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What Are The Damage Types Of Mechanical Seals?
Mar 27, 2018

What are the damage types of mechanical seals?


What are the damaged forms of mechanical seals? Is mechanical seal aging dangerous?



a) Wear. The friction between the seal and the metal surface generates friction that causes the seal to wear. Oil contaminants (especially metal particles). Excessive roughness of the metal surface, too tightly packed and other factors accelerate this wear.


b) Crevice extrusion deformation causes the seal to liquefy under high pressure and enter the seal surface gap. The relative movement between the seal and the seal groove promotes this process. The crevice extrusion causes complete damage of the seal, the surface tears or breaks, and plastic deformation may also occur. Add sealing ring to avoid extrusion.


c) eccentric wear. This is one of the main reasons for the damage of the seal. The seal itself is eccentric, the support surface of the seal is eccentric, and parts of the mating surface of the reciprocating motion part and the seal part are napped and subjected to radial load, etc., all causing partial wear.


d) Material aging. Seals that are too long for use, stored for too long or otherwise oxidized and harden, become brittle, lose their elasticity, and no longer seal.


e) Turn over. This type of failure uses a lip seal (such as a seal in a hydraulic cylinder), which is characterized by the seal being partially extruded from the groove. When hydraulic equipment is in operation, the pressure in the sealing groove is very high. This pressure acts on the root of the seal, the root is worn out, and then under the action of friction, the seal is turned over and escapes from the sealing groove. The sealing lip is cut or broken and the seal is completely damaged.


f) Valley cracking. The valley portion of the lip seal (as indicated by the arrow in Figure 2) is a stress concentration point and is easily cracked when subjected to a pressure shock.


g) Reverse. When the lip seal generates a large frictional force during movement, full or partial twisting may occur.



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