Regarding the valve Z58140, I have some history with this ... above the part number,
it says Nur fur installation, aka "only for installation." I should have taken that
injunction at face value. I bought a couple of these figuring I could use them to
connect some Oxford magnets to our helium recovery system, and leave them in place
both during fills and between fills, like I did with Bruker magnets and Bruker check
valves. However, this did not work in practice. At normal between-fill outflow rates,
the gas flow on my flow meter would seesaw wildly every couple of seconds. It was not
a good look. I think this valve is designed for popping open under much higher than
normal flow, and staying open only when that flow and back pressure is sustained.
Probably optimized for the conditions encountered during installing the magnet. So
they cost me ca $800 each, but not fit for my intended purpose. Caveat emptor.
________________________________
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of Bob Berno <bberno_at_mcmaster.ca>
> Sent: Wednesday, February 21, 2024 10:04 AM
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: Re: [AMMRL] problems with pulsecal --> One way valves for helium exhaust
Hello Karel,
I can't comment on the main topic of your email, but I wanted to answer
your questions about the one-way valve on your helium exhaust port.
I don't know what the fittings look like at the top of your helium
manifold, but from the photo you provided I suspect you have some sort
of adapter that allows you to connect a piece of Tygon (or similar)
tubing to the check valve you showed in your photo.
Basically, you want to replace the adapter+small check valve with
something like the silver one-way valve shown in the attached photo.
Fortunately, this photo also shows the Bruker part number, for your
ordering convenience. About four years ago it cost about $365.00 CDN.
This silver one-way valve is what we have on all but one of our
magnets. However, you might not be able to attach this directly to your
existing manifold because it may be looking for something which has a
KF-25 type fitting. Then, you would also need a KF 25 adapter that will
allow you to screw one-way valve into place. Off hand I don't seem to
have the part number for that.
One other option would be to get a different one-way valve which already
had the KF-25 fittings on both ends. A few years ago when Bruker was on
site to re-energize an old magnet, the magnet engineer installed a
one-way valve like the one in the photo shown in this link:
https://mcloud.mcmaster.ca/s/SM6963SwWSof4WK
It's a little hard to see, but it looks like it has Part Number: Z58140
I have no idea what this costs.
I hope this helps.
Bob.
--
Dr. Bob Berno
Manager, NMR Facility
McMaster University, ABB-156
1280 Main St. West
Hamilton, ON L8S 4M1
T: 905-525-9140 x24158 or x24686
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Received on Wed Feb 21 2024 - 10:21:11 MST