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Flange ball valve apply to: Oil/nature gas/coal mine/ore mining, refining and pipeline transport systems; Chemical products, medicinal & pharmaceutical products and food producing; Hydropower/thermoelectricity and nuclear power production system; Drainage/heating/airing system in cities and industrial enterprises; Irrigation and drainage network; metallurgical production system; They are essential mechanical products that closely interrelated with production & construction, national defense construction and people’s lives. ball valves are widely use in pipe system for blocking or connecting various kinds of medium, thus enable the object to be transported to the assigned position.