飞机液压系统活门介绍.ppt

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1、BasicAircraftsystemValvesofAircraftHydraulicSystemBasicAircraftSystems—hydraulicsystemHYDRAULICSYSTEMVALVESThevalvesusedinhydraulicsystemsmaybedividedinto:Flow-controlvalves.Aflow-controlvalveselectstherouteofflowofthefluidthroughthesystem,andisnotnormallyconcernedwiththepressure.Press

2、ure-controlvalvesOntheotherhand,pressure-controlvalvesadjust,regulate,orlimittheamountofpressureinthesystem,orinanyportionofthesystem.BasicAircraftSystems—hydraulicsystemHYDRAULICSYSTEMVALVESFLOWCONTROLVALVESForhydrauliccomponentsandsystemstooperateasintended,theflowoffluidmustberigidl

3、ycontrolled.Fluidmustbemadetoflowaccordingtodefiniteplans.Manykindsofvalveunitsareusedforexercisingsuchcontrol.1.selectorvalves(选择活门)2.checkvalves(单向活门)3.sequencevalves(顺序活门)4.priorityvalves(优先活门)5.quickdisconnectvalve(快断活门)6.hydraulicfuses(液压保险)BasicAircraftSystems—hydraulicsystemVALV

4、ES-SELECTORVALVESSelectorValvesOneofthemostfamiliarflow-controlvalvesistheselectorvalve,whichdeterminesthedirectionofflowoffluidtoretractorextendthelandinggear,ortoselectthepositionofthewingflaps.Twocommonlyusedtypesofselectorvalves:BasicAircraftSystems—hydraulicsystemVALVES-SELECTORVA

5、LVESSelectorValvesOpen-centervalveTheopen-centervalvedirectsfluidthroughthecenterofthevalvebacktothereservoirwhenaunitisnotbeingactuated.Closed-centervalveTheclosed-centervalvestopstheflowoffluidwhenitisinitsneutralposition.Bothvalvesdirectfluidfromthepumptoonesideoftheactuatorandventt

6、heoppositesidetothereservoir.BasicAircraftSystems—hydraulicsystemVALVES-SELECTORVALVESOpen-centervalveTheopen-centervalveisanopen-centerpoppet-typeselectorvalveutilizedinanopen-centerhydraulicsystem(referbacktoFigure8-17).Whentheselectorhandleisintheneutralposition,theappropriatepoppet

7、isoffofitsseat.Fluidflowsstraightthroughthevalvefromthepumptothenextselectorvalveandontothereservoir.[Figure8-37,view(A)]BasicAircraftSystems—hydraulicsystemVALVES-SELECTORVALVESOpen-centervalveWhentheactuatorreachestheendofitstravel,thepumpcontinuestoproduceaflowoffluid.Asystemrelie