Mechanical seals have the advantages of reliable sealing performance, small leakage, long service life, low power loss and wide application range. They are widely used in various technical fields, especially in the working conditions of high speed, high pressure difference and expensive or toxic and highly corrosive process media. At the same time, mechanical seal is one of the weakest links of the equipment.

　　In order to prolong its service life, in addition to selecting appropriate friction pair materials and appropriate end face specific pressure, correct installation and maintenance can also play an important role.