300X缓闭止回阀结构特点和用途300X缓闭止回阀由主阀、单向阀、针阀、球阀、微形过滤器和压力表组成水力控制接管系统。利用水力自动操作，可使主阀得到最佳的开启或关闭速度。防止水锺水击的产生，以达到缓闭消声的效果。本产品利用水力自力控制，不需要其它装置和能源，保养简便，开启及缓闭平稳。本系列阀门产品广泛用于高层建筑、生活区等供水管网系统及城市供水工程。工作原理当阀门从进口端给水时，水通过微型过滤器、针阀、单向阀进入主阀控制室，再经过球阀排水至下游。因为针阀开度小于球阀开度，即主阀控制室的排水速度大于进水速度，因此控制室压力降低，作用于主阀盘下端的进口压力打开主阀向下游供水。当管道停止供水时，若下游水开始回流，一部分回流水经球阀进入主控制室，由于单向阀作用，回流水不能从主控制室流出，引起主控制室逐渐升压，缓缓关闭主阀。主要技术参数公称压(Mpa)壳体试验压力(MPa)密封试验压力(MPa)适用介质介质温度(℃)1.01.51.1水0-801.62.41.762.53.752.75主要零件材料零件名称零件材料阀体阀盖WCB阀座阀盘铜合金密封圈O型圈丁腈橡胶阀杆2Cr13弹簧50CrVA针型阀铜合金球阀铜合金浮球阀铜合金微型过滤器不锈钢部件列表：1、针阀2、主阀3、球阀4、压力表5、单向阀连接尺寸DNLAA1HH1FDmmD1mmD2mmn-ΦdmmmmmmmmmmmmPN1.0PN1.6PN2.5PN1.0PN1.6PN2.5PN1.0PN1.6PN2.5PN1.0PN1.6PN2.5201802822001721061161051051057575755858564-13.54-13.54-14251802822001721061161151151158585856868654-13.54-13.54-14321802822001721061161401401401001001007878764-17.54-17.54-18402403202102652101701501501501101101108888844-17.54-17.54-1850240320210265210170165165165125125125102102994-17.54-17.54-18652503302153102151801851851851451451451221221184-17.54-17.58-18802853502203502452102002002001601601601331331328-17.58-17.58-181003604102304603052752202202351801801901581581568-17.58-17.58-221254004202455203653102502502702102102201841841848-17.58-17.58-261504554302605704153552852853002402402502122122118-228-228-262005854402806955104603403403602952953102682682748-2212-2212-2625065045030078056050039540542535035537032032033012-2212-2612-3030080046032090265858044546048540041043037037038912-2212-2616-30350860470340102569664050552055546047049043043044816-2216-2616-33400960480360108073571556558062051552555048248250316-2616-3016-364501075530395103061078061564067056558560053255054820-2620-3020-365001075580420113566583067071573062065066058558560920-2620-3320-366001230600445127072592078084084572577077068568572020-3020-3620-397001650730495146086598089591096084084087580080082024-3024-3624-4280017508305301640925105010151025108595095099090590592824-3324-3924-48安装示意图)