Cryogenic Valve Seat
Cryogenic Valve Seat
(OP)
Has anybody tried Vespel for Cryogenic valve seats? Any comments on the performance is most welcome.
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RE: Cryogenic Valve Seat
Regards,
'NGL
RE: Cryogenic Valve Seat
I have used Vespel for valve seats but only in nuclear applications where the cost could be justified. These applications were typical power plant valves at water and steam temperatures.
We have made thousands of globe cold box valves and the typical valve soft seat material is Kel-F PCTFE (PolyChloroTriFluoroEthylene). The characteristics are very similar to PTFE but there is some marginal flexability at cryogenic temperatures.
Kel-F was developed by 3M but the only remaining source is Daikin Industries in Japan.
Hope this helps,
ABScott
RE: Cryogenic Valve Seat
RE: Cryogenic Valve Seat
http://www.arkema-inc.com/index.cfm?pag=110
The crystalinity of PCTFE can vary. That maybe the source of the variation in CTE.
What do you consider high pressure?
RE: Cryogenic Valve Seat