2 - TCA spa

7VR SERIES VENTABLE RELIEF VALVEPILOT OPERATED7VR150SLIDING SPOOL TYPEPRESSURE (1)PRESSURE (1)2CT1CT2VENT (3)3TANK (2)TANK (2)APPLICATIONFor use in circuits which require relief protection and asolenoid vent feature for unloading and dumpingsystem flow to tank. The external vent port can bereferenced to either a remote pilot section for twopressure systems, or to an external directional valve toallow manual pressure unload.OPERATIONThe valve consists of a ventable relief cartridge and atwo-way normally closed or normally open solenoid.The main section spool spring chamber is referencedto tank, pilot flow across the main section spool causesa pressure inbalance and the spool shifts openallowing inlet flow to tank.SOLENOID VENTINGThe solenoid vent feature allows system flow to bedumped to tank at a minimum pressure drop. When thenormally closed solenoid is energised, pilot flow isbypassed around the relief pilot section to tank and themain section spool is vented fully open dumping inletflow at low pressure (see curve). If a normally opensolenoid is used, the main spool shifts open andcontinuously dumps inlet flow to tank until the solenoidis energised. When the solenoid is energised, it closesand prevents pilot flow causing the main section spoolto close.REMOTE OPERATIONSA two-pressure system is created by connecting aremote pilot section (set at less than main relief settingand isolated by a two-way valve) to the external ventport. The main section spool opens when inletpressure reaches the setting of the remote pilot valve.The vent port can also be connected to a manual twowayvalve. When the two-way valve is opened, thespool is ‘vented’ open and inlet flow is dumped to tank.This feature permits manual unloading of the pump orsystem pressure.Integrated Hydraulics LtdRELIEF VALVEWhen used as a conventional relief valve, the solenoidis closed. When the inlet pressure exceeds the valvesetting, the main section spool opens allowing reliefflow to tank.FEATURESVentable for remote unloading, two-pressure systems.Combined functions simplify circuit. High capacity forrelieving or unloading. Hardened and ground workingparts for long life.SPECIFICATIONSFigures based on: Oil Temp = 40°C Viscosity = 40 cStRated FlowMax SettingWorking PressureCartridge MaterialBody MaterialMounting PositionWeightSeal Kit NumberRecommendedFiltration LevelOperating TempLeakageNominal ViscosityRange100 litres/min (26 US GPM)350 bar (5000 psi)280 bar (4000 psi) Continuous350 bar (5000 psi) IntermittentWorking parts hardened and groundsteel. External steel surfaces zinc platedStandard aluminium (up to 210 bar*)Add Suffix ‘377’ for steel optionUnrestricted1.45 kg (3.2 lbs)SK405 (Nitrile) SK405V (Viton)BS5540/4 Class 18/13(25 micron nominal)-20°C to +90°C35 millilitres/min @ 280 bar5 to 500 cSt*For applications above 210 bar please consult our technical department or use the steel body option.Integrated Hydraulics IncCollins Road, Heathcote Ind. Est., Warwick, CV34 6TF, UK.7047 Spinach Drive, Mentor, Ohio 44060, USATel: +44 (0) 1926 881171 Fax: +44 (0) 1926 315729 Tel: (440) 974 3171 Fax: (440) 974 3170Website: www.integratedhydraulics.comWebsite: www.integratedhydraulics.com2-221.D