2 - TCA spa

1UL60 / 1PUL60 UNLOADING VALVEPILOT OPERATED - SLIDING SPOOL TYPE1UL601UNLOADS TO TANKTANK (2)PILOT (3)3INLET (1)21PUL60UNLOADS TO ASECONDARY SYSTEMSYSTEM (2)DRAIN (3)PILOT (4)14 3INLET (1)2APPLICATIONThese unloader valves are used to unload a pump, orpumps, to tank when pressure in a separate part of thecircuit reaches a pre-set level. The valves will close,causing the circuit to reload, when the pressure dropsto approximately 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). The 1PUL60 valve has a drain port to ensurecorrect valve function while allowing the bypassed oil tobe used for a secondary circuit requirement.SPECIFICATIONSFigures based on: Oil Temp = 40°C Viscosity = 40 cStRated FlowMax SettingDifferentialUnload/ReloadCartridge Material60 litres/min (16 US GPM)350 bar (5000 psi)10-15%All working parts hardened andground steel. External surfaces zincplatedBody MaterialStandard SteelOPERATIONMounting PositionUnrestricted12Inlet 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 to 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.FEATURESValves are available as cartridges for installation intospecial line 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 use in accumulator circuits.Bodied valves include a check valve and the requiredconnection from the system to the valve pilot port.Cavity NumberTorque Cartridgeinto CavityWeightSeal Kit NumberRecommendedFiltration LevelOperating TempLeakageNominal ViscosityRange1UL601PUL6075 Nm (55 lbs ft)1UL60/1PUL60 0.46 kg (1.01 lbs)1UL65/1PUL65 0.8 kg (1.76 lbs)1UL601PUL60-20°C to +90°C5 to 500 cStA3146(See Section 17)A12088SK451 (Nitrile)SK451V (Viton)SK750 (Nitrile)SK750V (Viton)BS5540/4 Class 18/13(25 micron nominal)35 millilitres/min nominalIntegrated 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.com12-111.D