Abstract: Star-shaped discharge valves are common equipment for powder conveying. Axial leakage tends to occur on both ends of the star-shaped discharge valve in the conveying process of high hardness powder. By analyzing the main reasons for the axial leakage fault of the star-shaped discharge valve, the improvement measures for rotor structure are proposed. The application results after the improvement show that wear resistance of the sealing surface can be improved by increasing the sealing surface hardness of the rotor shaft at both ends of the star-shaped discharge valve; wear on sealing surface can be reduced evidently and the service life of the equipment can be extended. Meanwhile, the rotor impeller is changed to a split structure, which is advantageous to rotor machining and equipment overhaul.

Key words: star-shaped discharge valve, axial leakage, rotor axis, structure optimization