The main principle and brief characteristics of butterfly valve

- Apr 08, 2018 -

The butterfly valve is also called a turn over valve. It is a simple regulating valve and can also be used for the switch control of the medium of the low pressure pipe. The valve is a valve that is turned on and closed around the valve shaft. The valve can be used to control air, water, steam and various corrosiveness. Medium, mud, oil, liquid metal and radioactive medium are all kinds of fluids. The main function of the pipe is cut off and throttling. The butterfly valve opening and closing part is a disc shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or regulating.

Working principle:

Shanghai crown ring valve manufacturing Co., Ltd. produced butterfly plate driven by the stem, if it turns 90 degrees, it can complete a start and shut. Changing the deflection angle of the butterfly plate can control the flow rate of the medium.

Operating conditions and medium: butterfly valves are suitable for the pipeline of various corrosive and non corrosive fluid medium in engineering systems such as furnace, gas, natural gas, liquefied petroleum gas, city gas, cold and hot air, chemical smelting and power generation environmental protection, and building water supply and drainage systems.


1, opening and closing is convenient, fast and labor-saving, and the fluid resistance is small, so it can be operated regularly.

2, simple structure, small size, short structure, small volume and light weight. It is suitable for large caliber valves.

3, mud can be transported and liquid stored at the outlet is the least.

4, low pressure, can achieve good seal.

5. The regulation performance is good.

6, the full opening valve seat has larger effective flow area and smaller fluid resistance.

7, the opening and closing moment is smaller. Because the butterfly plates on both sides of the rotating shaft are basically equal in the medium action, and the torque direction is opposite. Therefore, the opening and closing is more labor saving.

8, the sealing surface materials generally use rubber and plastic, so the low pressure sealing performance is good.

9. The installation is convenient.

10, operation is flexible and labor-saving. Manual, electric, pneumatic and hydraulic methods can be selected.


The butterfly valve is simple in structure, small in size, light in weight and less in its components. The key parts can be made up of butterfly valve. It is also very convenient to open the valve. Only the switch is selected to ninety degrees. The control of the butterfly valve to the fluid is very good. It can increase the flow or reduce the flow at any time, and the valve is transported. When you lose any fluid, there is a certain resistance, and the resistance of the butterfly valve is mainly from its own, such as the thickness of the butterfly valve body. If you want to reduce the resistance to the fluid, it is only necessary to reduce the thickness of the valve.

The elastic seal has a temperature limitation.

Butterfly valve is also a wide range of use, if used to control the flow of flow, you need to choose different types and the size of the valve body, because the butterfly valve in the design itself is more suitable for a number of larger caliber valves. Butterfly valves are widely applied not only in petroleum, gas, chemical industry, water treatment and other general industries, but also in the cooling water system of thermal power stations.

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