The pneumatic diaphragm valve is a special form of shut-off valve that appeared in the 20s of the 20th century. Its opening and closing parts are a diaphragm made of soft material, which separates the valve body cavity from the inner cavity of the valve cover and the driving components, so it is called pneumatic diaphragm valve. The most prominent feature of pneumatic diaphragm valve is that the diaphragm separates the lower valve chamber from the upper bonnet cavity, so that the valve stem, disc and other parts located above the diaphragm are not corroded by the medium, eliminating the packing sealing structure, and will not produce medium leakage.
