车辆制动装置VehicleBrakingDeviceTYP.pptx

车辆制动装置VehicleBrakingDevice任务六120型控制阀TYPE120CONTROLVALVEZHENGZHOURAILWAYVOCATIONALTECHNICALCOLLEGE主讲人李西安SpeakerLiXi’an

（四）紧急阀theemergencyvalve120型控制阀TYPE120CONTROLVALVE六、紧急阀的作用是在紧急制动时加快制动管的排气（紧急局减作用），使紧急制动的作用可靠，提高紧急制动灵敏度，从而提高紧急制动波速。Thefunctionoftheemergencyvalveistoacceleratetheexhaustofthebrakepipeduringemergencybraking(emergencylocalreductionfunction),ensuringreliableemergencybraking,improvingthesensitivityofemergencybrakingandthusincreasingthespeedofemergencybraking.紧急阀由紧急活塞组成、安定弹簧28、放风阀部、先导阀部以及紧急阀上盖1、紧急阀下盖18和紧急阀体10等零部件组成。Theemergencyvalveconsistsoftheemergencypiston,stabilizingspring28,exhaustvalvesection,pilotvalvesection,aswellastheuppercover1,lowercover18andbody10oftheemergencyvalve.

120型控制阀TYPE120CONTROLVALVE六、组装后，紧急活塞膜板外边缘被紧急阀上盖压紧在紧急阀体上，紧急活塞的上腔经暗道及安装面上的通孔与中间体内的紧急室相通，紧急活塞的下腔通制动管。Afterassembly,theouteredgeoftheemergencypistondiaphragmplateispressedtightlyagainsttheuppercoveroftheemergencyvalvebody.Theupperchamberoftheemergencypistonisconnectedtotheemergencychamberintheintermediatebodythroughahiddenpassageandathrough-holeonthemountingsurface,whilethelowerchamber(stabilizingspringchamber)isconnectedtothebrakepipe.紧急阀就是利用紧急活塞上、下两侧的压力差，控制先导阀、放风阀动作，产生紧急局减作用。Theemergencyvalveusesthepressuredifferencebetweentheemergencychamberandthebrakepipeontheupperandlowersidesoftheemergencypistontocontroltheoperationofthepilotvalveandtheexhaustvalve,generatingtheemergencylocalreductionfunction.紧急活塞杆顶面的异形密封圈稍突出于顶面。平时，在安定弹簧力的作用下，紧急活塞处于上部极端位置，此密封圈与紧急阀盖密贴，紧急活塞杆的轴向孔与上腔被切断，防止紧急室过充气引起意外紧急制动。Thespecial-shapedsealringonthetopsurfaceoftheemergencypistonrodprotrudesslightly.Undernormalcircumstances,undertheactionofthestabilizingspringforce,theemergencypistonisintheupperextremeposition.Thesealringistightlyattachedtotheemergencyvalvecover,theaxialholeo