Motion control valves - dmhydro.co.kr

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2 The pilot assist function reduces total1E80/819 Overcenterpump pressure required to move the load during the1E1611work cycle. Most overcenter valves are mounted in, on,1E80/8212or directly next to the cylinder actuator to prevent run1E2113away as a result of a system or line overcenter function is the same as above exceptOvercenterthe vented feature is used to minimize back pressure1E90/9110(Vented)which could affect response or overcenter valves in one body allow cross-porting1E80/1EE8115 Overcenterwith a minimum of valves combine the features of a1 EEC1118 control anddual overcenter valve plus make-up (MUDROC)*)GeneralUsed to control moving loads and prevent loads from runningahead of pump. Holds load in any position without drift andprovides overload relief and thermal expansion control valves can provide: Smoothly controlled loads, when starting, stopping and duringoperations.

3 Load holding capability. Positive pump pressure or anti-cavitation. Single or dual models. Gasket or line mounted models. Thermal expansion relief. Full flow overload and OperationMake-upMotion control valvesIntroduction*) Acronym for Make-Up, Dual Relief, Over Danfoss Fluid Power 9/93 Fluid PowerGeneral ApplicationCounterbalance valves are used where loads being held in controlare unchanging. Used when load does not go valves are available is single or dual models. Singleovercenters are used when the cylinder actuator can run away inonly one direction. The dual overcenter is best applied when thecylinder or actuator can run away in both directions of control and Loader valves MUDROC * are typicallyused on hydraulic motor-driven swing or traction circuits.*(MUDROC is an acronym for Make-Up, Dual Relief, Over Centre) Motion control valvesIntroductionTypical CircuitDual Danfoss Fluid Power 9/934 Fluid PowerPerformance curvesSpecifications To 95 l/min and 210 bar.

4 Weight: 1,63 Excellent pressure vs. flowcharacteristics. Lapped, hardened steel working partsfor long life. Low leakage. Fast response. Rugged, dirt tolerant and reliable. Built-in reverse flow check. 100% performance and operationTo hold and position heavy loads in theup position and prevent flows through the free flow check toraise the load. With control valvecentered and relief set higher than load p through free flow checkpressure, the load is held and will notmove until powered down. Recommendsetting relief valve at least timesmaximum load induced Body High-strength aluminium alloy. Check component Hardened steel poppet. Internal parts Hardened steel. Seals Buna-N or Viton to order1B12 - P 4 - 15 SADJUST. MEANSP= Leak Proof ScrewADJUSTMENT RANGE8 = 7-55 barStd.

5 Setting 41 bar15 = 17-105 barStd. Setting 70 bar30 = 70-210 barStd. Setting 105 barBASE PART = Buna-NSV = Viton APORT SIZE12T = 3/4" SAE3 = 3/8" NPTF4 = 1/2" NPTF6 = 3/4" NPTF4W =G 1/26W =G 3/4 ValveportVCCylinderportUsed as reliefCounterbalance valveTo 95 l/min and 210 barParts in Body 1B12 VCCV76,223,658,782,6 Free flow96,5136,7176,838,119, Danfoss Fluid Power 9/93 Fluid PowerAluminium Body: To 150 l/min and 175 bar. Steel Body: To 150 l/min and 350 barSpecificationsAluminium Body To 150 l/min and 175 bar. Reseat pressure is 65% of setting. Maximum inlet pressure: 210 bar. Maximum load induced pressures to:67 bar for -15 range112 bar for -25 range(based on 65% reseat). Cavity number: FC-76 (see page 22). Weight: 2,00 Body To 150 l/min and 350 bar. Reseat pressure is 65% of setting.

6 Maximum inlet pressure: 350 bar. Maximum load induced pressures to:179 bar for -40 range224 bar for -50 range(based on 65% reseat). Cavity number: FC-76 (see page 22). Weight: 4,45 Excellent pressure vs. flowcharacteristics. Lapped, hardened steel workingparts for long life. Low leakage. Fast response. Rugged, dirt tolerant and reliable. Built-in reverse flow check. Adjustable with min. and max. stops. 100% performance and operationUsed to position and lock heavy loads inthe up position and prevent flows through the free flow check toraise the load. With directional controlvalve centered and relief set higher thanload pressure, the load is locked andwill not move until powered relief setting is at times maximum load Body High-strength aluminium alloyor high strength steel.

