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所謂電(dian)站止回閥(fa)就是一種能自(zi)(zi)動阻止流(liu)(liu)體(ti)(ti)倒流(liu)(liu)的閥(fa)門。止回閥(fa)的閥(fa)瓣在流(liu)(liu)體(ti)(ti)壓(ya)力作(zuo)用(yong)下開(kai)啟，流(liu)(liu)體(ti)(ti)從進(jin)(jin)口(kou)(kou)側(ce)(ce)流(liu)(liu)向出口(kou)(kou)側(ce)(ce)。當進(jin)(jin)口(kou)(kou)側(ce)(ce)壓(ya)力低(di)于出口(kou)(kou)側(ce)(ce)時，閥(fa)瓣在流(liu)(liu)體(ti)(ti)壓(ya)差、本身(shen)重(zhong)力等因素(su)作(zuo)用(yong)下自(zi)(zi)動關閉以防止流(liu)(liu)體(ti)(ti)倒流(liu)(liu)。

升(sheng)降式(shi)(shi)止回(hui)(hui)閥的(de)結構一(yi)般(ban)(ban)與截(jie)止閥相(xiang)似，其閥瓣(ban)沿著通道中以線(xian)作升(sheng)降運(yun)動，動作可(ke)靠，但流體阻(zu)力較(jiao)大，適用于輕小口徑(jing)的(de)場合。升(sheng)降式(shi)(shi)止回(hui)(hui)閥可(ke)直通式(shi)(shi)和立式(shi)(shi)兩種。直通式(shi)(shi)升(sheng)降止回(hui)(hui)閥一(yi)般(ban)(ban)只能安(an)裝在(zai)水平管路，而立式(shi)(shi)升(sheng)降止回(hui)(hui)閥一(yi)般(ban)(ban)就安(an)裝在(zai)垂直管路。

電站止(zhi)(zhi)(zhi)回(hui)(hui)閥按結構劃分，可以(yi)分為(wei)升降(jiang)式(shi)(shi)止(zhi)(zhi)(zhi)回(hui)(hui)閥、旋啟式(shi)(shi)止(zhi)(zhi)(zhi)回(hui)(hui)閥和(he)蝶(die)式(shi)(shi)止(zhi)(zhi)(zhi)回(hui)(hui)閥三種。升降(jiang)式(shi)(shi)止(zhi)(zhi)(zhi)回(hui)(hui)閥可分為(wei)立式(shi)(shi)和(he)臥式(shi)(shi)兩種。旋啟式(shi)(shi)止(zhi)(zhi)(zhi)回(hui)(hui)閥分為(wei)單瓣(ban)(ban)式(shi)(shi)、雙瓣(ban)(ban)式(shi)(shi)和(he)多瓣(ban)(ban)式(shi)(shi)三種。蝶(die)式(shi)(shi)止(zhi)(zhi)(zhi)回(hui)(hui)閥為(wei)直通式(shi)(shi)、以(yi)上幾種止(zhi)(zhi)(zhi)回(hui)(hui)閥在連(lian)(lian)接形式(shi)(shi)上可分為(wei)螺紋(wen)連(lian)(lian)接、法(fa)蘭連(lian)(lian)接和(he)焊接三種。