Diaphragm valve with corrosion-resistant lining of the valve body and corrosion-resistant diaphragm instead of the spool components, the use of the movement of the diaphragm from the regulatory role. Diaphragm valve body material is cast iron, cast steel, or cast stainless steel, and lined with a variety of corrosion-resistant or wear-resistant materials, diaphragm rubber and PTFE. Lining diaphragm corrosion resistance, for strong acid, alkali and other strong corrosive media regulation.

Diaphragm valve structure is simple, the fluid resistance is small, the circulation capacity of the same type of valve with other specifications; no leakage, can be used for high viscosity and suspension of particulate media regulation. Diaphragm to the media and the stem stem isolation, so there is no packing medium will not leak. However, due to the limitations of the diaphragm and lining materials, pressure resistance, poor temperature resistance, generally only applicable to 1.6MPa nominal pressure and 150 ℃ below.

Diaphragm valve flow characteristics close to the fast opening characteristics, in the 60% before the trip is almost linear, 60% after the flow of little change. Pneumatic diaphragm valve can be attached to the feedback signal, limiter and positioner and other devices to adapt to self-control, program control or adjust the flow of the need. Pneumatic diaphragm valve feedback signal using non-contact sensing technology. The product uses a thin film propulsion cylinder, replace the piston cylinder, ruled out the piston ring easy to damage, resulting in leakage and can not promote the valve opening and closing the drawbacks. When the gas source fails, can still operate the hand wheel to open and close the valve.