液压与气压传动英汉双语 教学课件 作者 陈淑梅第5章Chapter_5.ppt

《液压与气压传动英汉双语 教学课件 作者 陈淑梅第5章Chapter_5.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Chapter5HydraulicControlValves5.1Introduction5.2DirectionalControlValves5.3PressureOperatedValves5.4FlowControlValves5.5ManifoldValvesandCartridgeValves5.6Electro-HydraulicServoValves5.7Electro-HydraulicProportionalValves5.8Electro-HydraulicDigitalValvesContents5.1Introducti

2、on5.1.1ThebasiccharacteristicsThetypesofcontrolvalvesusedtodayaretoonumeroustobementioned.Mostvalves,however,performthreeprimaryfunctionsinthehydraulicsystem:tocontroltheoilpressure(pressurecontrolvalves),theflowrate(flowcontrolvalves)andthedirectionofoilflow(directionalcont

3、rolvalves)inthesystemtoensuretheactuatorsinproperworkingorderontheloadrequested.Althoughtherearemanytypesofhydrauliccontrolvalvesandtheymightbequitedifferentfromeachotherineitherthefunctionsorconfigurations,thereexistbasiccharacteristics.1.Instructure,allhydrauliccontrolvalv

4、esconstantofthevalvebody,thevalvecore(spool,coneorball)andtheoperationelementsusedtocontrolthevalvecore.ThethreebasictypesofcoresareshowninFig.5-1.2.Inoperationprinciple,theorificeflowformulashouldbekepttruefortheorificesize,thepressuredifferencesbetweentheinletandoutletandt

5、heflowrateofthroughthevalves.Fig.5-1Configurationtypes5.1.2ClassificationThehydrauliccontrolvalvescanbecategorizedaccordingtodifferentclassificationattributes,seeTab.5-1.Tab.5-1ClassificationofhydrauliccontrolvalvesTab.5-1Classificationofhydrauliccontrolvalves5.1.3Basicrequi

6、rementsforhydraulicvalves1.Sensitive,credible,andlowimpactandvibration;2.Lowresistancewhentheorificeisopenedcompletely,andhasgoodsealingabilitywhentheorificeisclosed;3.Controllableparameters(suchasthepressureandtheflowrate)shouldbestableandinsensitiveunderdisturbance.4.Compa

7、ctinstructureandgoodininstallation,adjustmentandapplications.5.2DirectionalControlValvesTherearetwotypesofgeneraldirectionalcontrolvalves:in-linecheckanddirectionchanging.5.2.1In-lineCheckThein-linecheckvalvesinclude:thegeneraltypechecksandhydraulicoperatedcheckvalves.1.Theg

8、eneraltypein-linecheckvalvesFunctions:Thisvalveallowsfreeflowinonedirection