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Sealing of ButtWeld ends for Cryo-Testing of Valves

thread367-85417

Sealing of ButtWeld ends for Cryo-Testing of Valves

Sealing of ButtWeld ends for Cryo-Testing of Valves

(OP)
Dear All,
        I would like to know if anybody has ever faced the problem in object.

    Having to perform cryogenic tests on butt-welding valves, it is not easy to obtain a good sealing of the test caps, due to the particular shape of the ends...
 
    Is it possible to have, somehow, a good (flat) sealing surface, on which the gasket can be centered and compressed properly?
    In addition to this, what kind of material would you use (see also Thread408-82258)?

Thanks and Regards,      'NGL

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