The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be opened and closed quickly by rotating
90°, and the operation is simple. At the same time, the valve has good fluid control characteristics. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation reaches 90°, the valve is fully opened. When the flange 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 generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be embedded in the valve body or attached to the periphery of the butterfly plate.
Butterfly valves are divided into U type flange butterfly valves and double flange butterfly valves.
Introduction of flange butterfly valve:
The center of rotation of the butterfly plate of the flange butterfly valve (ie the center of the valve stem) is located on the center line of the valve body and the sealing surface section of the butterfly plate. The valve seat is made of synthetic rubber. When closed, the outer circular sealing surface of the butterfly plate squeezes the synthetic rubber valve seat, which makes the valve seat elastically deformed and forms an elastic force as the sealing pressure to ensure the sealing of the butterfly valve. Well-known domestic manufacturers include Shanghai Quangong Valve Equipment Co., Ltd. and Hunan Xinxing Hydropower Equipment Co., Ltd. Its company is a designated management and production enterprise by the Ministry of Machinery Industry, the Ministry of Chemical Industry, and China National Chemical Equipment Corporation. Its products have certain price advantages and technical advantages in the industry.
The sealing structure of the flange butterfly valve adopts polytetrafluoroethylene and synthetic rubber to form a composite valve seat. Its characteristic is that the elasticity of the valve is still provided by synthetic rubber and uses the characteristics of low friction coefficient, not easy to wear, and not easy to aging, so that The life of the butterfly valve is improved.
The sealing principle and structural characteristics of flanged butterfly valves are the same as those of ordinary centerline butterfly valves.
The sealing structure of flange butterfly valve adopts polytetrafluoroethylene, synthetic rubber and phenolic resin to form a composite valve seat, which makes the valve seat more elastic and stronger. At the same time, the butterfly plate is fully covered with PTFE, so that the butterfly plate has strong corrosion resistance.
Its sealing principle and structural characteristics are the same as ordinary centerline butterfly valve.