miniature CO2 pressure regulator

This topic has 19 replies, 9 voices, and was last updated 30 July 2014 at 12:29 by Ian S C.

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27 July 2014 at 16:50 #23427
mike T
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@miket56243
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27 July 2014 at 16:50 #158879
mike T
Participant
@miket56243
I need to make, or buy, a miniature pressure regulator to reduce the pressure from a 16 gram sparklets co2 bottle (liquid co2 is about 850 psi or 58 Bar) to 90 psi or 6 Bar. The regulator needs to be small.

Can anyone help with the design or offer a suitable source of such a regulator.

I found a possible supplier in the States, it was not cheap, but the cost of shipping and customs duty would then double the price.

Thanks

Mike
27 July 2014 at 17:59 #158883
Michael Gilligan
Participant
@michaelgilligan61133
Mike,

Here is something very small … but probably not cheap

MichaelG.
27 July 2014 at 22:54 #158903
Anonymous
Airgun and Paintball regulators are pretty small, not too hard to make and there's plenty of info/designs out there such as

**LINK** and **LINK**

sorry another hobby blinded me, you probably want a constant one not an intermitttent.

Edited By Mick Berrisford on 27/07/2014 23:08:19
28 July 2014 at 00:13 #158906
Martin 100
Participant
@martin100
**LINK** (or any other bike shop)

Not 100% sure if any of these are regulated regardless of price or if, as I suspect, it's just a case of an application of Boyle's law. (It's certainly possible to overpressure a small diameter road racing tube rather than a fat mountain bike one)
28 July 2014 at 08:24 #158912
mike T
Participant
@miket56243
Thanks for all the advice and help

Martin, the bike tyre inflation valve do not regulate, they simply dump the contents into the tyre

Michael G These are the smallest pressure regulators ever, but the price is astronomic.

Mick B The paintball regulators look to be exactly what I am searching for. Do you have any further design details so I can attempt to build one without to many iterations?

Thanks

Mike
28 July 2014 at 09:41 #158917
Roderick Jenkins
Participant
@roderickjenkins93242
Mike,

There are some here. Some of these appear to be flow regulators rather than pressure. I'd be cautious about the paintball option, it would seem these use a pressurised air reservoir, whereas as you know, CO2 is stored as a liquid.

HTH (a bit)

Rod
28 July 2014 at 12:58 #158926
Trevor Wright
Participant
@trevorwright62541
Mike,

Do you want a flow regulator or pressure regulator?

The paintball description is a pressure regulator but the others shown are flow regulators. The difference being a flow regulator will match the inlet pressure if the outlet flow is shut off, but a pressure regulator will hold the 6 bar you require.

I make some pressure regulators for another hobby as there is no equivalent that can handle the flow rates we require, without freezing up.

Will post some pictures if any one is interested. You are welcome to the plans – have tried to get them made elsewhere but with no success. They are about 75mm x Ø30 and weigh 100grams.

Trevor
28 July 2014 at 13:44 #158928
mike T
Participant
@miket56243
Thanks again everybody.

It is definitely a pressure regulator that I wish to build. I wish to achieve a reasonably constant 6 bar pressure and will only consume the C02 intermittently. so freezing up of the bottle may not be a such a problem for me.

I have found several diagrams of paintball pressure regulators, but they do not give the important information such as control spring sizes and rates.

Trevor I would appreciate a look at your pressure regulator plans, I am sure they would be a perfect starting point. I will message you with my e-mail address.

Thanks

Mike
28 July 2014 at 14:54 #158929
Michael Gilligan
Participant
@michaelgilligan61133
Ooops !!

Inserted a clip of Neil's post … but it's messed-up the page layout.

I have tried, and failed, to edit it out … I can delete the content, but it leaves the "frames" in place.

Would a Moderator kindly attend to this.

Thanks

MichaelG.
28 July 2014 at 15:20 #158931
Les Jones 1
Participant
@lesjones1
I think this is the complete text of Neil's post.

"
Michael Gilligan passed on two files from Eclipse and I created an article to 'host' them here:

Use-of-magnetic-chucks-for-milling-and-turning

It does take me a while to do this, but I don't mind putting up articles like that from time to time. If anyone is interested in having a file or files hosted in this way, please email me with the details."

If you highlight the text that is partly masked by the adverts, copy it then past it to Notepad it seems to copy most of the hidden part as well as the visible part. When I did this the only bit is missed was the last 3 letters of "details"

Les.
28 July 2014 at 15:31 #158932
Michael Gilligan
Participant
@michaelgilligan61133
Thanks Les

Strangely; although I highlighted only the text of Neil's post [plus the date-stamp above it]: When I pasted it in, the left box [with Neil's smiling face, etc.] was inserted too.

HTML works in mysterious ways

… I will try not to do that again.

MichaelG.
28 July 2014 at 16:45 #158937
Trevor Wright
Participant
@trevorwright62541
Have contacted Neil, just waiting for a reply to get details of how to present the photos/pdfs

Trevor
28 July 2014 at 16:55 #158938
mike T
Participant
@miket56243
Hello Trevor

Any chance you could let me have a look first, rather than having to wait until they get published? You did offer !!

Did you get the private mail with my e-mail address

Thanks

Mike
28 July 2014 at 18:32 #158944
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Trevor Wright on 28/07/2014 16:45:55:

Have contacted Neil, just waiting for a reply to get details of how to present the photos/pdfs

Trevor

.

Thanks Trevor

MichaelG.
28 July 2014 at 18:53 #158945
Trevor Wright
Participant
@trevorwright62541
Mike,

email sent.

Trevor
28 July 2014 at 20:55 #158952
mike T
Participant
@miket56243
Trevor,

Thanks

Mike
29 July 2014 at 17:44 #159020
Neil Wyatt
Moderator
@neilwyatt
I had to delete the post. I was able to resize the columns, but they appeared full width anyway

And yes, I have responded direct to Trevor.

Having sucessfully refurbed three LPG regulators and seen how they work, I must admit I have mused on making a small two-stage butane regulator on the same lines..

Neil
29 July 2014 at 18:31 #159030
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Neil Wyatt on 29/07/2014 17:44:14:

I had to delete the post. I was able to resize the columns, but they appeared full width anyway

.

Thanks, Neil

Weird behaviour isn't it.

MichaelG.
30 July 2014 at 12:29 #159112
Ian S C
Participant
@iansc
Neil, have a look through Bog's works, probably in another forum, he has a design for an LPG flow regulator for model engines. Ian S C
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