Hydraulic Pressure Control Val ves

1 Webtec Products LimitedQuality Hydraulic Components from the Webtec RangeHydraulic PressureControl ValvesQuality Hydraulic Components from the Webtec RangeCONTENTSDESCRIPTIONPAGE 020 Direct In-Line Relief Valve1RV 025 Pressure Relief Valve3RV 050 Pressure Relief Valve 5 RV 5 Pressure Relief Valve7RV 125 Pressure Relief Valve 9PC 75 Pressure Relief Valve 11 CLRVP 51 Cross Line Relief Valve 131RV 020 Direct In-lineRelief ValvePRESSURE RELIEF VALVES limit the maximumworking Pressure of a Hydraulic system to a pre-determined rating thus providing protection against theoverloading of system acting relief valves unload flow to tank whensystem Pressure is sufficient to compress a springwhich unseats a poppet. They have a high tolerance tocontamination and are generally used for low flow rateswhere precise Pressure Control is not Pressure :210 barMaximum Flow:20 lpmPorting:see Table 1, ordering codesMaterial:steel components in High Tensile Aluminium kgSymbolQuality Hydraulic Components from the Webtec RangeFeatures Direct acting in-line relief valve giving hightolerance to particle contamination.

2 Quick response provides protection against shockloads. Relief Pressure is factory set to customerrequirements within a range between 20 - 210 bar. Straight through porting allows the valve to beconnected directly in-line * thus making the bestuse of restricted space. Provides protection against thermal expansion offluids.*with a T Hydraulic Components from the Webtec RangeORDERING CODEST ypical CodeRV020150 JARV020 - Valve TypeRelief Pressure Setting in barbetween 20 - 210 barPorting (Table 1)A - Design StandardTable 1: Inlet PortingTYPICAL CHARACTERISTICS(at one Pressure setting)Curve established using Hydraulic mineral oil with viscosity of centistokes at 49 CCodePort ThreadsA3/8 - 18 NPTF (Only applies for inlet thread)J3/8 BSPF (Parallel)051015202040608010012014016018 0200 Flow (lpm) Pressure (bar)INSTALLATION DETAILSD imensions in millimetresReturn To Tank3/8 Male Inlet(Internal cone on BSPF version)3/8 - 18 NPSM Outlet 025 Pressure Relief ValvePRESSURE RELIEF VALVES limit the maximumworking Pressure of a Hydraulic system to a pre-determined rating thus providing protection against theoverloading of system acting relief valves unload flow to tank whensystem Pressure is sufficient to compress a springwhich unseats a poppet.

3 They have a high tolerance tocontamination and are generally used for low flow rateswhere precise Pressure Control is not Pressure :210 barMaximum Flow:23 lpmPorting:see Table 2, ordering codesMaterial:steel components in high tensile aluminium kgSymbolQuality Hydraulic Components from the Webtec RangeFeatures Direct acting, in-line relief valve giving hightolerance to contamination. Quick response provides protection against shockloads. Relief Pressure is adjustable by means of a screwand locknut. See Table 1, ordering codes foravailable adjustment ranges. Provides protection against thermal expansion offluid. Can be used as a remote Control for a pilotoperated relief valve by substituting for the built indirect acting relief valve of the pilot operated valve. Flow through Pressure and tank ports enable thevalve to be connected in-line with mountingversatility and Hydraulic Components from the Webtec PortsPressure CODEST ypical CodeRV0253J RV025 - Valve TypeAdjustment Range (Table 1)Porting (Table 2)Table 1: Adjustment RangeTable 2.

4 PortingTYPICAL CHARACTERISTICS(at one Pressure settings)Curve established using hydraulics mineral oil with viscosity centistokes at 49 C005104080120160200152025 Flow (lpm)Inlet Pressure (bar)INSTALLATION DETAILSD imensions in millimetresCodePort ThreadsI9/16 - 18 UNFJ3/8 BSPCodeRange110 - 27 bar227 - 70 bar370 - 103 bar4103 - 180 bar5180 - 210 bar5RV 050 Pressure Relief ValvePRESSURE RELIEF VALVES limit the maximumworking Pressure of a Hydraulic system to a pre-determined rating thus providing protection against theoverloading of system acting relief valves unload flow to tank whensystem Pressure is sufficient to compress a springwhich unseats a poppet. They provide high tolerance tocontamination and are generally used for low flow rateswhere precise Pressure Control is not Pressure :210 barMaximum Flow:50 lpmPorting: see Table 2, ordering codesMaterial:steel components in high tensile aluminium bodyWeight: kgSymbolQuality Hydraulic Components from the Webtec RangeFeatures Direct acting, in-line relief valve giving hightolerance to contamination.

5 Quick response provides protection against shockloads. Relief Pressure is adjustable by means of a screwand locknut. See Table 1, ordering codes foravailable adjustment ranges. Provides protection against thermal expansion offluid. Can be used as a remote Control for a pilotoperated relief valve by substituting for the built indirect acting relief valve of the pilot operated valve. Flow through Pressure ports enable the valve tobe connected in-line with mounting versatility Hydraulic Components from the Webtec cap for screwdriver adjustmentORDERING CODEST ypical CodeRV050 IJSRV050 - Valve TypeAdjustment Range (Table 1)Porting (Table 2)Adjustment Method (Table 3)Table 1:Adjustment RangeTable 2:PortingTable 3:Adjustment MethodTYPICAL CHARACTERISTICS(at one Pressure Setting)Curve established using Hydraulic mineral oil with viscosity of centistokes 49 C0010408012016020020304050 Flow (lpm)Inlet Pressure (bar)CodePort Threads110 - 103 bar214 - 210 barCodeAdjustmentSScrewdriverKKnobCodePo rt ThreadI3/4 - 16 UNFJ1/2 BSPINSTALLATION DETAILSD imensions in Millimetres1966 maxKnob Adjustment7RV 5 Pressure Relief ValvePRESSURE RELIEF VALVES limit the maximumworking Pressure of a Hydraulic system to a pre-determined rating thus providing protection against theoverloading of system acting relief valves unload flow to tank whensystem Pressure is sufficient to compress a springwhich unseats a poppet.

