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CETOP 03 OVERCENTRE STACKING SLICESPILOT ASSISTED RELIEF WITH CHECK03*CE/ 03*CER/ 03*CEB11133314APPLICATIONOvercentre valves give static and dynamic control of loadsby regulating the flow into and out of hydraulic actuators.When installed close to or within an actuator, theovercentre valve will stop runaway in the event of hoseburst and if open centre directional control valves are used,will allow thermal expansion relief of the hydraulic fluid.Single overcentre valves are normally used when the loadis unidirectional, for example an aerial platform or craneand dual overcentre valves are used for controlling loadsin both directions for motor applications or for cylindersgoing over centre.The 1CER series overcentre valve performs all duties of aregular overcentre but is able to relieve and stay openirrespective of downstream pressure. This enables thevalve to operate when used with a closed centre directionalvalve which has service line reliefs. The poppet ispressure balanced, preventing relief setting increase dueto back pressure.--In the 1CEB series pressure balanced overcentre reliefsetting is unaffected by back pressure, enabling the valveto stay open when the valve port pressure rises. This willallow the control of regenerative or meter out proportionalsystems.OPERATIONThe check section allows free flow into the actuator thenholds and locks the load against movement. The pilotassisted relief valve section will give controlled movementwhen pliot pressure is applied. The relief section isnormally set to open at a pressure at least 1.3 times themaximum load induced pressure but the pressurerequired to open the valve and allow movement dependson the pilot ratio of the valve. For optimisation of loadcontrol and energy usage, a choice of pilot ratios isavailable.The pressure required to open the valve and start actuatormovement can be calculated as follows:Pilot Pressure = (Relief Setting) - (Load Pressure)Pilot RatioFEATURESIntegrated Hydraulics Ltd22ATMOSPHERICVENT03*CE 03*CER 03*CEBCartridge is economical and fits simple cavity. Allows quick,easy field service - reduces down time.PILOT RATIOS1CE302.5:1 Best suited for extremely unstable applicationssuch as long booms or flexible frameworks.5:1(Std)SPECIFICATIONSFigures based on: Oil Temp = 40°C Viscosity = 40 cSt2Best suited for applications where load variesand machine structure can induce instability10:1 Best suited for applications where the loadremains relatively constant.1CER304:1 Best suited for applications where the loadremains relatively constant.Other ratios available upon request.1CEB305:1 Best suited for systems where back pressurevaries frequently and for re-generativesystems.Rated FlowMax SettingCartridge MaterialBody MaterialMounting PositionCavity NumberTorque Cartridgeinto CavityWeight(inc Cartridges)Seal Kit NumberRecommendedFiltration LevelOperating TempLeakage30 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)SingleDualSK395 (Nitrile)-20°C to +90°C0.62 kg (1.36 lbs)0.8 kg (1.76 lbs)BS5540/4 Class 18/13(25 micron nominal)Nominal Viscosity5 to 500 cStRangeFor pressure drop curves please see section 6 (cartridgeonly).Integrated Hydraulics IncSK395V (Viton)0.3 millilitres/min nominal (5 dpm)Collins 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.com14-111.D