Pneumatic butterfly valves are commonly used in industrial processes to control the flow of various fluids, such as gases and liquids. They belong to the family of quarter-turn valves and operate by rotating a disc or plate (resembling a butterfly) within the flow path to regulate the fluid flow. Here are the basic principles and structural characteristics of pneumatic butterfly valves:

To ensure a tight shut-off when the valve is closed, a sealing mechanism is implemented between the disc and the valve body. This prevents leakage when the valve is in the closed position and contributes to the overall efficiency of the valve.