With modern rapid development of petrochemical industry, in particular the use of some of the conditions is very corrosive media, even stainless steel valves and lining rubber, ceramic valves also can not meet the need. If the use of Hastelloy, Monel or Alloy 20, etc., as the valve material, because it contains a large number of Ni, Cr, Ti, Mo, Nb, and Pt and other precious metals, their resources limited and expensive. According to modern science and technology achievements in the molecular structure of fluorine fluorocarbon plastic keys and the shielding effect, with excellent corrosion resistance, high (low) temperature, non adhesion and electrical insulation, resistance to almost all chemicals (including hydrofluoric acid, sulfuric acid and aqua regia) of the corrosion. Fluorine plastic plastic processing principle, fluorine plastic lined steel shell in the general body in order to isolate the metal with strong corrosion of steel by direct contact, not only solve the fluoroplastic low strength and can not withstand high pressure, and solves the Steel corrosion problems intolerance. Fluoroplastic lined butterfly valves have excellent heat resistance and cold resistance, excellent electrical insulation and excellent chemical stability, resistance to various acid, alkali and strong oxidant corrosion, low friction and is very self-lubricating , and can be long – 195 ~ 200 ℃ range.

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