The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline, and the butterfly plate is driven by the valve rod. In the cylindrical channel of the butterfly valve body, the disc shaped butterfly plate rotates around the axis with a rotation angle of 0 ° - 90 °. When it rotates to 90 °, the valve is fully open. The flow of medium can be controlled by changing the deflection angle of the butterfly plate.

Pneumatic butterfly valve has the advantages of simple structure, small flow resistance coefficient, straight flow characteristics, and can be used for cutting and regulating. The air consumption of pneumatic butterfly valve is proportional to the valve diameter and cylinder diameter. The larger the cylinder, the more air consumption, and the longer the switching time. The air consumption corresponding to the cylinder is listed below.