Pneumatic butterfly valve is composed of pneumatic actuator and butterfly valve. The pneumatic butterfly valve uses a round butterfly plate rolling with the valve to open and close, so as to complete the opening action. The pneumatic valve is mainly used as a block valve. It can also be planned to have the function of conditioning or section valve and conditioning. At present, butterfly valves are increasingly used in low-pressure large and medium-sized pipelines.

The commonly used butterfly valves are wafer type butterfly valve and flange type butterfly valve. Wafer type butterfly valve uses stud bolts to connect the valve between two pipe flanges. Flange type butterfly valve has flanges on the valve, and bolts are used to connect the flanges on both ends of the valve to the pipe flanges.