I need some help/advice on the methods used in cryogenic sealing. I am in the process of designing a cryogenic connector (40 bar) for use with liquid oxygen, nitrogen and argon, and need some advice on the best sealing interface to use. My all brass connector has a 'nut' on a series of ball bearings being pulled up on a flange via a special spanner. At present i have used an equilateral triangle cross section virgin ptfe seal clamped between two taper's which works ok at ambient but leaks at cryogenic - when the seal gets cold!! What other cross sections are used in cryogenic sealing to better allow for the shrinkage and are there any other materials i can use? Are there standard seals out there that i can incorporate into my design?
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