资源描述：
《请求删除该文档.ppt》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、FluidPowerTransmissionandControl--ControlComponentsinHydraulicSystemsOutlineIntroductionDirectionalcontrolvalvesPressurecontrolvalvesFluidcontrolvalvesServovalvesHydraulicfusesPressureandtemperatureswitchesShockabsorbersIntroductionDefinedasanydevicebywh
2、ichtheflowoffluidmaybestarted,stopped,orregulatedbyamovablepartthatopensorobstructspassageValvesareclassifiedaccordingtotheiruse:-directionalcontrol-pressurecontrol-flowcontrolValvesmaybecontrolledmanually,electrically,pneumatically,mechanically,hydrauli
3、cally,orbycombinationsoftwoormoreofthesemethodsDirectionalcontrolvalvesUsedtocontrolthedirectionofflowinahydrauliccircuitTwoclasses:one-wayvalves(checkvalves)andmulti-wayvalvesCheckvalves(止回阀,单向阀)SpringPoppet(阀芯,锥阀结构)BodySeat(阀座)ThreadedmountingPermitfre
4、eflowinonedirectionandpreventanyflowintheoppositedirectionCheckvalves(止回阀,单向阀)SubplatemountingPilot-operatedcheckvalves(液控单向阀)PermitfreeflowinonedirectionbutpermitflowinthenormallyblockedoppositedirectiononlyifpilotpressureisappliedControlspoolHousingPop
5、pet(阀芯,截止阀)SpringPilotpressureportPilot-operatedcheckvalvewithoutpilotoildrain(内泄)Pilot-operatedcheckvalves(液控单向阀)Ballpoppetvalve(optional,释压球阀)decompressionreducepilotpressurePoppetSpringPilotoildrain(泄油口)Pilot-operatedcheckvalvewithpilotoildrain(外泄)Pil
6、ot-operatedcheckvalvesUsedfortheisolationofoperatingcircuitswhichareunderpressureFrequentlyasasafeguardagainstcreepingmovementsofhydraulicallylockedactuatorsMulti-waydirectionalcontrolvalves(换向阀)MethodsTypesThenumberofportsinthevalvehousingTwo-way,Three-
7、way,Four-way,…ThenumberofworkingpositionsTwo-position,Three-position,…ThetypeofvalvingelementusedintheconstructionofthevalvePoppet,rotaryspool,andslidingspoolMountingmethodsThreaded,subplate,…OperationmethodsDirectoperated,pilotoperatedActuatingtypesmanu
8、ally,electrically,pneumatically,mechanically,hydraulically,…DirectionalcontrolvalvesDirectionalspoolvalvesDirectionalpoppetvalvesDirectlyoperatedPilotedoperatedDirectlyoperatedPilotedoperatedSlidingspool(滑阀)SlidingspoolSym
