I use Control Air Inc. back-pressure regulators (part number 700BP;
McMaster-Carr 4783K53). You need to buy a pressure gauge separately. I
believe this is the same type used by Yale's NMR facility; if not, it has
the same specs as I based my design on Yale's.
-Scott
On Wed, Sep 6, 2023 at 2:52 PM Xiaoyan Sun via groups.io <xsun9_at_ncsu.edu_at_groups.io> wrote:
> Any recommendation on the brand and type of back pressure regulator?
>
> On Wed, Sep 6, 2023 at 4:38 PM <gregory.wylie_at_chem.tamu.edu> wrote:
>
>> HI Yuan
>>
>> As Ken says the companies offer little help with this. Each site is very
>> different so without really knowing your setup this is hard to answer.
>>
>> I have talked to a couple of sites that have these all metal systems (no
>> bag). One issue is that they connected everything up and then put the 2in
>> line into a 1/4in hole on the tank. So when attempting to fill the system
>> they had lots of back pressure. So assuming your systems are plumbed
>> correctly I think the PSI value that your compressor turns on at 2.5 needs
>> to be lowered. Magnets will not vent normally at that PSI. My understanding
>> is that when there is a small pressure in the lines and tank the compressor
>> should cycle on and off (can potentially pull on your magnets this is why
>> back pressure controllers and such are used). During a fill the lines can
>> not become too pressurized or else normal boil-off will not happen, this
>> would be an issue for the second magnet not being filled.
>>
>> Hopefully you will get more info from those who have this type of system.
>> We have high pressure here with a gas bag.
>>
>> Greg
>> Gregory P. Wylie, Ph.D
>> NMR Facility Manager
>> Texas A&M University
>> Department of Chemistry
>> P.O. Box 30012
>> College Station, TX 77843-3255
>> gpwylie_at_tamu.edu
>> 979.458.0705 (voice)
>> 979.845.4719 (fax)
>> 706.206.0007 (cell)
>>
>>
>
> --
>
> *Jennifer Sun*
>
> Senior Research Scholar , Molecular Education, Technology and Research
> Innovation Center
>
> Joint Research Assistant Professor, Department of Chemistry
>
> North Carolina State University
>
> 2620 Yarbrough Drive
>
> Raleigh, NC 27607
>
> (919) 515-1160
>
> *xsun9_at_ncsu.edu <xsun9_at_ncsu.edu>*
>
>
>
>
>
--
Dr. Scott Burt
Professor
NMR Facility Manager
Department of Chemistry and Biochemistry
Brigham Young University
C414 BNSN / C008A BNSN
Provo, Utah 84602-5700
Phone: (801) 422-2404
Fax: (801) 422-0153
chembio.byu.edu/nmr-facility/
email: scott_burt_at_byu.edu
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Received on Wed Sep 06 2023 - 14:33:15 MST