This message reaches us timely. We have a 300 MHZ Oxford Magnet with exactly
the same ball valve. Two days ago during a lHe fill the valve "popped" at
the end of the fill therefore pretty much interrupting the He capture.
However, after the fill was completed the ball dropped back to its original
position and I cannot find any sign of leakage using our He-leak detector.
This has never happened before, so maybe we are starting to see some wear
with this valve as well.
The ball sits firm in place and there is no spring pushing it down. This is
different from Bruker's spectrospin-magnets, which have a similar valve,
where the ball is pushed in place with a spring. I would like to remove ours
to figure out the mechanism of the valve but I am somewhat reluctant here.
I would recommend that you get in touch with John Davidson (
https://www.cisnmrservice.com/contact.html ), he might have spare parts.
Kind Regards, Hanno
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Received on Fri May 12 2023 - 07:43:44 MST