Chinese Association of Idaho State University (CAISU)
Butterfly valve working principle and application environment analysis
Butterfly valve disc installed in the diameter of the pipe direction. Cylindrical channels in axial check valve body, disc disc around the axis of rotation, rotation Angle for 0 ° ~ 90 °, rotation to 90 °, the valve is fully open.
Butterfly valve simple structure, small size, light weight, only a few components. And only need to rotate 90 ° can rapid opening and closing, simple operation, at the same time, the valve has good flow 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, so the pressure drop through the valve is very small, so it has better flow control characteristics. Butterfly valve has a bullet seal and metal seal two sealing types. Elastomeric sealing valves, the sealing ring can be embedded in the body or attached to the disc around.
Metal sealed valves generally have a longer life than elastomeric valves, but it is difficult to achieve a complete seal. The metal seal can adapt to higher working temperature, and the elastic seal has the limitation of temperature.
When butterfly valves are required for flow control, it is important to select the correct size and type of valve. Butterfly valve structure is particularly suitable for the manufacture of large diameter valves. Butterfly valve is not only widely used in petroleum, gas, chemical industry, water treatment and other general industries, but also used in thermal power plant cooling water system.
Commonly used butterfly valve with clamp butterfly valve and flange butterfly valve two. Clamp butterfly valve is to use studs to connect the valve between the two pipe flanges, flange butterfly valve is the valve with a flange, bolt the two ends of the valve flange connected to the pipe flange.
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