Dual Stage Regulators

Matt F.

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Left C;60660 said:
Extremely nice work! You may want to add and extra check valve between the deal needle valve and the JB BC. It might leak. Get as low a cracking pressure that you can find. Swagelok has some 1/3 psig models. Parker and Clippard has some too, but I'm not sure of their rating. Just remember that 1 psig = approximately 15 psi. It's really 14.7 psi, but 15 psi is just easier to remember.

The reports of the check valve leaking in the JBJ BC have been quite rare though. My 4 year old 52-1-12 with its JBJ BC hasn't leaked.


the swagelok part numbers are:

stainless: ss-2c2-1/3
brass: b-2c2-1/3

stainless is three times the price of brass.
 

Matt F.

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herns;60689 said:
Thanks, Matt.

Even the brass model is also expensive, $25. Do you know cheaper ones other than Swagelok?

clippard makes a cheaper one, but you're going to pay $$$ for shipping/handling from clippard. Also the cracking pressure poses issues if you use a ceramic diffuser.

the swagelok is the best you can get for our application.
 

barbarossa4122

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Hi,

My 253b has a 0-30psi low pressure gauge. Does this mean the regulator can provide more that 30psi working pressure. I am a little confused on this gauges and pressures stuff. Like, why my 253b has a gauge showing 0-30 and others, same model, showing 0-60 ?
 
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Matt F.

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barbarossa4122;60785 said:
Hi,

My 253b has a 0-30psi low pressure gauge. Does this mean the regulator can provide more that 30psi working pressure. I am a little confused on this gauges and pressures stuff. Like, why my 253b has a gauge showing 0-30 and others, same model, showing 0-60 ?

"A" range 0-30psi
"B" range 0-60 psi
"C" range 0-100 psi
"D" range 0-200 psi
"E" range 0-400 psi (iirc)

Are you sure you have a 253B and not a 253A?

Why would you need more than 15-20 psi of pressure anyway? I would stay within the range of your low pressure gauge.
 

barbarossa4122

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VICTOR 7-0155 Two Stage Gas Regulator CGA-320 for CO2
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=390256930478

Why would you need more than 15-20 psi of pressure anyway? I would stay within the range of your low pressure gauge.

From what I have read, the new atomic diffusers need around 30psi to work properly. But, I am running a Concoa at 20psi and it works good enough with 2 atomic new diffusers. The Victor I am running at 25psi.
 

Matt F.

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barbarossa4122;60787 said:
VICTOR 7-0155 Two Stage Gas Regulator CGA-320 for CO2
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=390256930478



From what I have read, the new atomic diffusers need around 30psi to work properly. But, I am running a Concoa at 20psi and it works good enough with 2 atomic new diffusers. The Victor I am running at 25psi.

Ah, I got ya. Yes, those diffusers seem to need more than the ADA cermaic diffusers. Well, a 30 psi "A" regulator, you just proved, works with these, too.

I forgot what model victor you had. it's that weird one model number, which I think is a predecessor of a VTS253A. The way to tell for sure is to email thermadyne directly. They will tell you for sure.

On another note, I know I have retired from regulators, but I did recently pick up a new VTS450A-580, which I am going to build for personal use.

I'm using my two current regulators on my 55 and my Mini-M. This regulator will be a backup.

Here is the SGT 500 in action (on Mini-M):
mini-m1-4006.jpg


here is my VTS253A-1993 (on 55 gallon):
10-11030.jpg
 

Matt F.

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barbarossa4122;60815 said:
Hi,

I got an e-mail from the seller stating the same thing. The "B" is better right ?

I have two "A" regulators and a "B" regulator. Why would an "B" be better than an "A"?
"As" and "Bs" are what you want for our applications.