Load Sensing Principle of Operation

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1、Eaton®No.03-206November1992MediumDutyPistonPumpsLoadSensingSystemsPrincipleofOperationLoadSensingPrincipleofOperationPageTheInception......................................3WhatisLoadSensing?..........................4HowLoadSensingWorks......................

2、.5AdvantagesofLoadSensing..................14DevelopmentandTesting.....................25ComparisonofSystems.......................26Applications.....................................27FutureofLoadSensingSystems.............272LoadSensingPrincipleofOperationI

3、nthelate1960’ssomeyoungengi-desired,butonlylowworkingpressureneersponderedtheadvantagesandisrequired.Theclosedcentersystemdisadvantagesofhydraulicsystems.takeshighpressuredropsundertheseTheopencenterhydraulicsystem,conditionsandgeneratesexcessiveusingafixedd

4、isplacementgearpump,heatduringthisenergywastingprovidesafixedflowofoil.Systemprocess.pressureisdictatedbytheresistancetoflowinthehydraulicsystem.AhighTheengineersthoughttheremustbeapressurereliefvalveisnecessarytobetterwayofcombiningtheadvan-controlthemaximu

5、msystempressure;tagesofbothsystems.Theidealwhenthesystemreachesmaximumsystemwouldprovideonlytheflowpressure,fullpumpflowisbypassedrequired,atthepressurerequired,tothroughthereliefvalve,consumingoperatethehydraulicsystem.Variableexcesshorsepowerandgeneratingp

6、ressureandvariableflowaredesir-excessiveheatinthesystem.able,yetneithertheopencenterorclosedcentersystemoffertheseTheclosedcentersystem,ontheotherfeatures.Thesolutionrequiredthehand,offerstheadvantageofvariabledevelopmentofanewpumpthatcouldflowfromzerotofull

7、flowandelimi-delivervariableflowandvariablenatestheneedforthesystemreliefpressureasdictatedbythehydraulicvalve.Maximumpressureiscontrolledsystem.Obviously,avariablepistonbythepumpcompensatorthatpumpwasanidealbasicpumptostartdestrokesthepumpandcutsoffthewithb

8、ut,howdoyoumakeitrespondflowtothesystemwhenthehydraulictobothvariables?systemstallsoutduetoanoverloadcondition.ThepumpwillstandbyatOneoftheengineersonthisprojecthighpressure,maintainingthemaxi-d