US gpm) flow S CU46 6 l/min (5.9 US gpm) flow N CU48 8 l/min (. US gpm) flow N CU4 l/min (6.4 US gpm) flow Double acting with and to tank in neutral position C CU445 5 l/min (. US gpm) flow D CU44 l/min (.6 US gpm) flow V CU445 5 l/min (6.6 US gpm) flow Q CU444 4 l/min (.6 US gpm) flow S CU446 6 l/min (5.9 US gpm) flow N CU448 8 l/min (. US gpm) flow CU44 l/min (6.4 US gpm) flow Double acting with and partially to tank in neutral position HC CU456 5 l/min (. US gpm) flow HD CU45 l/min (.6 US gpm) flow HV CU454 5 l/min (6.6 US gpm) flow HQ CU l/min (.6 US gpm) flow HS CU456 6 l/min (5.9 US gpm) flow HN CU458 8 l/min (. US gpm) flow H CU45 l/min (6.4 US gpm) flow Single acting on, plugged: G/ plug is required Q CU44 4 l/min (.6 US gpm) flow S CU46 6 l/min (5.9 US gpm) flow N CU48 8 l/min (. US gpm) flow N CU4 l/min (6.4 US gpm) flow Double acting with and closed in neutral position, 4 positions, floating in 4 th pos. with spool out: F, G or FV type section and type positioner or control are required 5Q CU444 4 l/min (.6 US gpm) flow 5S CU446 6 l/min (5.9 US gpm) flow 5N CU448 8 l/min (. US gpm) flow Double acting with and closed in neutral position, positions, regenerative in rd pos. with spool out: CM, DM or CVM type section, and 8 type dedicated control, with reduced stroke, are required 8F CU l/min flow (port -port ) (.-8.5 US gpm) Double acting with and closed in neutral position, 4 positions, regenerative in 4 th pos. with spool out: CM, DM or CVM type section and dedicated type positioner or control are required 8Y CU l/min (8.5 US gpm) flow DWWEDE

