On our older Oxford magnets we have installed these higher flow valves from
generant. They have cracking pressure of 10 mBar (0.15 psi). They just need
a KF25 to NPT adapter that we get at Loco Science. They are in line and
upstream of our diverter for switching between routine operation and fills.
They are brass and significantly heavier than the valves from Bruker.
https://www.generant.com/product/check-valve-cv/
Check Valve (CV) – Manufacturer of Relief Valves, Check Valves, Needle
Valves, Pressure Regulators, LTAP and Cryogenic Products
David Jones
Associate Professor
Dept. Of Pharmacology
University of Colorado
School of Medicine
Tel (303)-724-3600
On Feb 22, 2024, at 8:59 AM, Mike Lumsden via groups.io <Mike.Lumsden=dal.ca_at_groups.io> wrote:
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 mbar 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 - 09:21:20 MST