Butterfly valves have a simple structure, small size, and light weight, consisting of only a few components. And it can be quickly opened and closed by simply rotating 90 °, with simple operation, and the valve has good fluid control characteristics. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis at an angle between 0 ° and 90 °. When it rotates to 90 °, the valve is fully open. When the flange butterfly valve is in the fully open position, the thickness of the butterfly plate is the resistance of the medium flowing through the valve body, so the pressure drop generated by this valve is very small, thus it has good flow control characteristics. Butterfly valves have two sealing types: elastic sealing and metal sealing. Elastic sealing valve, the sealing ring can be embedded on the valve body or attached around the butterfly plate.

The main features of flange butterfly valve are:

1. Compact and lightweight, easy to disassemble and repair, and can be installed in any position.

2. The structure is simple and compact, with low operating torque and quick opening of 90 ° rotation.

3. The flow characteristics tend towards a straight line, with good regulation performance.

4. The connection between the butterfly plate and the valve stem adopts a pin free structure, which overcomes the possible internal leakage points.

5. The outer circle of the butterfly plate adopts a spherical shape, which improves the sealing performance and extends the service life of the valve. It can be opened and closed under pressure for more than 50000 times and still maintain zero leakage.

6. The sealing components are replaceable and the sealing is reliable, achieving bidirectional sealing.

7. Butterfly plates can be coated with coatings such as nylon or polytetrafluoroethylene according to user requirements.

8. This valve can be designed for flange connection and clamp connection.

9. The driving mode can be selected as manual, electric or pneumatic.

Flange butterfly valves are suitable for industries such as water supply and drainage, sewage, food, heating, gas, ships, hydropower, metallurgy, energy systems, and textiles, with temperatures ≤ 120 ℃ or ≤ 150 ℃ and nominal pressures ≤ 1.6MPa. They are particularly suitable for bi-directional sealing and valve body corrosion prone applications, as a medium for regulating flow and intercepting flow.