止回閥

止回閥又稱單向閥或逆止閥，其感化是避免管路中的介質倒流。水泵吸水管的底閥也屬于止回閥類。
啟閉件靠介質活動和氣力自行開啟或封閉，以避免介質倒流的閥門叫止回閥。止回閥屬于主動閥類，首要用于介質單向活動的管道上，只許可介質向一個標的目的活動，以避免產生變亂。
止回閥按(an)布局(ju)分(fen)別，可分(fen)為(wei)(wei)起落式(shi)(shi)(shi)(shi)(shi)(shi)止(zhi)(zhi)回(hui)閥(fa)(fa)(fa)、旋(xuan)(xuan)啟式(shi)(shi)(shi)(shi)(shi)(shi)止(zhi)(zhi)回(hui)閥(fa)(fa)(fa)和(he)蝶式(shi)(shi)(shi)(shi)(shi)(shi)止(zhi)(zhi)回(hui)閥(fa)(fa)(fa)三種。起落式(shi)(shi)(shi)(shi)(shi)(shi)止(zhi)(zhi)回(hui)閥(fa)(fa)(fa)可分(fen)為(wei)(wei)立(li)式(shi)(shi)(shi)(shi)(shi)(shi)和(he)臥式(shi)(shi)(shi)(shi)(shi)(shi)兩種。旋(xuan)(xuan)啟式(shi)(shi)(shi)(shi)(shi)(shi)止(zhi)(zhi)回(hui)閥(fa)(fa)(fa)分(fen)為(wei)(wei)單瓣式(shi)(shi)(shi)(shi)(shi)(shi)、雙(shuang)瓣式(shi)(shi)(shi)(shi)(shi)(shi)和(he)多瓣式(shi)(shi)(shi)(shi)(shi)(shi)三種。蝶式(shi)(shi)(shi)(shi)(shi)(shi)止(zhi)(zhi)回(hui)閥(fa)(fa)(fa)為(wei)(wei)縱貫(guan)式(shi)(shi)(shi)(shi)(shi)(shi)、以上幾種止(zhi)(zhi)回(hui)閥(fa)(fa)(fa)在毗連(lian)(lian)情勢上可分(fen)為(wei)(wei)羅(luo)紋毗連(lian)(lian)、法蘭毗連(lian)(lian)和(he)焊接三種。

API美標止回閥

H41起落式止回閥

H42立式止回閥

H44旋啟式止回閥

H44鑄鐵止回閥