PARKER 平衡阀原理和应用简介.pdf

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1、PARKERHYDRAULICCARTRIDGESYSTEMSLoadControlValves-BasicConfidential–PropertyofParkerHannifin–HCSEDivisionLoadControlValvesAlsoCommonlyKnownAs•OvercentreValves•HoseBurstValves•CounterbalanceValves•BoomLockValvesConfidential–PropertyofParkerHannifin–HCSEDivisionFunctionalOve

2、rview-Whatarethey?•Acombinationofareliefvalve,flowcontrolandasequencevalve.•Preventsrunawayofcylinderormotorbymeteringtheflow,sotheloadcanneverrunaheadofthepump.•Lockstheloadandpreventsitfromdrifting,(Lowinternalleakage).•Builtinreliefthatpreventshighpressurebeingtrappedi

3、nthecylinder.•Maximisedefficiencywithlargepilotratios.•Settingindependentofdownstreampressureoptions.Confidential–PropertyofParkerHannifin–HCSEDivisionLoadControlValveCircuitSymbolCylinderPortCheckFeatureReliefFeatureOpt’Vent(E6)PilotPortPilotFeatureValvePortReliefSetting

4、FeatureConfidential–PropertyofParkerHannifin–HCSEDivisionFunctionalDescription–TypicalInternalConstructionParkerConfidential,InternalUseOnly-DoNotShareThisDocumentWithCustomers/SuppliersFunctionalDescription–OperatingModes-CylinderAtRestPILOTPORTVALVECYLINDERPORTATRESTVAL

5、VECYLINDERPORTCLOSEDFunctionalDescription–OperatingModes-CylinderRaisingPILOTPORTVALVECYLINDERPORTRAISINGCHECKPOPPETCYLINDERPORTOPENINGFunctionalDescription–OperatingModes-CylinderLoweringPILOTPORTVALVECYLINDERPORTLOWERINGPOPPETCYLINDERPORTMETERINGOPENINGFunctionalDescrip

6、tion–OperatingModes-ExcessCylinderPressurePILOTPORTVALVEEXCESSPORTCYLINDERPRESSUREPOPPETCYLINDERPORTOPENINGTypicalApplications–WhereUsed:•Wherethereisaloadthatcouldrunaway.•Wherethereisthepossibilityofhosefailurethatcouldcauserunaway.•Wherethereisaneedtolockacylinderinpos

7、itionbutstillhaveoverloadorthermalrelief.•Asadynamicbrakeforacylinderormotor.•Canbeusedonopenorclosedcentresystems.•Ventedvalvecanbeusedwithaproportionaldirectionalvalve.Confidential–PropertyofParkerHannifin–HCSEDivisionCausesofInstability•Largeover-hangingloadsinducingch

8、angesininletorpilotpressure•CylinderSealfriction(extensioncylinder(stick-slip)•Trappedpressureac