Diaphragm valve is a special form of shut-off valve, appeared in the 20th century, 20 years. It is a piece of open and close with a soft material made of the diaphragm, the valve body cavity and the valve cover cavity and drive components separated, so called diaphragm valve.
Diaphragm valve features are as follows:
The most prominent feature is the diaphragm to the lower part of the valve body cavity and the upper valve cover cavity separated, so that the diaphragm above the stem, disc and other parts from the media corrosion, eliminating the filler seal structure, and will not produce media leakage The
The use of rubber or plastic and other soft seal made of the diaphragm, good sealing. As the diaphragm for the wearing parts, depending on the characteristics of the media and regular replacement.
By the diaphragm material restrictions, diaphragm valve for low pressure and temperature is relatively low occasions.
Diaphragm valve can be divided into structure: house type, DC type, cut-off type, straight type, gate type and right angle type six; connection form is usually flange connection; by driving method can be divided into manual, electric and pneumatic three , Of which pneumatic drive is divided into normally open, normally closed and reciprocating three.