Butterfly valve structure working principle applicable environment analysis

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 disc rotates around the axis, the rotation Angle is between 0° and 90°, and the valve is fully open when it is rotated to 90°.

The butterfly valve is simple in structure, small in size, light in weight, and consists of only a few parts. And only need to rotate 90° can be quickly opened and closed, simple operation, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the resistance of the medium flowing through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. Butterfly valves have two types of seal: bullet seal and metal seal. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc.

The valve with metal seal generally has a longer life than the valve with elastic seal, but it is difficult to achieve complete seal. Metal seals can adapt to higher operating temperatures, while elastic seals have temperature-limited defects. If the butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of valve. The structure principle of butterfly valve is especially suitable for the production of large diameter valves. Butterfly valve is not only widely used in petroleum, gas, chemical industry, water treatment and other general industry, but also used in the cooling water system of thermal power station.

Commonly used butterfly valves are clamping butterfly valves and flanged butterfly valves. Clamping butterfly valve is connected between two pipe flanges with a double-headed bolt, flanged butterfly valve is a valve with a flange, and the two ends of the valve are connected to the pipe flange with bolts.