Cryo + Firesafe Sealing Material

[ammar20030]

Guys,
I was think about using Virgin PTFE as the sealing gasket for my valve but my project requires valve to be both cryo + firsafe. Now the only thing that comes to my mind is graphite but i have tried that and the valve leaks. Do you guys have any suggestions on what to use ? Is it a special kind of graphite coz i tried it with 99% pure graphite gasket. Please advise

 

[itascot]

what type of valve are you looking at solving the problem on, where will the gasket be, will it be full dymanic function, static or semi-static & what is service liquid...
Pure graphite with internal armour are used on triple offset butterfly valves (between disc & sealing ring).
If you can narrow the above points down, we may be able to assist.
Ciao,