1. Repair of the working surface: If the wear on the pump cover's working surface is minor, it can be removed by hand grinding. Place a small amount of valve abrasive on a platform or thick glass plate, then place the pump cover on it and grind until the wear marks are removed and the working surface is smooth. If the wear depth on the pump cover's working surface exceeds 0.1 mm, it must be repaired by first machining and then grinding.
2. Repair of the drive shaft bushing bore: The repair method for worn drive shaft bushing bores on the pump cover is the same as that for worn drive shaft bushing bores on the housing.
Repair of the pump housing inner cavity: After wear on the pump housing inner cavity, it is repaired using the inner cavity insert method. This involves enlarging the inner cavity and inserting a cast iron or steel bushing. After inserting the bushing, the inner cavity is rimmed to the required dimensions, and the protruding end face of the bushing is ground away, ensuring it is flush with the pump housing mating surface.
3. Repair of the valve seat: Pressure relief valves come in two types: ball valves and plunger valves. When a ball valve seat is worn, place a steel ball on the seat and gently tap the ball with a metal rod until the ball valve and seat fit together tightly. If the seat is severely worn, ream to remove the wear marks and then use the same method to achieve a tight fit. When a plunger valve seat is worn, add a small amount of valve grinding compound and grind until a tight fit is achieved.
