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Butterfly valve (also called flap valve) is a kind of regulating valve whose closing part is circular disc or disc, mainly composed of valve body, valve stem, disc and sealing ring. 

The valve body is cylindrical, has a short axial length, and has a built-in butterfly plate. 

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, and the rotation angle is between 0° and 90°. When the rotation reaches 90°, the valve is fully opened.

The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be opened and closed quickly by rotating 90°, and the operation is simple. At the same time, the valve has good fluid control characteristics. 

When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body.

Therefore, the pressure drop generated by the valve is very small, so it has better flow control characteristics. The butterfly didlink valve has two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be embedded on the valve body or attached to the periphery of the butterfly plate.

Butterfly valves with metal seals generally have a longer life than those with elastic seals, but it is difficult to achieve a complete seal. The metal sealing butterfly valve can adapt to higher working temperature, while the elastic sealing butterfly valve has the defect of being limited by temperature.

If the butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of the valve. 

The structure principle of the butterfly valve is especially suitable for making large diameter didlink valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems in thermal power stations. Commonly used butterfly valves include wafer butterfly valves and flange butterfly valves. Wafer type butterfly valve uses double-head bolts to connect the valve between two pipe flanges. Flange type butterfly didlink valve has flanges on the valve, and the two ends of the valve are flanged to the pipe flanges with bolts.