The composition and work characteristics of the diaphragm valve Regulate the diaphragm valve diaphragm instead of the spool component corrosion-resistant lining of the body and resistance to corrosion, the use of the diaphragm move. Diaphragm valve body materials made of cast iron, cast steel or cast stainless steel, and lined with a variety of corrosion or wear-resistant materials, diaphragm materials, rubber and PTFE. The lining membrane corrosion resistance, applies to the regulation of acid, alkali and other strong corrosive media. The diaphragm valve of simple structure, small fluid resistance, and flow capacity than other types of valves with the specifications; no leakage, can be used for high viscosity and suspended particles in the medium adjustment. Diaphragm to the media and the stem cavity isolation, so there is no packing medium does not leak. However, due to the limitations of the diaphragm and lining materials, pressure, temperature resistance and poor, generally apply only to 1.6MPa Nominal pressure and 150 ° C or less. The flow characteristics of the diaphragm close to the features quick, before 60% of stroke is approximately linear, 60% of the traffic changes. Aerodynamic form of the diaphragm valves can still be attached to the feedback signal, stopper and locator devices, to adapt to the needs of self-control, program control or regulate traffic. The pneumatic diaphragm valve feedback signal using non-contact sensor technology. This product uses the film propulsion cylinder, replace piston cylinder, ruled out the piston rings are easily damaged, resulting in leakage caused by the drawbacks that can not push the valves open and close. When the gas supply fails, they can still handwheel valves open and close.