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Fluorine - lined butterfly valve, rubber - lined butterfly valve, as a component used to realize pipeline system switching and flow control, has been widely used in many fields such as petroleum, chemical, metallurgy, water and electricity.In the known butterfly valve technology, the sealing form of the seal structure, sealing materials for rubber, ptfe, etc.Due to the limitation of structural characteristics, not suitable for high temperature, high pressure and corrosion resistance, abrasion resistance and other industries.A kind of advanced butterfly valve is a hard seal butterfly valve with triple eccentricity. The valve body and seat are connected members. The surface layer of seat seal is surfacing welded with heat-resistant and corrosion-resistant alloy material.Multi-layer soft folding sealing ring is fixed on the valve plate. Compared with traditional butterfly valve, this butterfly valve has the advantages of high temperature resistance, light operation, no friction in opening and closing. When closing, the torque of transmission mechanism increases to compensate the seal, which improves the sealing performance of butterfly valve and prolongs the service life.Valves of this type shall generally be installed horizontally in the pipeline.

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