隔膜閥是一種特別情勢的截斷閥，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，壓縮件是由閥桿所把持而高低移動，當壓縮件上升，膜片就高舉，而造成通路，當壓縮件降落，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），隔膜閥實用于開關及節流之用。

隔膜閥本身結構設計的原因特合適于超純介質或污染嚴重，十分粘稠的液體、氣體、腐化性或惰性介質。與把持設備相聯合時，隔膜閥更能代替其它傳統把持系統，尤其是實用于固體和易污染的惰性介質。產品重要利用于生物制藥、食品、行業; 以及電力、化工、電鍍、等行業的產業水處理中, 還被利用于半導體晶圓的生產中,隔膜閥是特別實用于運送有腐化性，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，隔膜閥的把持機構，是不***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。

diaphragm valve is a special form of cut-off valves, which open and close this is a piece of soft quality materials produced by the divide, it separate the inside body and inlet inside the cover. diaphragm valve is really only "jaw" valves, a flexible, three of diaphragm by Lo underground link in compressed pieces, the compression of which is operated by stem next movement when compressed pieces rise diaphragm on hold, resulting in access, when compressed pieces falling, diaphragm pressure on the weir in valve body (even for the weir-type valves) or pressure at the bottom contours (even for straight-through processing), diaphragm valve applicable to switches and reducing use.

diaphragm valve own special reasons for the structural design suitable for super pure medium or severe pollution very ropy liquids, gases, corrosive or inert medium. Combined with control equipment, diaphragm valve replace other more traditional control systems, especially vulnerable pollution applicable to solid inert medium. Biological products are mainly used in the pharmaceutical, food, industry; And the power, chemical, electroplating, and industrial water treatment industries, was also applied to the semiconductor wafer production, diaphragm valve particularly applicable to the delivery of a corrosive, became the fluid, such as mud, food, medicines, woven together liquid-dimensional, because pipelines, diaphragm valve operating agencies, it is not exposed to the delivery of fluid, So no polluting, and do not need to fill, the Department can not fill stem will leak.