Pneumatic butterfly valve is composed of pneumatic actuator and butterfly valve. The pneumatic butterfly valve uses a circular butterfly plate that rotates with the valve stem for opening and closing. The pneumatic valve that realizes the activation action is mainly used as a cut-off valve. It can also be designed to have the function of adjustment or segment valve and adjustment. At present, the butterfly valve is at low pressure and large The use of medium-diameter pipelines is increasing. The main advantages of pneumatic butterfly valves are simple structure, small size, light weight, and low cost. The characteristics of pneumatic butterfly valves are particularly significant. They are installed in high-altitude dark channels. The pneumatic butterfly valve passes through two-position three-way (or two-position three-way). Position five-way) solenoid valve is easy to control and operate, and it can also adjust the flow medium.