安(an)(an)(an)(an)(an)全(quan)閥(fa)(fa)(fa)(fa)(fa)(fa)在系(xi)(xi)統(tong)(tong)(tong)中(zhong)起安(an)(an)(an)(an)(an)全(quan)保(bao)護作用(yong)(yong)。當(dang)(dang)(dang)系(xi)(xi)統(tong)(tong)(tong)壓力(li)超(chao)過(guo)(guo)規定(ding)值時(shi)，安(an)(an)(an)(an)(an)全(quan)閥(fa)(fa)(fa)(fa)(fa)(fa)汀開，將系(xi)(xi)統(tong)(tong)(tong)中(zhong)的一部分氣(qi)體排入大氣(qi)，使系(xi)(xi)統(tong)(tong)(tong)壓力(li)不超(chao)過(guo)(guo)允許值，從而保(bao)證系(xi)(xi)統(tong)(tong)(tong)不因壓力(li)過(guo)(guo)高而發生(sheng)事故(gu)。安(an)(an)(an)(an)(an)全(quan)閥(fa)(fa)(fa)(fa)(fa)(fa)又稱溢流閥(fa)(fa)(fa)(fa)(fa)(fa)。圖示(shi)為(wei)安(an)(an)(an)(an)(an)全(quan)閥(fa)(fa)(fa)(fa)(fa)(fa)的幾種典型結構形式。圖a為(wei)活(huo)塞式安(an)(an)(an)(an)(an)全(quan)閥(fa)(fa)(fa)(fa)(fa)(fa)，閥(fa)(fa)(fa)(fa)(fa)(fa)芯(xin)是一平(ping)板。氣(qi)源壓力(li)作用(yong)(yong)在活(huo)塞A上，當(dang)(dang)(dang)壓力(li)超(chao)過(guo)(guo)由彈簧力(li)確定(ding)的安(an)(an)(an)(an)(an)全(quan)值時(shi)，活(huo)塞A被頂(ding)開，一部分壓縮(suo)空(kong)氣(qi)即從閥(fa)(fa)(fa)(fa)(fa)(fa)口排入大氣(qi)；當(dang)(dang)(dang)氣(qi)源壓力(li)低于(yu)安(an)(an)(an)(an)(an)全(quan)值時(shi)，彈簧驅動活(huo)塞下(xia)移(yi)，關閉閥(fa)(fa)(fa)(fa)(fa)(fa)口。

動(dong)作壓(ya)力范圍：1Kpa-1.2Kpa(劃分(fen)五個等級)

工作介(jie)質：燃氣或(huo)其它無腐蝕(shi)性氣體

工(gong)作溫度： -20-60

通徑(jing)系列(lie)：DN50、DN80、DN100、DN150、DN200、DN250、DN300