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The butterfly valve is also called a flap valve. It is a simple regulating valve. It can also be used for the switch control of low-pressure pipeline media. The valve butterfly valve refers to the closing member (valve or disc) as a disc, surrounding the valve. A valve that rotates to open and close. The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal, and radioactive media. Mainly cut and throttle on the pipeline. The butterfly valve opening and closing member is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjusting. The function of the butterfly valve is to control the flow of the fluid, mainly cutting and throttling on the pipeline.

Butterfly valves are now the fastest growing, and are developing towards high temperature, high pressure, large diameter, high sealing, excellent regulation performance and long life. They have partially replaced gate valves, globe valves and ball valves. As a component used to realize the on-off and flow control of pipeline systems, butterfly valves have been widely used in many fields such as petroleum, chemical, metallurgy, and hydropower. In the known butterfly valve technology, the sealing form is mostly sealed, and the sealing material is rubber, polytetrafluoroethylene or the like. Due to structural limitations, it is not suitable for industries such as high temperature resistance, high pressure, corrosion resistance and wear resistance.

The advantages of the butterfly valve:

1. Simple structure, small size and light weight.

2. Under low pressure, a good seal can be achieved.

3, easy to open and close, labor-saving, small fluid resistance, can be operated frequently.

4, can transport mud, the accumulation of liquid at the mouth of the pipe is the least.

5, the adjustment performance is good.

The disadvantages of the butterfly valve:

1. Poor sealing.

2. The use pressure and working temperature range are small.

According to the structure, the butterfly valve can be divided into a central seal type, a single eccentric seal type, a double eccentric seal type and a triple eccentric test butterfly valve. The central seal type belongs to the earlier butterfly valve form; compared with the central seal type, the single eccentric sealing butterfly valve has a more complicated structure, a slightly higher cost, better sealing performance, longer service life and higher operating pressure; double eccentric sealing type and Compared with the single eccentric type, the three eccentric butterfly valves are more complicated in structure, high in manufacturing cost, better in sealing performance, longer in service life, and higher in use pressure.

The characteristics of the industrial special butterfly valve can withstand high temperature, the applicable pressure range is also high, the valve has a large nominal diameter, the valve body is made of carbon steel, and the sealing ring of the valve plate uses a metal ring instead of the rubber ring. Large high temperature butterfly valves are manufactured by steel plate welding and are mainly used for flue ducts and gas pipes of high temperature media.