- DN:
- 50-2000
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Currently, soft-sealing butterfly valves, as a component used to realize on-off and flow control of pipeline systems, have been used in petroleum, chemical industry, metallurgy, It is widely used in many fields such as hydropower. In the known butterfly valve technology, the sealing form mostly adopts a sealing structure, and the sealing materials are rubber, polytetrafluoroethylene, etc. Due to the limitations of structural characteristics, it is not suitable for industries such as high temperature resistance, high pressure resistance, corrosion resistance, and wear resistance. An existing relatively advanced butterfly valve is a triple-eccentric metal hard-seal butterfly valve. The valve body and valve seat are one-piece components, and the sealing surface layer of the valve seat is overlay-welded with temperature-resistant and corrosion-resistant alloy materials. Multi-layer soft stacked sealing rings are fixed on the valve plate. Compared with traditional butterfly valves, this kind of butterfly valve has high temperature resistance, is easy to operate, and has no friction when opening and closing. When closing, the torque of the transmission mechanism increases to compensate for the seal, which improves the performance of the butterfly valve. Excellent sealing performance and extended service life.