2 - TCA spa

1PUL2001PUL200 PRIORITY UNLOADING VALVEPILOT OPERATED - SLIDING SPOOL TYPE1OUTLET (2)DRAIN (3)PILOT (4)4 3INLET (1)2APPLICATIONThese unloader valves are used to divert pump flow toa secondary circuit when pressure in the priority linereaches a pre-set level. The valves will close, causingthe circuit to reload, when the pressure drops toapproximately 85% of the unload pressure. The mostcommon application is to maintain a pressure in anaccumulator which may be used in an emergency tooperate an essential hydraulic function (eg, a brakecircuit). This valve has a drain port to ensure correctvalve function while allowing the bypassed oil to beused for a secondary circuit requirement.SPECIFICATIONSFigures based on: Oil Temp = 40°C Viscosity = 40 cStRated FlowMax SettingDifferentialUnload/ReloadCartridge Material200 litres/min (52 US GPM)350 bar (5000 psi)10-15%All working parts hardened andground steel. External surfaces zincplated12OPERATIONInlet pressure is seen on the nose of the valve andsystem pressure (downstream of the system checkvalve) operates on the system pilot port. Whenpressure rises to the valve setting, the relief sectionopens and the system pressure acts on the pilot pistonto hold the valve in the open position. The ratio betweenthe pilot piston diameter and the seat diameter of therelief valve pilot section ensures that the valve will bemaintained in the fully open position until the systempressure drops to approximately 85% of the unloadpressure.FEATURESBody MaterialMounting PositionCavity NumberTorque Cartridgeinto CavityWeightSeal Kit NumberStandard steelUnrestrictedA3145 (See Section 17)100 Nm (73 lbs ft)1PUL200 0.74 kg (1.63 lbs)1PUL250 6.8 kg (14.96 lbs)1PUL2001PUL250SK670 (Nitrile)SK670V (Viton)SK452 (Nitrile)SK452V (Viton)Valves are available as cartridges for installation intoline bodies or into custom designed HydraulicIntegrated Circuits. (NOTE: Provision must be made fora system check valve and a pilot line to signal thesystem pressure). Valve assemblies can be suppliedcomplete in a line body for ready installation into ahydraulic system. Bodied valves include a check valveand the required connection from the system to thevalve pilot port.RecommendedFiltration LevelOperating TempLeakageNominal ViscosityRangeBS5540/4 Class 18/13(25 micron nominal)-20°C to +90°C35 millilitres/min @ 210 bar5 to 500 cStIntegrated Hydraulics LtdIntegrated 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.com12-121.C