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Common failures of O-rings and related treatment methods  

2021-11-10
Common failures of O-rings and related treatment methods
1, leak

performance: 

① damage during installation, that is, scratches when the edges and corners of the spouse pass through the hole;

②The amount of compression is too small;

Solution: 

①Process the end of the shell into a chamfer during installation to ensure that the O-shaped rubber sealing ring is not damaged by shearing during installation;

② Increase the amount of compression appropriately;
2, big leak leak

performance: 

①O-shaped rubber sealing ring loses its elasticity;

②The surface of the O-shaped rubber sealing ring suffered severe friction damage;
③The O-shaped rubber seal is excessively contracted;
④The O-shaped rubber sealing ring is corroded and swelled by the sealing medium;
⑤The gap value is too large, and the O-shaped rubber sealing ring is squeezed out;
⑥The cross-section diameter of the O-shaped rubber seal ring is inconsistent with the unilateral thickness, which causes distortion and damage during movement;

Solution: 

①Improve the material performance of O-shaped rubber sealing ring and extend the service life;

②Appropriately increase the hardness of the O-shaped rubber sealing ring compound and reduce the coefficient of friction;
③In dynamic use, the inner diameter of the O-shaped rubber seal should be slightly larger than the shaft diameter;
④Improve the oil resistance of the O-shaped rubber sealing ring compound;
⑤Reduce the gap value
⑥Strengthen the size control and product inspection of the O-shaped rubber sealing ring model;
3, O-shaped rubber sealing ring early damage

performance: 

① O-shaped rubber sealing ring is excessively stretched and breaks prematurely

②Damage during installation
③Excessive compression, severe friction or shear
④The O-shaped rubber seal ring is selected or the groove size is incorrect

Solution: 

①In dynamic use, the inner diameter of the O-shaped rubber sealing ring should be slightly larger than the shaft diameter;

② Only use metal guide bushes when installing;
③Reduce the amount of compression;
④The correct selection of the O-shaped rubber seal ring and groove fit
4, low temperature leakage
performance: O-shaped rubber seals lose their elasticity at low temperatures
Solution: Improve the cold resistance of the O-shaped rubber sealing ring compound
5. Excessive friction

performance:

① The amount of compression is too large;

②O-shaped rubber sealing ring overflow or poor oil resistance, excessive swelling;

Solution: 

①Reduce the amount of compression or correct the groove size to improve the smoothness of the metal surface

②Use retaining ring to prevent O-shaped rubber seal ring from overflowing or improve the oil resistance of O-shaped rubber seal ring material;