7 Internal parts Hardened steel. Cartridge Hardened steel. Seals Viton A ,569,97,4 114104,731,8 161 Relief cartridge 1L106,4 10,357,2101,688,931,8 Counterbalance valve21 Cartridge and Parts in Body Danfoss Fluid Power 9/936 Fluid PowerPerformance curves1LC11 - F 16T - 25 SV 33 MODIFICATIONOMIT = Alum. Body for210 bar Service33 = Steel Body for350 bar ServiceSEALSSV = Viton AADJUSTMENT RANGE15 = 14-103 barStd. Setting 55 bar25 = 34-172 barStd. Setting 103 bar40* =67-276 barStd. Setting 172 bar50* =138-345 barStd. Setting 276 barBASEPART SIZE (Body No.)16T = 1" SAEA luminium (1LC11-16T-SV)Steel (1LC11-16T-SV33)8 = 1" NPTFA luminium (1LC11-8-SV)Steel (1LC11-8-SV33)How to order P throug free flow checkUsed as relief* For Use in Steel Body (MOD 33) Only0038761151511902,85,58,31114l/minbar 387615111542028070l/min03500138 - 345 bar67 - 276 bar34 - 172 bar34 - 172 bar67 - 276 bar210140barCounterbalance valve Danfoss Fluid Power 9/93 Fluid PowerPerformance curveSpecifications To 60 l/min and 350 bar.

8 Maximum load induced pressures to:260 bar for -50 range155 bar for -30 range(based on 75% reseat) Pilot ratios available: 1,2:1; 2,75:1;4,9:1; 10,75:1. Weight: 0,91 Fast acting, reliable operation. Lapped, hardened steel working partsfor long life. Low leakage. Built-in reverse flow check. Adjustable. 100% performance and operationTo control moving loads and prevent loadsfrom running ahead of pump. Holds load inany position without drift and providesoverload relief and thermal expansion reliefwith open center control load is raised by free flow of oilthrough check section. With control valvecentered, load is held (relief must be set atleast 30% higher than the maximum loadinduced pressure.) When lowering load,pilot pressure reduces the valve setting,allowing the load to be smoothly controlledwith minimum energy loss.

9 If load tries torun ahead of pump, pilot pressure willdecrease and the relief section will throttleor close to prevent Body High strength aluminium alloy. Internal parts Hardened steel. Check component Hardened steel ball. Seals Buna-N or Viton - P 3 - 50 S 45 PORT SIZE6T = 3/8" SAE (C & V Port)1/4" SAE (X Port)8T = 1/2" SAE (C & V Port)1/4" SAE (X Port)2 = 1/4" NPTF (C & V Port)1/4" NPTF (X Port)3 = 3/8" NPTF (C & V Port)1/4" NPTF (X Port)4 = 1/2" NPTF (C & V Port)1/4" NPTF (X Port)4W =G 1/2 (C & V Port)G 1/4 (X Port)ADJUST. MEANSP= Leak ProofScrewBASE PART RANGE30 = 70-210 barStd. Setting 175 bar50 = 70-350 barStd. Setting 280 barSEALSS = Buna-NSV = Viton APILOT RATIOOMIT = 10,75:1 Ratio68 = 1,2:1 Ratio45 = 2,75:1 Ratio116 = 4,9:1 RatioHow to orderParts in Body 1E1144,547,8 VCP36,630,2 8,626,976,241,4 167108,031,816,0 Pilot portValve portCCylinderportVOvercenter valveTo 60 l/min and 350 barPilot Pressure Calculation ExampleRelief Setting Load Pressure= Pilot Pressure RequiredPilot RatioWith 2,75:1 pilot ratio, relief set at 126 bar and 70 bar loadpressure, then 21 bar pilot pressure is needed to move bar 70 bar= 21 bar2, Danfoss Fluid Power 9/938 Fluid PowerOvercenter valve (line or gasket mounted)To 95 l/min and 350 barSpecifications To 95 l/min and 350 bar.

10 Maximum load induced pressures to:260 bar for -50S range155 bar for -30S range(based on 75% reseat) Pilot ratios available: 1,2:1; 2,75:1;4,9:1; 10,75:1. Weight: 1,32 Fast acting, reliable operation. Lapped, hardened steel working partsfor long life. Low leakage. Built-in reverse flow check. Gasket mounted available. 100% performance tested. and operationTo control moving loads and preventloads from running ahead of load in any position without driftand provides overload relief and thermalexpansion relief with open center controlvalves. Gasket mount is designed to bedirectly mounted to cylinder to load is raised by free flow of oilthrough check section. With controlvalve centered, load is held (relief mustbe set at least 30% higher than themaximum load induced pressure.) Whenlowering load, pilot pressure reduces thevalve setting, allowing the load to besmoothly controlled with minimumenergy loss.