Diaphragm valve sealing principle:
The sealing principle of the diaphragm valve depends on the downward movement of the operating mechanism to press the diaphragm or diaphragm assembly and the weir lining valve body or straight lining valve body channel close, so as to achieve the seal. The sealing pressure depends on the downward pressure of the closing parts to achieve. Because the valve body can be lined with a variety of soft materials, such as rubber or PTFE. The diaphragm is also made of soft materials, such as rubber or synthetic rubber lining of teflon, so with a small sealing force can be achieved.
The diaphragm valve has only three main components: body, diaphragm and cover assembly. Diaphragm the lower valve body cavity and the upper valve cover cavity separated, so that located above the diaphragm stem, stem nut, valve disc, pneumatic control mechanism, electric control mechanism and other parts do not contact with the medium. And will not produce medium leakage, eliminating the packing box sealing structure.
Diaphragm valve features:
(1) Low fluid resistance.
(2) Can be used in the medium containing hard suspended matter. Because the medium is only in contact with the valve body and diaphragm. There is no need for packing box, no packing box leakage problem, no corrosion on the stem part.
(3) Suitable for corrosive, viscous, grout medium.
(4) Can not be used for high pressure occasions.