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消(xiao)防(fang)閥(fa)(fa)(fa)(fa)(fa)門(men)是(shi)為了阻止火(huo)(huo)(huo)災時火(huo)(huo)(huo)勢(shi)和(he)有(you)毒高溫(wen)(wen)煙(yan)(yan)(yan)(yan)氣通(tong)過風(feng)(feng)(feng)(feng)管(guan)(guan)蔓延擴大，在通(tong)風(feng)(feng)(feng)(feng)、空(kong)調(diao)系(xi)(xi)統(tong)(tong)(tong)的(de)(de)風(feng)(feng)(feng)(feng)管(guan)(guan)上需(xu)設(she)有(you)消(xiao)防(fang)防(fang)火(huo)(huo)(huo)閥(fa)(fa)(fa)(fa)(fa) 消(xiao)防(fang)防(fang)火(huo)(huo)(huo)閥(fa)(fa)(fa)(fa)(fa)按(an)其功(gong)能(neng)可分為：防(fang)火(huo)(huo)(huo)閥(fa)(fa)(fa)(fa)(fa)、排(pai)煙(yan)(yan)(yan)(yan)防(fang)火(huo)(huo)(huo)閥(fa)(fa)(fa)(fa)(fa)、排(pai)煙(yan)(yan)(yan)(yan)閥(fa)(fa)(fa)(fa)(fa) 防(fang)火(huo)(huo)(huo)閥(fa)(fa)(fa)(fa)(fa)安(an)裝(zhuang)在有(you)防(fang)火(huo)(huo)(huo)要求的(de)(de)通(tong)風(feng)(feng)(feng)(feng)空(kong)調(diao)系(xi)(xi)統(tong)(tong)(tong)管(guan)(guan)道(dao)(dao)上（防(fang)止火(huo)(huo)(huo)勢(shi)沿風(feng)(feng)(feng)(feng)道(dao)(dao)蔓延），他的(de)(de)功(gong)能(neng)有(you)：溫(wen)(wen)度(du)熔斷(duan)器在70℃時熔斷(duan)，閥(fa)(fa)(fa)(fa)(fa)門(men)關閉，輸(shu)出閥(fa)(fa)(fa)(fa)(fa)門(men)關閉信(xin)號，通(tong)風(feng)(feng)(feng)(feng)空(kong)調(diao)系(xi)(xi)統(tong)(tong)(tong)風(feng)(feng)(feng)(feng)機(ji)(ji)停機(ji)(ji)。 排(pai)煙(yan)(yan)(yan)(yan)防(fang)火(huo)(huo)(huo)閥(fa)(fa)(fa)(fa)(fa)安(an)裝(zhuang)在排(pai)煙(yan)(yan)(yan)(yan)、防(fang)火(huo)(huo)(huo)要求的(de)(de)排(pai)煙(yan)(yan)(yan)(yan)系(xi)(xi)統(tong)(tong)(tong)管(guan)(guan)道(dao)(dao)上（設(she)于排(pai)煙(yan)(yan)(yan)(yan)風(feng)(feng)(feng)(feng)機(ji)(ji)吸入口處管(guan)(guan)道(dao)(dao)上），它的(de)(de)基本功(gong)能(neng)除了具(ju)有(you)排(pai)煙(yan)(yan)(yan)(yan)閥(fa)(fa)(fa)(fa)(fa)的(de)(de)功(gong)能(neng)外還具(ju)有(you)當排(pai)煙(yan)(yan)(yan)(yan)溫(wen)(wen)度(du)超過280℃時熔斷(duan)，使(shi)閥(fa)(fa)(fa)(fa)(fa)門(men)關閉，排(pai)煙(yan)(yan)(yan)(yan)機(ji)(ji)同(tong)時停機(ji)(ji)。 排(pai)煙(yan)(yan)(yan)(yan)閥(fa)(fa)(fa)(fa)(fa)安(an)裝(zhuang)在高層建(jian)筑(zhu)(zhu)、地(di)下建(jian)筑(zhu)(zhu)排(pai)煙(yan)(yan)(yan)(yan)系(xi)(xi)統(tong)(tong)(tong)的(de)(de)管(guan)(guan)道(dao)(dao)上，它的(de)(de)基本功(gong)能(neng)有(you)：感(gan)溫(wen)(wen)（煙(yan)(yan)(yan)(yan)）電(dian)信(xin)號聯(lian)動(dong)(dong)，排(pai)煙(yan)(yan)(yan)(yan)風(feng)(feng)(feng)(feng)機(ji)(ji)同(tong)時啟運；手動(dong)(dong)使(shi)閥(fa)(fa)(fa)(fa)(fa)門(men)開(kai)啟，排(pai)煙(yan)(yan)(yan)(yan)風(feng)(feng)(feng)(feng)機(ji)(ji)同(tong)時啟動(dong)(dong)；輸(shu)出閥(fa)(fa)(fa)(fa)(fa)門(men)開(kai)啟信(xin)號。