項目3 任務(wù) 3 流量控制閥的認(rèn)知

流量控制閥的認(rèn)知KnowledgeaboutFlowControlValve任務(wù)3Task3任務(wù)描述TaskDescription1了解常見流量控制閥的基本工作原理及符號，進(jìn)一步熟悉流量控制閥的種類，熟悉常見流量控制閥在不同場合的應(yīng)用。Taskdescription:Understandthebasicworkingprinciplesandsymbolsofcommonflowcontrolvalves,beacquaintedwiththetypesofflowcontrolvalves,andbefamiliarwiththeapplicationsofflowcontrolvalvesindifferentscenarios.流量控制閥通過改變閥口通流面積來調(diào)節(jié)輸出流量，從而控制執(zhí)行元件的運(yùn)動速度。常用的流量控制閥有節(jié)流閥和調(diào)速閥兩種。Aflowcontrolvalveregulatestheoutputflowbychangingthepassageareaofitsport,therebycontrollingthemovementspeedofanactuator.Therearetwotypesofcommonlyusedflowcontrolvalves:throttlevalveandspeedregulatingvalve.節(jié)流閥ThrottleValve2工作原理：Workingprinciple:打開節(jié)流閥時，壓力油從進(jìn)油口P1進(jìn)入，經(jīng)孔a、閥芯2左端的軸向三角槽以及孔b和出油口P2流出。閥芯在彈簧力的作用下始終緊貼在推桿3的端部。旋轉(zhuǎn)手輪4，可使推桿沿軸向移動，以改變節(jié)流口的通流面積，從而調(diào)節(jié)通過閥的流量。Whenthethrottlevalveisopened,pressurefluidflowsinfromthefluidinletP1andflowsoutthroughholea,axialtriangulargrooveattheleftendofthevalveelement(2),holebandfluidoutletP2.Thevalveelementisalwayspressedagainsttheendofthepushrod(3)undertheactionofspringforce.Whenthehandwheel(4)isrotated,thepushrodmovesintheaxialdirectiontochangethepassageareaofthethrottleport,therebyregulatingtheflowthroughthevalve圖3-3-1普通節(jié)流閥

Figure3-3-1OrdinaryThrottleValve1-彈簧2-閥芯3-推桿4-手輪a、b-孔1-Spring2-ValveElement3-PushRod4-HandWheela,b-Hole調(diào)速閥的工作原理及特點(diǎn)WorkingPrincipleandCharacteristicsofSpeedRegulatingValve3

1調(diào)速閥Speedregulatingvalve圖3-3-2調(diào)速閥

Figure3-3-2Speedregulatingvalve（a）工作原理圖（b）職能符號（c）簡化職能符號（d）特性曲線(a)WorkingPrincipleDiagram(b)FunctionalSymbol(c)SimplifiedFunctionalSymbol(d)CharacteristicCurve1-減壓閥2-節(jié)流閥1-Reliefvalve2-Throttlevalve流量控制閥的常見故障及其排除方法CommonFaultsofFlowControlValvesandTroubleshooting4

Table3-3-1CommonFaultsofFlowControlValvesandTroubleshootingMethodsFaultSymptomCauseAnalysisTroubleshootingMethodNofloworverylittleflow(1)Thethrottleportisblockedorthevalveelementisstuck(2)Thefitclearancebetweenthevalveelementandthevalveholeistoolarge,withmuchleakage(1)Checkandcleanit,replacefluid,improvefluidcleanliness,andrepairthevalveelement(2)Checkthewearandsealingconditions,andrepairorreplacethevalveelementUnstableflow(1)Foreignparticlesinthefluidadheretotheedgeofthethrottleport,resultingindecreasedpassagesectionandlowerspeed(2)Thethrottlevalvehasmuchleakageoffluidinsideoroutsideitandtheflowlossishighsothattheflowrequiredfortherunningspeedcannotbeguaranteed(1)Disassembleandcleanthethrottlevalve,removedirt,andreplacethefluidfilterorfluid(2)Checkthegapbetweenthevalveelementandthevalvebodyaswellastheirmachiningaccuracy,repairorreplaceout-of-toleranceparts,andcheckthesealingconditionofrelevantconnectingpartsorreplacesealingparts任務(wù)實施Taskimplementation51畫出設(shè)備上的流量控制閥的圖形符號。Drawthegraphicsymbolsofflowcontrolvalvesonequipment.2能熟練調(diào)節(jié)流量控制閥對油路的流量進(jìn)行調(diào)節(jié)。Proficientlyadj