With such features as small fluid resistance, smooth flow channel, rapid opening and closing, and easy automatic control, the ball valve has been widely used. But the seat of regular ball valves is generally made of PTFE and other nonmetal materials. Therefore, the metal seated ball valves have been widely applied in petroleum, chemical industry, electric power, metallurgy, light industry and etc. The metal seated ball valve is used to cut off or connect the media in various pipelines. It is suitable for severe service conditions containing solid granules, slurry, coal power, cinder and etc.

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