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Pneumatic butterfly valve is a type of valve composed of a pneumatic actuator and a butterfly valve. It achieves the opening and closing action through a circular butterfly plate that rotates with the valve stem. It is mainly used for block valves and can also be designed to have the function of adjusting or breaking the valve and adjusting. This type of valve is becoming increasingly common in low-pressure large and medium diameter pipelines. The classification of pneumatic butterfly valves includes stainless steel pneumatic butterfly valves, hard sealed pneumatic butterfly valves, soft sealed pneumatic butterfly valves, and carbon steel pneumatic butterfly valves. Its main advantages include simple structure, small size, light weight, and low cost, which are particularly significant, making the pneumatic butterfly valve easy to operate when installed in high-altitude tunnels.