Sealing ring assembly tool and using method thereof

The sealing ring assembly tool comprises a pressing ring and a positioning shaft, the section of the pressing ring is in an inverted U shape, the section of the positioning shaft is in an inverted T shape, the face I of the positioning shaft is in positioning fit with the inner hole face of a valve seat, the diameter of the outer circle of the face II of the positioning shaft is smaller than the diameter of an inner hole of a sealing ring, and the face III of the positioning shaft is in guiding fit with the inner hole face of the pressing ring. Hoisting holes are formed in the tops of the pressing ring and the positioning shaft. The tool has the beneficial effects that the tool is simple in structure, low in manufacturing cost and high in practicability, the sealing ring cannot shake or incline or even be forcibly pressed in in the assembling process, the risk that the sealing ring is damaged in the assembling process is reduced, the sealing performance of the valve is more reliable, and the assembling effici