We have two old Oxford 500s with that type of quench ball valve. And on both
systems we've popped one of the quench valves (during fills into our piping,
since installing a helium recovery system). We've pushed the balls back
in as much as possible, but they do sit a bit higher than they used to.
We didn't think it was a problem because the boiloff from both systems goes
through a back pressure regulator. The pressure between the magnet and the
regulator is kept at ~0.5PSI. So it seemed like the systems can't be leaking
much. We recently got a leak detector, but I've never specifically checked
the quench valves before today. But just now I checked the popped quench
valve on one of them (which has popped multiple times) and there's absolutely
no detectable leak - from either quench valve or any of the other clamps/o-rings.
We also have an old Magnex 600, on which one of the quench valves has opened
during fills. I also checked that one and couldn't find any leak. I haven't
checked the other Oxford 500 yet because experiments are running on it.
So I can't find any leaks, but maybe it would be a good idea to either replace
the o-rings or get the upgraded Bruker quench valves anyway.
-Robert
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Received on Fri May 12 2023 - 11:51:39 MST