The butterfly plate of the butterfly valve is installed in the diametrical direction of the pipe. In the butterfly valve body cylindrical channel, disc-shaped butterfly plate around the axis of rotation, the rotation angle of 0 ° -90 ° between the rotation to 90 °, the valve is fully open state.

Butterfly valve structure is simple, small size, light weight, only a few parts from the composition. And only need to rotate 90 ° can quickly open and close, simple operation, while the valve has a 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 caused by the valve is very small, so it has better flow control characteristics. Butterfly valve with a sealed seal and metal seal two sealed type. Elastic seal valves, seals can be embedded in the valve body or attached to the butterfly plate around.

The use of metal sealed valves generally have a longer life than elastically sealed valves, but it is difficult to achieve complete sealing. Metal seals can be adapted to higher operating temperatures, and elastomeric seals have a temperature-limited defect.

If the butterfly valve is required to be used as a flow control, the main thing is to properly select the size and type of the valve. Butterfly valve structure is particularly suitable for the production of large diameter valves. Butterfly valve not only in the oil, gas, chemicals, water treatment and other general industry is widely used, but also used in thermal power plant cooling water system.

Commonly used butterfly valve has a pair of butterfly valve and flange butterfly valve two. The clip-on butterfly valve is a double-headed bolt to connect the valve between the two pipe flanges. The flange type butterfly valve is a flange with a flange connecting the two ends of the valve to the pipe flange with bolts.

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