1) The working principle of the mechanical seal requires that the mechanical seal does not have any impurities inside. Before assembling the mechanical seal, thoroughly clean the moving ring, static ring, shaft sleeve and other components.

2) Check whether there are scratches, cracks and other defects on the surface of the dynamic and static ring, which will cause serious leakage of the mechanical seal. If there are conditions, you can use special tools to check whether the sealing surface is flat, the sealing surface is uneven, and the pressure water will enter the dynamic and static ring sealing surface of the mechanical seal after assembly, separating the dynamic and static ring, and the mechanical seal fails. If necessary, tooling can be made for hydrostatic test before assembly.

3) Check whether the dynamic and static ring seat has defects that affect the seal. For example, whether there is a defect on the mating surface of the dynamic and static ring seat and the dynamic and static ring sealing ring.

4) Check whether the mechanical seal compensation spring is damaged and deformed, and whether the stubbornness coefficient changes.

5) Check whether the sealing sleeve has defects such as burrs and grooves.

6) Clean and check all sealants for cracks, pores and other defects, and measure whether the diameter of the rubber ring is within the tolerance.

7) The mechanical seal with pumping mechanism should also check whether the spiral of the screw pump has cracks, broken wires and other defects.