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How to solve the fracture of O-ring

How to solve the fracture of O-ring

June 22, 2020

What should I do if the ring is broken? How to know if the O-ring is broken? How to solve this situation?

The first is visual inspection. The key step in failure analysis is to thoroughly inspect the mechanical damage of the o-shims. Obviously, all three O-rings are damaged, which will inevitably lead to leakage.

It is necessary to check in time whether the o-rings have obvious expansion, hardening, softening, foaming, compression deformation, brittleness or loss of tensile strength. Very simple, compared to other obvious injuries. For these reasons, the chemical and thermal incompatibility of these sealants can prove to be not the root cause of failure.

Analyzing the fracture, the failure of the o-ring was most often in the process of assembling the o-ring. In this case, the o-ring needs to pass the leak test, and it must be used for a few weeks. Damaged o-ring seals are not possible. In addition, O-rings must also be intact during installation and initial pressure testing.
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O-ring damage is generally caused by tearing, which spreads from the initial torsion point. In this case, a portion of the O-ring seal is crushed in the assembled metal parts, usually by accidentally spraying the groove during installation. Damaged O-rings can show obvious signs of mechanical damage, including: some are severely crushed, O-rings are missing, except that the cross-section is a semi-circle, and so on. In some cases, a compact period will damage the O-ring during the initial leak test, which is due to the shrinkage of the initial sealing rubber ring. However, there is no evidence of any shrinkage of these failed seals.