Hello - regarding the one-way valve discussion, we also have a mixture here
at Dalhousie (all 4K magnets). Older Bruker magnets have the brass
lower-flow valves which we remove prior to a fill. These are from
Circle Valve which, in our case, look to have a FNPT-->KF flange on one end
and a barb fitting on the other. The cracking pressure is listed at
10 m bar A recent Ascend magnet was fitted with Z52395 which we leave
on during fills. I read somewhere the cracking pressure for this valve
is 15 mbar. To make matters more interesting, v1 of the Bruker document "Helium
Recovery for NMR Systems" listed the exhaust valve for 4K magnets as part
number Z58140 (the "installation only" valve) but in v2 this was updated
to Z52352.
In terms of capturing helium, I too have been wondering if the older magnets
with the Circle Valves should be updated to the higher flow style OR if I
should simply remove them from the back of the magnets and tee them into the
low flow pathway. To replace them, its not clear to me what the proper part
number is as there are three that I know of floating around (Z52395, Z58140,
or Z52352).
Some clarity on these different valves would be most helpful!
Thanks,
Mike
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Received on Thu Feb 22 2024 - 07:59:41 MST