The Pneumatic Actuator Butterfly Valves is used as the round butterfly plate rotating with the valve to make the opening and closing. In order to realize the operation of the pneumatic valve, the valve is mainly used for the truncation valve, and it can also be designed to have the function of adjusting or adjusting the valve. At present, the use of the disc valve is more and more in the low pressure and large medium caliber pipeline. The butterfly plate of butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc shaped butterfly plate rotates around the axis, and the rotation angle is 0 degrees ~90 degrees. When the rotation is 90 degrees, the valve is fully opened.