The static ring separates from the static ring seat

As long as chemical valves manufacturer observe carefully and are familiar with the structure, you will be able to make a correct judgment. 2. Leakage during trial operation. After the mechanical seal for the pump undergoes static testing, the centrifugal force generated by the high-speed rotation during operation will inhibit the leakage of the medium.

Therefore, the mechanical seal leakage during trial operation is basically caused by the damage of the dynamic and static ring friction pairs after the failure of the shaft and the end cover seal is eliminated. The main factors that cause the failure of the friction pair seal are: (l) During operation, due to abnormal phenomena such as evacuation, cavitation, pressure holding, etc., a large axial force is caused to separate the contact surfaces of the dynamic and static rings; (2)

The installation When the mechanical seal is too large, the end face of the friction pair will be severely worn and scratched; (3) The moving ring sealing ring is too tight, and the spring cannot adjust the axial floating amount of the moving ring; (4) The static ring sealing ring is too loose, when When the moving ring floats axially,

the static ring separates from the static ring seat; (5) There are granular materials in the working medium, and the friction pair enters during operation, and the sealing end faces of the moving and static rings are detected; (6) The design selection is wrong, and the sealing The end face pressure is low or the sealing material has a large cold shrinkage. The above phenomenon often occurs during trial operation, and sometimes it can be eliminated by appropriately adjusting the static ring seat, but most of them need to be disassembled and replaced, and the seal is replaced. 3.

Sudden leakage during normal operation. A few of the sudden leakages of centrifugal pumps during operation are due to normal wear or have reached the service life, and most of them are caused by large changes in working conditions or improper operation and maintenance. (1)