隔膜閥是一種特殊形式的截斷閥，其啟閉件是一塊用軟質材料制成的隔膜，它將閥體內腔與閥蓋內腔隔開。隔膜閥實際上不過是“鉗夾”的閥，一個彈性的，可擾的膜片，用螺椿連接在壓縮件上，壓縮件是由閥桿所操作而上下移動，當壓縮件上升，膜片就高舉，而造成通路，當壓縮件下降，膜片就壓在閥體堰上(假使為堰式閥)或壓在輪廓的底部(假使為直通式)，隔膜閥適用于開關及節流之用。

隔膜閥本身結構設計的原因特適合于超純介質或污染嚴重，十分粘稠的液體、氣體、腐蝕性或惰性介質。與控制設備相結合時，隔膜閥更能取代其它傳統控制系統，尤其是適用于固體和易污染的惰性介質。產品主要應用于生物制藥、食品、行業;以及電力、化工、電鍍、等行業的工業水處理中,還被應用于半導體晶圓的生產中,隔膜閥是特別適用于運送有腐蝕性，有粘性的流體，例如泥漿、食品、藥品、織維性粘合液等，因管線中，隔膜閥的操作機構，是不暴露在運送流體中，故不具污染性，也不需要填料，閥桿填料部也不可能會泄漏。

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