Pneumatic butterfly valve is a small and light butterfly valve, which is composed of butterfly valve and pneumatic actuator. Its opening and closing are completed by the round butterfly valve rotating with the valve stem. At present, pneumatic butterfly valves are used to make large diameter in industrial systems. The valve is small in size, light in weight, simple in structure, low in cost, and labor-saving in opening and closing, so its usability is becoming more and more extensive.

In order to meet the application requirements of industrial applications such as high and low temperature, strong erosion and long life, metal sealed butterfly valves have been greatly developed in the past decade. With the application of high temperature, low temperature, strong corrosion, strong erosion and high-strength alloy materials in butterfly valves, metal sealed butterfly valves have been widely used in industrial fields such as high and low temperature, strong erosion and long service life. There are butterfly valves with large diameter (9750mm), high pressure (2.2kN/cm2) and wide temperature range (- 102~606 ℃), So that the technology of butterfly valve can reach a new level.