Hi All, we too have these “for installation only” valves on
three of our (old) magnets. We also leave them in line during fills and for
normal operation. We do see the oscillation in normal boil off on one of the
magnets but not with the other two. The oscillation is not so bad that I’ve
considered replacing or removing it.
John
> On Feb 21, 2024, at 2:59 PM, brcherry_at_asu.edu wrote:
>
> HI,
>
> We have two of these valves (Z58140) in use on our Magnex magnets and our
> recovery system. A NB and WB both at 400 MHz. They have worked great for
> us. We leave them in line and have valves to divert to capture normal boil
> off or let fill gas travel freely through our heat exchangers. We had a
> little bit of the See Saw described below when we first started using them,
> however after more than a year we do not have that experience anymore. The
> fills now fills go smoothly.
>
> I think the rate at which you fill could be cause. When we use the Bruker
> transfer (smaller diameter) line we have the LHe dewar at about 2 PSI. for
> the next later OD transfer line that came with our Magnex magnets we keep
> the LHe dewar pressure at 1 PSI.
>
>
>
> Brian Cherry
> Magnetic Resonance Research Center
> Arizona State University
>
John Decatur, Ph. D.
Senior Research Scientist, Director of Chemical Instrumentation
and Precision Biomolecular Characterization Facility
Department of Chemistry
3000 Broadway, Mailcode 3179
Columbia University
New York, NY 10027
212-854-2155 (voice)
212-932-1289 (fax)
jdd13_at_columbia.edu
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Received on Wed Feb 21 2024 - 12:47:20 MST