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Description of the function of the diaphragm valve

Diaphragm valves are a special form of shut-off valve that appeared in the 1920s. Its opening and closing member is a diaphragm made of soft material, which separates the valve body cavity from the bonnet inner cavity and the driving component, so it is called a diaphragm valve.
The characteristics of the diaphragm valve are as follows:
The most prominent feature is that the diaphragm separates the lower valve body cavity from the inner cavity of the upper valve cover, so that the valve stem, valve disc and other parts located above the diaphragm are not corroded by the medium, the packing sealing structure is omitted, and no leakage of the medium occurs. .
A separator made of a soft seal such as rubber or plastic has a good sealing property. Since the diaphragm is a consumable part, it should be replaced periodically depending on the characteristics of the medium. Limited by diaphragm material, diaphragm valves are suitable for low pressure and relatively low temperature applications.
Diaphragm valves can be divided into six types according to the structure: house type, direct current type, cut-off type, straight-through type, gate type and right angle type; the connection form is usually flange connection; according to the driving method, it can be divided into manual, electric and pneumatic. Among them, the pneumatic drive is divided into three types: normally open, normally closed and reciprocating.

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