How to handle welding-induced damage to the flange surface of a steel-lined fluoroplastic ball valve so as to prevent leakage of the medium?
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What should be done if the sealing surface is damaged because the welder failed to unscrew the flange during welding? Can it still be used?
It can no longer be used; it cannot be repaired and must be replaced with a new one
It has no value for repair; it is recommended to replace it with a new valve, which is not expensive.
It can prevent external leakage, but not internal leakage (as the medium can penetrate the PTFE lining and directly corrode the carbon steel ball valve). If it were possible to prevent both types of leakage, there might be a solution, but the cost would be unreasonable; it’s better to replace the 50-series ball valve. This one can be used elsewhere as a carbon steel ball valve.
It can no longer be used; the maximum temperature tolerance of PTFE seals is around 120 degrees. Many people claim on Baidu that PTFE can withstand temperatures over 200 degrees, but when used in valve seals, leaks occur if the temperature exceeds 120 degrees for an extended period. Therefore, when considering PTFE for use in valves, it is necessary to take into account not only the material’s temperature tolerance but also its sealing properties~
This is not PTFE! F46 is pretty much 120 degrees!
Domestic valves are not expensive either; just replace them and that’s it! !
Replace it with a new one; the cost of repairs is higher than the price of buying a new valve