6 They have a high tolerance tocontamination and are generally used for low flow rateswhere precise Pressure Control is not Pressure :276 barMaximum Flow:70 lpmPorting:3/4 BSPM aterial:steel cartridge in high tensile aluminium : kgSymbolQuality Hydraulic Components from the Webtec RangeFeatures Direct acting in-line relief valve giving hightolerance to contamination. Quick response provides protection against shockloads. Provides protection against thermal expansion offluid. Can be used as a remote Control for a pilotoperated relief valve by substituting for the built indirect acting relief valve of the pilot operated valve. Flow through Pressure ports enable the valve tobe connected in-line with mounting versatility Hydraulic Components from the Webtec RangePressure Port 3/4 BSP6479 Tank Port 3/4 diaPressure Port 3/4 BSP42405059 ORDERING CODEST ypical CodeRV5120RV5 - Valve TypePressure Setting in barbetween100 - 276 bar0154080120160200304560750 Flow (lpm)Inlet Pressure (bar)INSTALLATION DETAILSD imensions in millimetresTYPICAL CHARACTERISTICS(at one Pressure Setting)

7 Curve established using Hydraulic mineral oil with viscosity of centistokes at 49 C9RV 125 Pressure Relief ValvePRESSURE RELIEF VALVES limit the maximumworking Pressure of a Hydraulic system to a pre-determined rating thus providing protection against theoverloading of system acting relief valves unload flow to tank whensystem Pressure is sufficient to compress a springwhich unseats a poppet. Pilot operated valves have abuilt-in direct acting relief valve which, when opened bysystem Pressure , causes a larger spool to movepermitting larger flow rates to return to tank. Pilotoperated relief valves provide more precise pressurecontrol than direct acting Pressure :210 barMaximum Flow:125 lpmPorting:see Table 2, ordering codesMaterial: steel components in high tensile aluminium kgSymbolQuality Hydraulic Components from the Webtec RangeFeatures Cartridges are available providing either directacting for high tolerance to particularcontamination or pilot operation for quiet, smoothand accurate Pressure Control .

8 Relief Pressure is adjustable from 80 - 210 bar bymeans of a screw concealed by a cap unit. A gauge port is provided for the convenience ofthe user. Flow through Pressure ports enable the valve tobe connected in-line with mounting versatility andconvenience without causing ActingPilot Operated10 Quality Hydraulic Components from the Webtec RangeORDERING CODEST ypical CodeRV125 POJ100RV125 - Valve TypeCartridge Type (Table 1)Porting (Table 2) Pressure setting in barbetween 80 - 210 barTable 1:Cartridge TypeTable 2:PortingTYPICAL CHARACTERISTICS(at two Pressure settings for both a direct acting and a pilot operated cartridge)Curve established using Hydraulic mineral oil with viscosity of centistokes at 49 CCodeDescriptionPOPilot Operated CartridgeDADirect Acting CartridgeCodeDescriptionJ3/4 BSPG1 1/16 - 12 UNF(No 12 SAE 0 Ring Ports)Direct ActingDirect ActingPilot OperatedPilot Operated04080120120160200040602080100 Flow (lpm)Inlet Pressure (bar)

9 PressureReturn1536451 Pressure Portsboth sidesGauge Port1/4 BSP51251970121 Remove cap for access toscrewdriver DETAILSD imensions in millimetres11PC 75 Pressure ReliefValve Pilot OperatedPRESSURE RELIEF VALVES limit the maximumworking Pressure of a Hydraulic system to a pre-determined rating thus providing protection against theoverloading of system operated relief valve has built-in direct acting reliefvalves which unload flow to tank when system pressureis sufficient to unseat a spring loaded poppet. Flowthrough the direct acting valve causes a larger spool tomove allowing a larger flow to return to tank. Pilotoperated relief valves are generally used for higher flowrates where Pressure Control is Pressure :210 barMaximum Flow:135 lpmPorting:see Table 5, ordering codesMaterial:steel components in cast iron body Plastic kgSolenoid Voltage:see Table 3, ordering codes(solenoid optional)SymbolQuality Hydraulic Components from the Webtec RangeFeatures Relief Pressure is adjustable by means of arotating Control handle.

10 See Table 2, orderingcodes for adjustment ranges. Screwdriveradjustment is also available. Pilot operation provides quiet, smooth andaccurate Pressure Control . Remote Pressure Control can be obtained byplacing a secondary relief valve in a line to tankconnected to the vent port. Flow can be unloaded to tank at low pressureusing a venting (ex. needle) valve in a line to tankconnected to the vent port. Flow may be remotely unloaded to tank at lowpressure by using the optional solenoid operatedventing Hydraulic Components from the Webtec RangeORDERING CODEST ypical CodePCU75 IZC12 VDC NCJPC - Pressure ControlValve Function (Table 1)- omit if not required75 - Valve SizePressure Range (Table 2)Z - For bar Unloading Spring- omit for Standard bar Unloading SpringC - Design StandardSolenoid Voltage if Solenoid Venting is fitted (Table 3)Solenoid Spool Position (Table 4)Porting (Table 5)Table 1:Valve FunctionsTable 2: Pressure RangeTable 4:Solenoid Spool PositionTable 3:Solenoid VoltageTable 5.