液压阀-外文-翻译.doc

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1、毕业设计（论文）外文翻译（2012届）外文题目：Valve译文题目：阀学生姓名：学号：专业班级：机械设计制造及其自动化0806班指导教师：所在学院：机械工程学院ValvesPressure-ControlValvesPressure-controlvalvesareusedinhydrauliccircuitstomaintaindesiredpressurelevelsinvariouspartsofthecircuits.Apressure-controlvalvemaintainsthedesir

2、edpressurelevelsbydivertinghigher-pressurefluidtoalower-pressurearea.Therebylimitingthepressureinthehigher-pressureareabyrestrictingflowintoanotherarea.Valvesthatdivertfluidcanbesafety,relief,counterbalance,sequence,andunloadingtypes.Valvesthatrestrictfl

3、owintoanotherareacanbeofthereducingtype.Apressure-controlvalvemayalsobedefinedaseitheranormallyclosedornormallyopentwo-wayvalve.Relief,sequence,unloadingandcounterbalancevalvesarenormallyclosed,two-wayvalvesthatarepartiallyorfullyopenvalvethatrestrictsan

4、dfinallyblocksfluidflowasecondary.Witheithertypeofoperation,thevalvecanbesaidtocreateautomaticallyanorificetoprovidethedesiredpressurecontrol.Anorificeisnitalwayscreatedunloadingvalve.Itispilotedfromanexternalsource.Onevalveofthistypeistheunloadingvalve.

5、Relief,reducing,counterbalance,andsequencevalvescanbefullyautomaticinoperation.Withtheoperatingsignaltakenfromwithintheenvelop.Inthischapter,weshallstudythedifferenttypesofpressure-controlvalvesandlearnhowtheyareusedinvarioushydrauliccircuits. TypesofPre

6、ssure-ControlValvesEightpopulardevicesforpressure-controlare:Safetyvalve.Usuallyapoppet-typetwo-wayvalveintendedtoreleasefluidtoasecondaryarea.whenthefluidpressureapproachesthesetopeningpressureofthevalve.Thistypeofvalveprotectspipingandequipmentfromexce

7、ssivepressure. Reliefvaluewhichlimitsthemaximumpressurethatcanbeappliedinthatportionofthecircuittowhichitisconnected. Counterbalancevaluewhichmaintainsresistanceagainstflowtoonedirectionbutpermitsfreeflowintheotherdirection. Sequencevaluewhichdirectsflow

8、tomorethanoneportionofafluidcircuitin11sequence.UnloadingvalveValuewhichallowspressuretobuilduptoanadjustablesetting,thenbypassestheflowaslongasaremotesourcemaintainsthepresetpressureonthepilotport.Pressure-reducingvalvewh