Introduction to the method of
mechanical seal replacement
2021-07-17 11:12
How to replace the pump mechanical seal:
1. Install the left part first; install it on the sealing plate.
2. Then install the moving ring on the right. The sealing surfaces of the moving ring and the static ring should be clean.
3. Reinstall the flat key and impeller. Install the gasket and nut. Before installation, it is necessary to carefully check whether the number of assembly and sealing parts is sufficient, and whether each component is damaged, especially whether the dynamic and static rings have defects such as bruises, cracks, and deformation. If there is a problem, it needs to be repaired or replaced with new spare parts.
4 Check whether the chamfer of the shaft sleeve or gland is correct, and if it does not meet the requirements, it must be trimmed.
5 The components of the mechanical seal and their related assembly contact surfaces must be cleaned with acetone or absolute alcohol before installation. The installation process should be kept clean, especially the dynamic and static rings and auxiliary sealing components should be free of impurities and dust. Apply a layer of clean engine oil or turbine oil to the surfaces of the dynamic and stationary rings.
6 The gland should be tightened after the coupling is aligned. The bolts should be tightened evenly to prevent the gland section from deflecting. Use a feeler gauge or a special tool to check each point, and the deviation should not be greater than 0.05 mm.
7 Check the fit clearance (and concentricity) between the gland and the outer diameter of the shaft or bushing, make sure that the surroundings are even, and use a feeler gauge to check that the tolerance of each point is not greater than 0.10 mm.
