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Pneumatic butterfly valve is a kind of automated butterfly valve driven by pneumatic actuator, which is widely used in petroleum, chemical industry, electric power, metallurgy, water supply and drainage and pharmaceuticals and many other industrial working conditions. The valve is suitable for water, steam, air, oil and a variety of corrosive media, with excellent sealing performance and corrosion resistance. Pneumatic butterfly valve realizes quick opening and closing through pneumatic actuator, sensitive response, easy operation, supports remote automatic control, and meets the demand of modern industrial automation. Compact structure, light weight, small flow resistance, rapid and stable opening and closing, good pressure resistance and wear resistance. Its advantages are high degree of automation, precise control, easy maintenance, long service life, suitable for frequent operation and complex working conditions. Pneumatic butterfly valve not only realizes the efficient cutting off and flow adjustment of medium, but also improves the safety and reliability of system operation, which is an indispensable and important valve equipment in modern industrial process control system.