The working principle:

Pneumatic butterfly valve is a kind of pneumatic valve which uses the circular butterfly plate rotating with the valve as the opening and closing property, so as to realize the opening action. The pneumatic valve is mainly use as block valve, and can also design to have the function of regulation or section valve and regulation. The butterfly valve is use more and more in the low-pressure and large and medium caliber pipeline.

Butterfly valve is simple in structure, small in volume and light in weight, and only consists of a few parts. Moreover, the valve can open and close quickly with only 90 ° rotation, and the operation is simple. At the same time, the electric valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the butterfly plate thickness is a single resistance when the medium flows through the valve body, so the pressure drop generated by the valve.

It is very small, so it has better flow control characteristics. Butterfly valve has two types of seal: elastic seal and metal seal. Elastic sealing valve, sealing ring can be inlaid on the valve body or attached to the periphery of butterfly plate.

If butterfly valve is require to be used as flow control, the main thing is to correctly select the size and type of valve. The structure and principle of butterfly valve is especially suitable for making large-diameter valve. Butterfly valve is not only widely used in petroleum, gas, chemical industry, water treatment and other general industries, but also in the cooling water system of thermal power station.


1. Small and light, easy to disassemble and repair, and can install at any position.
2. The structure is simple and compact, the operating torque is small, and the 90 ° rotary opening is fast.
3. The flow characteristics tend to be straight and the regulation performance is good.
4. The connection between the butterfly plate and the valve rod adopts a pin free structure, which overcomes the possible internal leakage point.
5. The outer circle of the butterfly plate adopts the spherical shape, which improves the sealing performance and prolongs the service life of the valve, and keeps zero leakage for more than 50000 times of opening and closing under pressure.
6. The seal can replace, and the sealing is reliable to achieve two-way sealing.
7. The butterfly plate can coate according to the user’s requirements, such as nylon or polytetrafluoroethylene.
8. The valve can design for flange connection and wafer connection.
9. The driving mode can be manual, electric or pneumatic.


pneumatic butterfly valve epdm