The fluoroplastics is called "The King of the Plastics". It has been widely used in many fields because of its very high mechanical intensity, excellent corrosion resistance, thermoset and insulation, especial its resistance to the corrosion of all kinds of strong corrosive medium. The spherical butterfly valve with fluoroplastics lining can bear strong corrosive medium such as acid, alkali, salt, strong oxidant and organic solvent in any concentration. So it is applied as intercepe and start and stop valve when transporting strong corrosive medium in the field such as petroleum, chemical engineering, metallurgy, pharmacy, war industry and so on.
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