ball valves BS6364 with cavity provision relief
ball valves BS6364 with cavity provision relief
(OP)
Hi,
One of our customer ask us ball valves for cryogenic service according to BS 6364 and he mentionned that valves must have a cavity provision relief.
Does anybody know what it is because manufacturer doesn't know.
Tahnk you for your help
One of our customer ask us ball valves for cryogenic service according to BS 6364 and he mentionned that valves must have a cavity provision relief.
Does anybody know what it is because manufacturer doesn't know.
Tahnk you for your help





RE: ball valves BS6364 with cavity provision relief
I am not sure about the practical solution (block and bleed or inside automatic over/past seals ?). I am sure, however, that if your manufacturer has not supplied for this type of cryogenic service before, and has inadequate experience or knowledge to check out this requirement himself, I would'nt go with this supplier for such a project.
RE: ball valves BS6364 with cavity provision relief
RE: ball valves BS6364 with cavity provision relief
Steve
RE: ball valves BS6364 with cavity provision relief
RE: ball valves BS6364 with cavity provision relief
RE: ball valves BS6364 with cavity provision relief
Could you elaborate on that?
RE: ball valves BS6364 with cavity provision relief
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RE: ball valves BS6364 with cavity provision relief
After more than a few years' cryo design (cold boxes, warm end, customer sites) experience I've never seen a ball valve specified by the provider. It's all extended stem (as you correctly state, but forgot to mention that these valves are buried in perlite or under 3"+ of insulation if not VJ-ed), bonnet pressurized globes for control on the liquid side and butterflies for the "warm" gases.