Weird CGA320 valve?
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Old 03-03-2013, 05:04 PM   #1
fattboa
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Weird CGA320 valve?


Hello all. Bought this used 20# Co2 cylinder a while ago. I believe it came from a recently closed restaurant store? I saw the CGA320 and said schwing. However my euphoria was short-lived and abruptly came to an end when I tried to adapt a Co2 regulator (all Co2 regulators are British connection over here and all cylinders have the CGA connection - you try to solve the mystery).
After visiting the 10th store and convincing a guy to finally sell me a CGA320 nut and nipple - it did not fit. Apparently it is the first time they saw a CGA320 valve like this one? They will not re-valve it because they want me to buy a new cylinder and they have monopolized the market. Sooo off I go to ask some capitalists for help.
The CGA320 nut can be tightened over the threaded valve but the nipple would not go in because it is too small? Is there some sort of adapter already inside the CGA320 valve? The internal diameter of the valve is roughly 8mm and outer diameter is 13mm. There are only two stores that deal with these things. One has employees that know nothing. The other has weasels.
Thank you
Sorry about the mess.
http://s20.postimage.org/vc88f0szx/20130303_204037.jpg
http://s20.postimage.org/67h81ltjh/20130303_204044.jpg
http://s20.postimage.org/lu8hez7bh/20130303_204057.jpg

Ok after looking at CGA320 nipples on the internet, mine seems different? Is it even a CGA320 nut and nipple??? Outside diameter is roughly 11mm
http://s20.postimage.org/gy4una765/20130303_211801.jpg

Last edited by fattboa; 03-03-2013 at 05:27 PM.. Reason: EDIT
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Old 03-03-2013, 07:15 PM   #2
Bettatail
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It is not CGA320 stem.
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Old 03-03-2013, 10:22 PM   #3
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Quote:
Originally Posted by Bettatail View Post
It is not CGA320 stem.
+1.

Good luck with your search.
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Old 03-04-2013, 12:53 AM   #4
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Where are you? I see your location says Kuwait, so I'm wondering if you got something with ISO or an EU specified connection (I really don't know what code would have authority there)
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Old 03-04-2013, 12:54 AM   #5
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Just found a very useful link on the different types of connections: http://www.uk.airliquide.com/file/ot...forco21942.pdf
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Old 03-04-2013, 10:33 AM   #6
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Quote:
Originally Posted by Bettatail View Post
It is not CGA320 stem.
Well so much for the premier gas company in Kuwait being able to identify a CGA320 stem. Although from the link given by danakin it seems similar to the Tailpiece long (120 mm) G1/4A cone. Anyone can confirm?
Quote:
Originally Posted by Darkblade48 View Post
+1.

Good luck with your search.
Thank you but I'm probably giving up on it. I've spent more than 200 dollars with nothing to show for it. Time to cut losses. Nobody will buy this equipment anyway so it's a complete loss.
Quote:
Originally Posted by danakin View Post
Where are you? I see your location says Kuwait, so I'm wondering if you got something with ISO or an EU specified connection (I really don't know what code would have authority there)
Well, its more of a laissez-faire affair rather than rules. It depends on the mood of the person ordering equipment for the companies.
In other words, the all Co2 regulators are British Standard 341 no. 8 and all the rest are CGA connections. You'd think they'd sell adapters from BS to CGA or at least BS cylinders but they don't...
Thank you all for your help. You were more helpful than the whole industrial area over here.
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Old 03-04-2013, 06:01 PM   #7
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I'm sure you could find a machine shop that would fab one up for you for ~30 bucks.
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Old 03-04-2013, 06:20 PM   #8
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Quote:
Originally Posted by danakin View Post
I'm sure you could find a machine shop that would fab one up for you for ~30 bucks.
A CGA320 nut and nipple?
It won't be a problem. The problem now is figuring out what valve is on the cylinder. It has CGA320 stamped on it but the stores say it is unlike any CGA320 valve they have seen (which is not to say much about their experience)
So I have to figure out what is it since they do not know. They also told me they cannot change the valve on the cylinder to a CGA320 one but I am sure they said that so they can sell me a new cylinder instead.
Decisions, decisions...
I checked the PDF you linked to which is mighty helpful but I cannot identify what is on the the cylinder.
Any ideas at all? I'm quite desperate.
Or should I just bypass it all and have a machine shop fabricate a nut/nipple that would fit the cylinder as it is? One shop told me he would decrease the diameter of the British standard fitting already on the regulator. However, would the decreased wall diameter of the fitting cause any issues?
Nobody over here has any idea and I would really hate to deal with metal failure at 1000+ psi.
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Old 03-04-2013, 07:25 PM   #9
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the cylinder valve do look like a cga 320 connection port to me.

you can buy one cga 320 nipple and nut online, just contact the online retailer see if they can ship to Kuwait before you place order.
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Old 03-04-2013, 08:14 PM   #10
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Quote:
Originally Posted by Bettatail View Post
the cylinder valve do look like a cga 320 connection port to me.

you can buy one cga 320 nipple and nut online, just contact the online retailer see if they can ship to Kuwait before you place order.
I guess the CGA320 nipple/nut the premier gas/oxygen company in Kuwait sold me is not a CGA320 nipple/nut after all.
Many thanks
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Old 03-06-2013, 05:10 PM   #11
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I think I found it.

Will this work on the above cylinder? I believe it will.
Btw I may connect it with no washer since there are none in the whole of Kuwait. Bad idea I believe?
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Old 03-06-2013, 07:21 PM   #12
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Quote:
Originally Posted by fattboa View Post
I think I found it.

Will this work on the above cylinder? I believe it will.
Btw I may connect it with no washer since there are none in the whole of Kuwait. Bad idea I believe?
Looks like a CGA320 nut and nipple.

You will need a washer, or else it will leak.
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Old 03-06-2013, 07:55 PM   #13
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Quote:
Originally Posted by Darkblade48 View Post
Looks like a CGA320 nut and nipple.

You will need a washer, or else it will leak.
I'll search around for one.
Finally after a few months it is complete. Thank you for your sincere help.
Just have to get over the fear of 1000+ psi.
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Old 03-14-2013, 01:50 PM   #14
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Ok an update
Didn't find a washer at both gas companies.
They suggested rubber o-rings. Tried one that was too small and it leaked.
Tried a larger one and after torquing the nut it still leaked. Tried to get it off and it damaged the threads on the CGA320 valve. Although It did work for a few seconds after a 6 month wait
Now what to do? Cannot find another CGA320 cylinder and they cannot replace the CGA320 valve. Can the damaged threads be repaired?
Or I might as well give up and sell everything since it's becoming quite aggravating?
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Old 03-14-2013, 07:12 PM   #15
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Are you talking about this type of rubber o-ring? This thing kind of worked.... I used washers and not the rubber o-ring, maybe they wanted you to use this size o-ring.

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