24 DC DC Series Working section part ordering codes Spool for independent drain page 4 Only for C6 - C7 - C7S type working sections Flow is referred to 7 bar ( psi) stand-by (margin pressure) YE CODE DESCRIION Double acting with and closed in neutral position V CU45 5 l/min (6.6 US gpm) flow Q CU44 4 l/min (.6 US gpm) flow S CU46 6 l/min (5.9 US gpm) flow N CU48 8 l/min (. US gpm) flow Double acting with and partially to tank in neutral position HV CU454 5 l/min (6.6 US gpm) flow HQ CU l/min (.6 US gpm) flow HN CU458 8 l/min (. US gpm) flow ressure control spool page 6 Only for C6 - C7 type working section Flow is referred to 7 bar ( psi) stand-by (margin pressure) YE CODE DESCRIION Doppio effetto con e chiusi in posizione centrale CD CU4 l/min (.6 US gpm); control on and CV CU45 5 l/min (6.6 US gpm); control on and CD CU4 l/min (.6 US gpm); control on CV CU45 5 l/min (6.6 US gpm); control on CQ CU44 4 l/min (.6 US gpm); control on Doppio effetto con e parz. a scarico in posizione centrale HCD CU4 l/min (.6 US gpm); control on and HCV CU45 5 l/min (6.6 US gpm); control on and HCD CU4 l/min (.6 US gpm); control on HCV CU45 5 l/min (6.6 US gpm); control on HCQ CU44 4 l/min (.6 US gpm); control on "" side spool control kit page 8 YE CODE DESCRIION Mechanical positioners 7F # 5V7 With friction and center pos. feeling 8 5V8 position, spring return to neutral position 5V For floating circuit (type 5 spool), 4 pos., detent in 4 th position, with spring return to neutral position NOE ( # ): his control requires modification to the standard spool: for spool replacement please see page. roportional hydraulic controls 8IM 5V88* Range 5-5 bar (7-8 psi) Electrohydraulic controls page 4 YE CODE DESCRIION Standard types 8EZ-VDC 5V878 With ISO44 connector 8EZ-4VDC 5V878 With ISO44 connector 8EZ4-VDC 5V888 With flying leads 8EZ4-4VDC 5V888 With flying leads 8EZ4D-VDC 5V8886 With Deutsch connector 8EZ4D-4VDC 5V8887 With Deutsch connector 8EZ-VDC 5V8874 With M integrated conn. 8EZ-4VDC 5V8875 With M integrated conn. 8EZ4-VDC 5V887 With Deutsch integrated conn. 8EZ4-4VDC 5V887 With Deutsch integrated conn. With digital spool position sensor # 8EZSSD-VDC 5V887 With M integrated connector 8EZSSD-4VDC 5V8876 With M integrated connector 8EZ4SSD-VDC 5V887C With Deutsch integrated conn. 8EZ4SSD-4VDC 5V887D With Deutsch integrated conn. With analog spool position sensor # 8EZSSL-VDC 5V887 With M integrated connector 8EZSSL-4VDC 5V8878 With M integrated connector 8EZ4SSL-VDC 5V887E With Deutsch integrated conn. 8EZ4SSL-4VDC 5V887F With Deutsch integrated conn. For floating circuit: type 5 spool is required EZ-VDC 5V78 With ISO44 connector EZ-4VDC 5V78 With ISO44 connector For position regenerative circuit: type 8F spool is required 8EZCR-VDC 5V8798 With ISO44 connector 8EZCR-4VDC 5V8799 With ISO44 connector For 4 position regenerative circuit: type 8Y spool is required EZ-VDC 5V78 With ISO44 connector EZ-4VDC 5V784 With ISO44 connector EZ-VDC 5V786 With M integrated connector EZ-4VDC 5V785 With M integrated connector NOE ( # ): hese controls require modification to the standard spool: for spool replacement please see page 8. 4 "" side spool control kit page 45 YE CODE DESCRIION L 5LEV7 luminium lever box LN 5LEV7 s previous one, without lever LZ 5LEV7 s L type, with anti-tamper screw caps LG 5LEV86 Cast iron lever box 5 ort valves page 46 YE CODE DESCRIION U 544 Valve blanking plug C 5KI4 nticavitation valve Fixed setting antishock and anticavitation valves: setting is referred to l/min (.6 US gpm) YE: U CODE: 5KI setting (bar) setting (bar) SEING: 5 bar (75 psi) 6 bar (94 psi) 8 bar (5 psi) bar (45 psi) bar (59 psi) 5 bar (8 psi) 4 bar (5 psi) 5 bar (5 psi) 6 bar ( psi) 75 bar (55 psi) 9 bar (75 psi) bar (9 psi) bar (5 psi) bar (5 psi) 4 bar (5 psi) 5 bar (6 psi) 6 bar (75 psi) 7 bar (9 psi) 8 bar (45 psi) 9 bar (4 psi) bar (45 psi) bar (45 psi) bar (465 psi) 4 bar (495 psi) 6 bar (5 psi) 4 bar (58 psi) 4 bar (6 psi) NOE (*): Codes are referred to S thread. 4 DWWEDE

25 DC Series DC Working section part ordering codes 6 L.S. port relief valves page 46 Standard setting is referred to l/min (.6 US gpm) flow. YE ID CODE DESCRIION LSD S CR65 With blind nut, range 4-8 bar (58-6 psi), standard setting 9 bar ( psi) CR6 Range 8-5 bar (6-5 psi), standard setting 8 bar (6 psi) LSH H CR66 With locked arrangement, range 4-8 bar (58-6 psi), std setting 9 bar ( psi) CR67 Range 8-5 bar (6-5 psi), standard setting 8 bar (6 psi) LSZ Z 5CR6 With anti-tamper cap, range 4-8 bar (58-6 psi), std setting 9 bar ( psi) 5CR69 Range 8-5 bar (6-5 psi), standard setting 8 bar (6 psi) S S 5KI6 Relief valve blanking plug 7 Solenoid operated L.S. unloading valve page 47 On/off type for C7 section ER coil is required: see chapter 9 YE CODE DESCRIION LS 5 Valve blanking plug Normally open circuit (NO) LSN(N) EC8 Without manual emergency LSV(N) EC84 With screw type emergency LS(N) EC8 With push-button emergency LS(N) EC85 With push & twist emergency Normally closed circuit (NC) LSN(NC) EC8 Without manual emergency LSV(NC) EC87 With screw type emergency LS(NC) EC86 With pull-button emergency LS(NC) EC88 With pull & twist emergency 7 Solenoid operated L.S. unloading valve page 48 roportional type for C7S - C7S sections Valvole ordering code is inclusive of coil YE CODE DESCRIION MC/ MC9 Range from 5 to bar (7 to 89 psi), VDC coil, ISO44 connector MC/ MC Range from 5 to 7 bar (7 to 47 psi), VDC coil, ISO44 connector MC/ MC Range from 5 to bar (7 to 5 psi), VDC coil, ISO44 connector MC/4 MC Range from 5 to 8 bar (7 to 45 psi), VDC coil, Deutsch D4 connector 8 Section threading Only specify if it is different from S standard (see page 5). 9 Coil YE CODE DESCRIION VDC 4SLE VDC ER type coil, ISO44 connector (for unloading valve) For complete available coil list please see page 8. CODE 778 lug for single acting spool* DESCRIION G/ plug DWWEDE 5

