Flanged ball valve mainly used to cut off or adjust the direction of the medium in pipeline, valve structure is easy operation and maintenance, horizontal and vertical pipelines both can be installed, convenient for pneumatic control and electrical control. Pioneer flanged ball valve applicable to water, solvents, acid-bases, natural gas, oxygen, hydrogen peroxide, methane and ethylene and other special condition, usually use in daily chemical, fine chemical, biochemical & biotechnology, pharmaceutical, shipbuilding, papermaking, printing and dyeing, coating, environmental protection, refrigeration, oils & fats, brewing, food & beverage, water treatment and urban construction and other fields.