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English name: butterfly valve

Butterfly valve is a valve that uses a circular butterfly plate as an opening and closing part and rotates with the valve stem to open, close and adjust the fluid channel. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is fully open.

Butterfly valves are suitable for regulating and cutting off pipelines transporting various corrosive and non-corrosive fluid media in engineering systems such as generators, coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting, power generation and environmental protection. The flow of media. 

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The valves are not maintained in a timely manner, resulting in disrepair, leakage or malfunctioning switches; the valves are not regularly inspected and tested for pressure, or even used for many years without cleaning, pressure testing and technical appraisal, resulting in debris deposited in the valve, lax closure, and serious leakage. Oil, oil leakage; the valve is not closed after maintenance, or the pipe opening is not blocked after the valve is removed.

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In fluid pipeline systems, valves are control components whose main functions are to isolate equipment and pipeline systems, regulate flow, prevent backflow, regulate and relieve pressure. Since it is very important to select the most suitable valve for the pipeline system, it is also important to understand the characteristics of the valve and the steps and basis for selecting the valve.

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For a single core, when the medium is flow-open, the valve has good stability; when the medium is flow-closed, the valve has poor stability. The double-seat valve has two valve cores. The lower valve core is closed and the upper valve core is open. In this way, when working at a small opening, the closed-flow valve core will easily cause vibration of the valve. This is a double-seat valve. The reason why it cannot be used for small opening work.

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