26 DC DC Series Working section Dimensions and hydraulic circuit Without compensator D tyoe without port valves arrangement D typr with port valves arrangement LS.4 port valve port valve allen wrench 6 4 Nm (7.7 lbft) D type arrangement for port valves and 5.59 one L.S. relief valve L.S. valve on and ports lever side 6.4 port valve port valve D type without port valve arrangement D type with port valve arrangement D type as D, arrangement for one L.S. relief valve G type as D, for floating circuit DM type as D, for regenrative circuit LS LS LS LS LS 6 DWWEDE

27 DC Series DC Working section Dimensions and hydraulic circuit Without compensator with check valve he unlisted dimensions are the same of section without compensator. CV type without port valves arrangement CV type without port valves arrangement, with upper L.S. port LS Z LS'.8.46 Wrenches and tightening torque = allen wrench 6-4 Nm (7.7 lbft) Z = allen wrench - 4 Nm (7.7 lbft).5.8 C type C type LS LS LS DWWEDE 7

28 DC DC Series Working section Dimensions and hydraulic circuit Wihout compensator with check valve he unlisted dimensions are the same of section without compensator. CV type arrangement for port valves and CV type with port valves arrangement port valve one L.S. relief valve L.S. valve on and ports port valve port valve port valve CV type arrangement for port valves and L.S. L.S. valve on ports relief valves port valve CV type arrangement for port valves and one L.S. relief valve, with upper L.S. port L.S. valve on and ports port valve LS'..476 port valve L.S. valve on ports port valve FV type CVM type CV type CV type CV type CV type as CV, for floating circuit as CV, for regenrative circuit LS LS LS LS LS LS LS 8 DWWEDE

29 DC Series DC Working section Dimensions and hydraulic circuit With compensator he unlisted dimensions are the same of previous sections. C type without port valves arrangement C type without port valves arrangement, with upper L.S. port LS LS' Z C type with port valves arrangement port valve port valve 4.57 C type arrangement for port valves and one L.S. relief valve L.S. valve on and ports port valve Wrenches and tightening torque = allen wrench 6-4 Nm (7.7 lbft) Z = wrench 9-5 Nm (6.9 lbft) port valve C type C type C type C type LS LS LS LS LS DWWEDE 9

30 DC DC Series Working section Dimensions and hydraulic circuit With compensator he unlisted dimensions are the same of previous sections. C type arrangement for port valves and L.S. relief valves L.S. valve on ports port valve C type C type LS C type LS C4 type port valve L.S. valve on ports C type arrangement for port valves and one L.S. relief valve, with upper L.S. port L.S. valve on and ports port valve LS' port valve C4 type with port valves arrangement and upper L.S. port LS LS LS LS port valve LS' F type as C, for floating circuit F type as C, for floating circuit CM type as C, for regenrative circuit port valve LS LS LS DWWEDE

31 DC Series DC Working section Dimensions and hydraulic circuit With compensator Special sections with L.S.signal independent drain; to be use with dedicated spools or pressure control spools. he unlisted dimensions are the same of previous sections. C6 type arrangement for port valves and L.S. relief valves with independent drain LS C7 type as C6 with arrangement for L.S. signal on/off unloader valves LS 6. Z Z W L.S. valve on ports port valve L.S. valve on ports port valve port valve L.S. valve on ports port valve L.S. valve on ports Wrenches and tightening torque = allen wrench 6-4 Nm (7.7 lbft) Z = wrench 9-5 Nm (6.9 lbft) W = allen wrench Nm (4.9 lbft) LS LS LS LS DWWEDE

