The 77/78-31300 series pneumatic high-performance butterfly valve is a new generation of pneumatic hard seal butterfly valve designed and developed independently based on the double eccentric sealing butterfly valve and drawing on advanced foreign technology. The valve core adopts the latest three eccentric structure, which matches the sealing surface at the moment of closing, basically eliminating the friction between the butterfly plate and the valve seat during valve opening and closing. Therefore, it has better performance, more reliable sealing, and longer service life. Pneumatic high-performance butterfly valves can be widely used in automation control systems in industries such as petroleum, chemical, power plants, metallurgy, and light industry.