If mechanical seal parts fail, it is necessary to replace the parts or improve the machining accuracy of the parts. Improving the machining accuracy of the mechanical seal itself and the machining accuracy of other parts of the pump body is very beneficial to the effect of the mechanical seal.

In order to improve the sealing effect, the smoothness and unevenness of the friction surface of the static and dynamic rings are required to be higher. The width of the friction surface of the static and dynamic rings is not large, generally between 2 and 7 mm.

The principle of mechanical seal leakage

The leakage of the mechanical seal is caused by a variety of reasons, and we need to deal with specific problems. In order to minimize the amount of leakage, the mechanical seal must be assembled in strict accordance with the technical requirements when installing the mechanical seal, and the following matters must also be noted.

1) The assembly should be clean and smooth. The parts, tools, lubricating oil, and wiping materials of the mechanical seal must be very clean. The sealing end faces of the moving and static rings should be wiped with soft gauze.

2) Trimming chamfer rounding. The chamfers of the shaft and the sealing end cover should be trimmed and smooth, and the rounded corners of the shaft and the end cover should be sanded and polished.

3) When assembling the auxiliary sealing ring, the rubber auxiliary sealing ring cannot be soaked and washed with gasoline or kerosene to avoid swelling, deformation and premature aging. After the dynamic and static rings are assembled, press the compensation ring by hand to check whether it is in place and flexible; whether the elastic split ring is reliably positioned. After the moving ring is installed, it must be ensured that it moves flexibly in the axial direction on the shaft.

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