2 - TCA spa

1CEB SERIES OVERCENTRE VALVEFULLY BALANCED - PILOT ASSISTED1CEB30POPPET RELIEF1VALVE (2)PILOT (3)VENT3CYL (1)2ATMOSPHERICVENT6APPLICATIONOvercentre valves give static and dynamic control ofloads by supplying a counterbalance pressure to theactuator. They prevent runaway in the event of hoseburst and hold the load with minimal leakage.The pressure balanced valve is unaffected by backpressure, allowing service line reliefs to operate andfor the valve to be used in regenerative or proportionalvalve systems.The overcentre valve should be mounted either into,onto or as close to the actuator as possible to givemaximum protection.Single overcentre valves control unidirectional loadssuch as in aerial platforms, cranes or winches anddual overcentres are suited to bi-directional motionsuch as wheel motor applications or cylinders goingover centre.OPERATIONThe check section allows free flow into the actuatorthen holds and locks the load against movement. Thepilot assisted relief valve section will give controlledmovement when pliot pressure is applied. The reliefsection is normally set to open at a pressure at least1.3 times the maximum load induced pressure but thepressure required to open the valve and allowmovement depends on the pilot ratio of the valve. Foroptimisation of load control and energy usage, achoice of pilot ratios is available.The pressure required to open the valve and startactuator movement can be calculated as follows:Pilot Pressure = (Relief Setting) - (Load Pressure)Pilot RatioPILOT RATIO5:1SPECIFICATIONSFigures based on: Oil Temp = 40°C Viscosity = 40 cStRated FlowMax SettingCartridge MaterialBody MaterialMounting PositionCavity NumberTorque Cartridgeinto CavityWeightSeal Kit NumberRecommendedFiltration LevelOperating TempLeakageNominal ViscosityRange30 litres/min (8 US GPM)Max Load InducedPressure: 270 bar (4000 psi)Relief Setting: 350 bar (5000 psi)Working parts hardened and groundsteel. External surfaces zinc platedStandard aluminium (up to 210 bar*)Add suffix ‘377’ for steel optionUnrestrictedA6610 (See Section 17)45 Nm (33 lbs ft)1CEB301CEB351CEEB34SK395 (Nitrile)-20°C to +90°C5 to 500 cSt0.14 kg (0.30 lbs)0.40 kg (0.88 lbs)0.88 kg (1.94 lbs)BS5540/4 Class 18/13(25 micron nominal)SK395V (Viton)0.3 millilitres/min nominal (5 dpm)FEATURESCartridge is economical and fits simple ‘dual purpose’cavity. Allows quick, easy field service - reduces downtime. Directly interchangeable with 30 litres/min pilotcheck valve. See page 7-151.Integrated Hydraulics LtdNote, This valve is not suitable for high frequencyapplications and aggressive environmental conditions.*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.com6-131.D