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Brief introduction and characteristic analysis of butterfly valve

Source: Date:2021.12.31

Overview of butterfly valve standard: the product structure of the new high-performance butterfly valve is designed as floating seat. According to the direction of the pressure source, the valve seat position is automatically adjusted to maintain the pressure on both sides of the valve. This also extends the service life of the valve seat. Long service life of butterfly valve. The dust-proof design prevents fluid from entering the valve shaft and causing the valve shaft to get stuck. According to different working conditions, different materials and properties can be selected for high-performance butterfly valves. The valve seat is made of PTFE, rtfe, peek, metal and other materials. It is suitable for petrochemical, oil refining, air separation, CDA and other working conditions.

Main features of butterfly valve: it is especially suitable for making large-diameter butterfly valve, and the butterfly plate is installed in the direction of pipeline diameter. In the cylindrical channel of the butterfly valve body, the disc butterfly plate rotates around the axis with a rotation angle between 0 ° and 90 °. When the rotation reaches 90 °, the valve is fully open. The utility model has the advantages of simple structure, low cost and large adjustable range. The sealing of butterfly valve is based on rubber, which is far from the metal hard sealing performance of hemispherical valve, ball valve and gate valve. After long-term use of the hemispherical valve, the valve seat will also produce a small amount of wear. You can continue to use it through adjustment. During opening and closing, the valve stem and packing only need to rotate 90 °. When there are signs of leakage, press the packing gland. Several bolts can ensure that there is no leakage of packing, but other valves are still rarely used to deal with small leakage and replace large leakage. The existing relatively advanced butterfly valve is a three eccentric metal hard seal butterfly valve. The valve body and valve seat are connecting parts. The sealing surface layer of the valve seat is welded with high-temperature and corrosion-resistant alloy materials. The multi-layer soft laminated sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, the butterfly valve has higher temperature resistance, is easy to operate, and has no friction when opening and closing. When closed, the torque of the transmission mechanism increases to compensate for the seal, thereby improving the butterfly valve. Good sealing performance and long service life.

Butterfly valve structure application: the butterfly valve has the advantages of fast opening and closing speed, simple structure and low cost, but its sealing performance and pressure bearing capacity are poor. At present, as a component used to realize the switching and flow control of pipeline system, butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. Most of its sealing forms adopt sealing structure, and the sealing materials are rubber, polytetrafluoroethylene, etc. Due to the limitation of structural characteristics, it is not suitable for industries such as high temperature resistance, high pressure resistance, corrosion resistance and wear resistance.

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