32 DC DC Series Working section Dimensions and hydraulic circuit With compensator Special sections with L.S.signal independent drain; to be use with dedicated spools or pressure control spools. he unlisted dimensions are the same of previous sections. C7 type as C6 with proportional unloader valve arrangement on port L.S. signal Wrenches and tightening torque Z = wrench 9-5 Nm (6.9 lbft) W = allen wrench Nm (4.9 lbft) W Z L.S. valve on ports port valve LS port valve DWWEDE

33 DC Series DC Working section Dimensions and hydraulic circuit With compensator Special sections with L.S.signal independent drain; to be use with dedicated spools or pressure control spools. he unlisted dimensions are the same of previous sections. C7 type as C6 with proportional unloader valve arrangement on port L.S. signal Wrenches and tightening torque Z = wrench 9-5 Nm (6.9 lbft) W = allen wrench Nm (4.9 lbft) W Z Valvola bocca Valvola bocca Valvola L.S. bocca LS DWWEDE

34 DC DC Series Working section Standard spools type spool, closed in neutral position type spool, open to tank in neutral position H type spool, partially to tank in neutral position type spool single acting on Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) 5 type spool floating in 4 th position (pos.) 8F type spool regenerative in nd position (pos.) 8Y type spool regenerative in 4 th position (pos.) Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) position : + mm (+.47 in) Spool stroke position : + 6 mm (+.4 in) position : - 6 mm (-.4 in) Spool stroke position : mm (+.8 in) position : - 4. mm (-.7 in) position : mm (+. in) Spools for independent drain For C6, C7, C7S, C7S type working sections... type spool, closed in neutral position H.. type spool, partially to tank in neutral position Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) 4 DWWEDE

35 DC Series DC Working section Standard and independent drain spools Following curves are detected with standard spools, connecting and ports without flow multiplication. Customized spools with backpressure or flow multiplication may require different force, pressure and pilot current for operation. Metering curves Compensated working section - position spools Qin = 5 l/min (9.6 US gpm) (psi) 5 (l/min) ort flow (in) (US gpm) N N 4 S S Q Q 6 With 8IM control kit With 8EZ and 8EZ control kit V D V D 8 C C (mm) position Spool stroke position ilot pressure (bar) Current (m@vdc) (m@4vdc) Non-compensated working section Spool flow vs. Stand-by pressure (margin pressure) (psi) 6 (l/min) N 4 (US gpm) S Q 8 V 4 D C (bar) 7 ressure ort flow Spool nominal 7 bar ( psi) stand-by (margin pressure) C = 5 l/min (. US gpm) D = l/min (.6 US gpm) V = 5 l/min (6.6 US gpm) Q = 4 l/min (.6 US gpm) S = 6 l/min (5.9 US gpm) N = 8 l/min (. US gpm) = l/min (6.4 US gpm) DWWEDE 5

36 DC DC Series Working section ressure control spools Introduction he instability of the Load Sensing systems in certain applications, with / - Hz frequency load oscillations, can cause serious operation control issues. Critical applications are generally due to operations with a major inertia torque and/or functions with controlled secondary pressure components (counterbalance valves). For example: rotation function main crane lifting/descent function. Features he pressure control spools are designed in such a way that the stroke controls the pump pressure. he spool must be actuated until the pump pressure slightly exceeds the load pressure before the work function is applied. If the spool is kept in this position, the pump pressure will remain constant, even in case of load pressure changes, thus ensuring system stability. Use of the pressure control spool, means as well: both the fluid flow and the dead band depend on the load a flow proportional to the Δ between the L.S. signal and the load on the port, which does not remain constant will be dispensed. the pressure drop through the main spool is due to vary (energy consumption). ecause of these factors, the pressure control spools must only be used when load instability issues are ascertained and in those applications where constant pressure is required such as Drilling Machines. pplication he pressure control spools should only be used when load stability problems exist, as could occur during lifting/descent and rotation (with cylinders) operations of a crane. For the lifting/descent operation a single type pressure control spool is best used. his type of spool is designed for normal flow control on the port used for lifting, and for pressure control on the port connected to the pilot signal of the counterbalance valve. n independent load lifting movement is thus obtained, as well as a dropping function which is stable but dependent on the load. In the rotation function, the load pressure is usually constant, irrespective of the fact whether the crane is loaded or not, and a spool must therefore be used with pressure control function on both ports and. In both cases a working section with pressure compensator is required (C6 or C7 types). lways make a point of using the L.S. pressure relief valves, which not only ensure individual pressure limitation but also allow adjusting the max flow to ports. ny anti-shock valves must be set to % higher than the setting values of the L.S. pressure relief valves. Limitation he use of the pressure control spools therefore allows limiting oscillations and obtaining smooth and precise control of the function with the following limitations: the non-adjustment stroke of the spool (dead band) will depend on load conditions the working section of the control valve will lose the "load independent" characteristic pump pressure could exceed load pressure. 6 DWWEDE

