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Flange Fluorine-butterfly valve with the spherical sealing surface lining fluoride plastic bag lined butterfly plate, with the seat base of silicone rubber gasket to adjust the valve sealing performance; The valve operation, tight sealing performance, long service life; Can be quickly cut off or adjust flow. Suitable for reliable sealing and good regulation characteristics required. Body adopts the split type, valve shaft end sealing now by the rotation of the between disc and seat base and fluorine rubber to control, so as to achieve the product structure is compact, good appearance, reasonable process, reliable in performance. Ensure the valve spindle is not in contact with the cavity fluid, replacing valve spindle is very convenient and valves do not need to dismantle LiLi piping. Products are widely applied in various types of industrial liquid and gas in the pipeline transportation (including steam), especially have punished severely corrosive medium using occasions such as sulfuric acid, hydrofluoric acid, phosphate, acid, chlorine, alkali, aqua regia has a strong corrosive medium, etc.