Butterfly valve disc installed in pipe diameter direction.Cylindrical channels in butterfly valve body, disc disc around the axis of rotation, rotation Angle for 0 ° ~ 90 °, rotate to 90 °, the valve is fully open.
Butterfly valves are simple in structure, small in size and light in weight.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 butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics.Butterfly valve has the ball seal and metal seal two types of seal.Elastomeric sealing valve, sealing ring can be embedded in the body or attached to the disc around.
Valves with metal seals generally have a longer life than those with elastic seals, but are difficult to achieve complete sealing.Metal seal can adapt to higher working temperature, and elastic seal has the defect of temperature limit.
If butterfly valves are required to be used as flow control, the main thing is to choose the correct size and type of valve.Butterfly valve structure principle is particularly suitable for making large diameter valve.Butterfly valves are widely used not only in petroleum, gas, chemical, water treatment and other general industries, but also in cooling water system of thermal power station.
The commonly used butterfly valve has the clamp butterfly valve and the flanged butterfly valve two kinds.The wafer butterfly valve is connected with a double head bolt to connect the valve between two pipe flanges. The flanged butterfly valve is a valve with flanges, and the two ends of the valve are connected with the pipe flanges by bolts.