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止回(hui)閥的(de)(de)英文名稱為One-way valve，又稱單向閥或逆止閥。止回(hui)閥的(de)(de)作用(yong)是防止管路中的(de)(de)介(jie)質倒流(liu)。水泵(beng)吸水關的(de)(de)底閥也(ye)屬于止回(hui)閥類。

　 止(zhi)回(hui)(hui)(hui)閥(fa)按結構劃分(fen)可(ke)分(fen)為(wei)(wei)升降式(shi)(shi)(shi)(shi)止(zhi)回(hui)(hui)(hui)閥(fa)、旋(xuan)啟式(shi)(shi)(shi)(shi)止(zhi)回(hui)(hui)(hui)閥(fa)和(he)(he)蝶(die)式(shi)(shi)(shi)(shi)止(zhi)回(hui)(hui)(hui)閥(fa)三種。升降式(shi)(shi)(shi)(shi)止(zhi)回(hui)(hui)(hui)閥(fa)可(ke)分(fen)為(wei)(wei)立式(shi)(shi)(shi)(shi)和(he)(he)臥式(shi)(shi)(shi)(shi)兩種。旋(xuan)啟式(shi)(shi)(shi)(shi)止(zhi)回(hui)(hui)(hui)閥(fa)分(fen)為(wei)(wei)單瓣(ban)式(shi)(shi)(shi)(shi)、雙瓣(ban)式(shi)(shi)(shi)(shi)和(he)(he)多瓣(ban)式(shi)(shi)(shi)(shi)三種。蝶(die)式(shi)(shi)(shi)(shi)止(zhi)回(hui)(hui)(hui)閥(fa)為(wei)(wei)直通式(shi)(shi)(shi)(shi)、以上(shang)幾種止(zhi)回(hui)(hui)(hui)閥(fa)在連(lian)接形式(shi)(shi)(shi)(shi)上(shang)可(ke)分(fen)為(wei)(wei)螺(luo)紋連(lian)接、法蘭(lan)連(lian)接和(he)(he)焊接三種。