37 DC Series DC Working section ressure control spools C(D,V,Q) type spool, closed in neutral position C(D,V,Q) type spool, closed in neutral position ressure control on and ports Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) HC(D,V,Q) type spool, partially to tank in neutral position ressure control on port Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) HC(D,V,Q) type spool, partially to tank in neutral position Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) Spool stroke position : + 7 mm (+.8 in) position : - 7 mm (-.8 in) Flow vs ressure curve Size V ( lmin -.6 US gpm) spool 5 (l/min) Flow on ports (l/min) Flow on ports 4 5 (US gpm) (bar) ressure Flow vs ressure curve Size D (5 l/min US gpm) spool (l/min) Flow on ports 4 5 Example p (psi) (US gpm) (bar) ressure (psi) Flow vs ressure curve Size Q (4/lmin -.6 US gpm) spool Example (US gpm) (bar) ressure (psi) Sizing Example : how to determine the flow to ports o know the flow to ports of a spool of known size, you need to know the seting pressure of the valve on the L.S. signal as well as the operating pressure. s shown in the example, the spool is size D (5 l/min in flow control), the valve on the LS signal is calibrated at bar - 5 psi (zero flow to port with such load). Following the third parabola of the operating curve, it can be seen that with a load of 5 bar - psi we have 55 l/min US gpm on port. Example : how to determine the spool size It is necessary to know the flow to port (e.g., 55 l/min US gpm), the setting pressure of the pressure relief valve on the L.S. signal (8 bar - 6 psi) and the operating pressure (5 bar - psi). racing the parabolas parallel to those entered in the characteristic curve graphs, in the spool type Q we obtain a curve that crosses the required points: 55 l/min at 5 bar US gpm and l/min - US gpm at 8 bar - 6 psi. DWWEDE 7

38 DC DC Series Working section "" side spool control kit With friction and center position feeling: 7F type Y Z W Features Friction load adjusting... : -5 N (4.5-4 lbf) Friction load std. setting.. : N (.5 lbf) Center tap (more than load).: N (.5 lbf) spool screw NOE: spool replacement he spool for this control is to be selected from the list on page -4. o assemble the spool remove the screw (wrench ) on spool back and trash it. hen clean the cavity from Loctite residue. Wrenches and tightening torque = allen wrench Nm (7. lbf) Y = wrench 4-4 Nm ( lbf) Z = wrench - 4 Nm (7.7 lbf) W = allen wrench 6 With spring return to neutral position: 8 type It is supplied with standard spring type (see force-stroke diagram); available with stronger spring C type (8MC code: 5V8). 6.6 Force vs. Stroke diagram (in) Force (N) Spring C type Spring type (in) (lbf) Wrenches and tightening torque = allen wrench Nm (7. lbf) pos. (mm) pos. (mm) Stroke Spring type = from 5.6 N (8 lbf) to 8.8 N (8.4 lbf) Spring C type = from 8. N (8.5 lbf) to 6.8 N (6. lbf) 8 DWWEDE

39 DC Series DC Working section "" side spool control kit With detent in 4 th position (pos.), for floating circuit: type F, G or FV type working sections and floating circuit 5 type spool are requested for Y Features Detent force (±%)... : N (7 lbf) Release force (±%)... : N (4.7 lbf) Wrenches and tightening torque = allen wrench Nm (7. lbf) Y = wrench - 4 Nm ( 7.7 lbf) roportional hydraulic controls. G/4 nr. threads V V 7.6 V V Features Max. pressure...: 5 bar (75 psi) Wrenches and tightening torque = allen wrench Nm (7. lbf) Y = wrench - 4 Nm ( 7.7 lbf) ressure (bar) 5 5 Stroke vs. ressure diagram spool dead band (in) (psi) (mm) position Stroke position ilot pressure (in) 4 (psi) 5 bar (58 psi) (bar) 5 Suggested pressure control curve: type 5. bar ( psi) 4. bar (6 psi) 7.5 mm (.9 in) 7.6 mm (. in) 4.85 mm (. in) (mm) usher stroke DWWEDE 9