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FEP (F46), PCTFE (F3) fluorine lined butterfly valves are used in various concentrations-150 ?-50 ? aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid, and various organic acids, strong acids, strong oxidizers, FEP also applied various concentrations of alkali organic solvents, as well as other corrosive gases, liquids pipeline use.