The main feature of the flange connection fixed cast steel ball valve produced and sold by Huadian Pump Valve Company is its compact structure, reliable sealing, simple structure, convenient maintenance, sealing surface and spherical surface are often in a closed state, not easy to be eroded by the medium, easy to operate and maintain, suitable for water, solvent, acid and natural gas and other general working media, but also suitable for working conditions of harsh media, such as oxygen, hydrogen peroxide, methane and ethylene, etc., in various industries have been widely used. The ball valve body can be monolithic or combined.