The structure principle of pneumatic butterfly valves:

Pneumatic valve is compose of pneumatic actuator and valve body two parts. The pneumatic actuator also have three accessories:
1. Solenoid valve (mainly used for switching air source),
2. Limit switch (remote to know whether the valve is open or closed),
3. The air filter regulator (filtered air moisture inside, because air is not a pure gas, air compressor air is usually call will have water, so the use of air filter regulator, won’t have a lot of water in the cylinder.)

The working principle of pneumatic butterfly valve:

1, Butterfly valve is a round disc rotating with the valve stem, with open and close, so that the effective action of the air valve is mainly use as a globe valve. Alternatively, it can design with regulating or sectional valves and regulating functions. The use of disc valve in low – pressure medium – diameter pipe is increasing.

2. Butterfly valve is compose of simple structure, small size, light weight and few parts. In addition, only need to rotate 90, can be quickly open and close, simple operation, and the electric valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the single resistance when the medium flows in the spool, so it is the pressure generate by the valve.

3, Because it is small, so the flow control characteristics are good. There are two sealing types: butterfly valve spring seal and metal seal. Elastic seal valve, seal ring can be embedded in the body, can also be installed around the disc.

If butterfly valve is require to be used as flow control. It is mainly the correct choice of valve size and type. The structure principle of pneumatic butterfly valve is especially suitable for the production of large diameter valves. It is not only widely used in petroleum, natural gas, chemical industry, water treatment and other general industries, but also used in the cooling water system of thermal power plants.