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Cryogenic, Low Pressure RV

Cryogenic, Low Pressure RV

Cryogenic, Low Pressure RV

(OP)
Anyone know of a RV that can do this?

Inlet: 2"
Outlet: 3"'
Media: Helium gas
Temperature range: -440 F to 70 F
Set Pressure: 0.25 psig
Flow Required:  12,000 SCFH at -300 F

RE: Cryogenic, Low Pressure RV

Just off the top of my head I would say talk to protectoseal.   You really might want to go with a buckling pin if you are not setting it off all the time.  Look at the  PIN-TECH BUBBLE-TIGHT < 500 PPM, PRESSURE RELIEF VENT
Series No. 56000

My two cents

StoneCold

RE: Cryogenic, Low Pressure RV

(OP)
Thanks SC.  I called them up, and although they don't have any cryogenic RV's, they seem interested in designing something.  

Any other leads would be appreciated.

RE: Cryogenic, Low Pressure RV

You might have trouble with the -440F.  It seems more common for cryogenic valves to stop at around liquid nitrogen temps, around -325F.  Other problem is the extremely low 0.25 psi set pressure, that's uncommon as well.  

http://www.regoproducts.com/cryoflow/cg/pdfs/relief.pdf

Not sure how low the Flowsafe valves go.  http://www.flowsafe.com/cry.htm

http://taylorvalve.com/ can make you a valve with materials accepted for cryo service, but they haven't tested them that way.

Best bet is probably an austenitic stainless body, like 316 SS.
  
Other materials to look for: Hastelloy, Inconel, Monel, aluminum (tho I haven't seen any Al valve), bronze/brass.

Only seal material I know of is teflon, but I've seen lots of different numbers on the lower temp limit.  

Good luck.

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