In a word, pneumatic butterfly valve is a kind of pneumatic valve commonly used at present. It has a high frequency of use in industries such as industrial, chemical and metallurgical industries. There are many types of pneumatic butterfly valves, and the most appropriate valve type can be selected according to actual needs.

Pneumatic regulating butterfly valve is a kind of valve (valve plate) rotating around a fixed axis perpendicular to the channel. It is composed of a piston type double acting or single acting (spring return type) pneumatic actuator and butterfly valve. According to the structure, it can be classified into medium linear structure, eccentric elastic seat sealing structure, and three-dimensional eccentric multi-level elastic sealing structure. It belongs to rotary high-performance regulating or shut-off valves. Equipped with electro pneumatic valve positioner or solenoid valve, air filter pressure reducer, limit switch (valve position indicator), it can realize proportional regulation and two position cut-off control of fluid medium in process pipeline, so as to achieve automatic control of flow, pressure, temperature, liquid level and other parameters of fluid medium. It is widely used in gas, turbid liquid, thick slurry, ash powder, suspended particles and other media.