換向閥
換向閥是具有兩種以上流動形式和兩個以上油口的 方向控制閥。是實現(xiàn)液壓油流
的溝通、切斷和換向，以及壓力卸載和順序動作控制的閥門。可分為手動換向閥、
電磁換向閥、電液換向閥等。
又稱克里斯閥，閥門的一種，具有多向可調的通道，可適時改變流體流向。
工作時借著閥外的驅動傳動機構轉動驅動軸，帶動搖拐臂，啟動閥板，使工作 流
體時而從左入口通向閥的下部出口，時而人右入口變換通向下部出口，實現(xiàn)了周期 變
換流向的目的。
這種變換閥在石油、化工生產(chǎn)中有著廣泛的應用，在合成氨造氣系統(tǒng)中最為常用。
此外，換向閥還可作成閥瓣式的結構，多用于較小流量的場合。工作時只需轉動手 輪
通過閥瓣來變換工作流體的流向。
閥板式的優(yōu)點是動作準確、自動化程度高、工作穩(wěn)定可靠，但需附設驅動和冷 卻
系統(tǒng)，結構較為復雜；閥瓣式結構則較簡單，多用于流量較小的生產(chǎn)工藝上。
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