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CO2 and Needle Valve

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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CO2 and Needle Valve

Unread postAuthor: KyleWoodall » Sun Aug 17, 2008 10:30 pm

Wondering if it would be a bad idea to regulate co2 out of a paintball co2 cartridge(the refillable ones) with a needle valve to a chamber. Is it feesible or would it be dangerous? I think the bottles have really high pressure on them, but if I could find the fitting to take the bottle down to 1/4 or 1/8 inch, I could just open the needle valve and watch the guage on my chamber untill it had the appropriate pressure. Seems like it would work in my head, but wanted to get some expert advice...
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Unread postAuthor: brother361 » Sun Aug 17, 2008 11:20 pm

ummm if you could regulate the pressure very low you should be fine
keep in mind there not made to be used in high pressures
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Unread postAuthor: ammosmoke » Sun Aug 17, 2008 11:27 pm

Erm, you might want a pressure regulator... From a paintgun or something from beveragefactory.com. Search regulator.
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Unread postAuthor: grumpy » Mon Aug 18, 2008 6:06 am

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Unread postAuthor: KyleWoodall » Mon Aug 18, 2008 8:47 am

I like the idea of the regulator from lowes, but that is a lot of money. I was hoping the use of a needle valve would eliminate the need of a regulator.
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Unread postAuthor: potatoflinger » Mon Aug 18, 2008 8:57 am

KyleWoodall wrote:I like the idea of the regulator from lowes, but that is a lot of money. I was hoping the use of a needle valve would eliminate the need of a regulator.

It's probably a bad idea to not use a regulator because if you use just a needle valve, some liquid CO2 could get into your chamber, and then when you shut the valve and stop putting CO2 in the chamber, the pressure will continue to rise, which isn't good at all.
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Unread postAuthor: KyleWoodall » Mon Aug 18, 2008 9:19 am

Thanks for the info guys...Guess I will find me a regulator...
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Unread postAuthor: grumpy » Mon Aug 18, 2008 9:29 am

if you have any paintball shops around you check with them, people are always buying markers and upgrading . they might have one that they swapped out for someone, they will sometimes sell them cheap cause nobody wants them. just make sure it will handle co2 , not all regs can take co2. you would also need an asa to screw the tank into and then attach the reg.
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Unread postAuthor: DYI » Mon Aug 18, 2008 11:19 am

If it weren't for the whole liquid CO<sub>2</sub> problem, I'd say yes. Actually, Larda uses a needle valve in place of a regulator on his 200x hybrid - just open it slightly, and wait until the SCUBA tank pressurises it to the right level, then turn it off. As long as your chamber can survive the full tank pressure, it's perfectly fine to use a needle valve in place of a regulator in this case.
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Unread postAuthor: psycix » Mon Aug 18, 2008 4:03 pm

DYI, if the chamber could take the full tank pressure, why not run it on that pressure then? :D

Also, it does involve a great risk if the chamber cannot handle that pressure and you are using the needle valve type of filling. A popoff is a real need, one twist too far or some other tiny mistake, and your chamber gets filled with pressures you do not want to be in it.
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Unread postAuthor: DYI » Mon Aug 18, 2008 5:17 pm

DYI, if the chamber could take the full tank pressure, why not run it on that pressure then?


Well, I'm assuming he needs a lower pressure for some reason (perhaps he doesn't want to kill his opponents in paintball?), or he wouldn't be asking how to regulate it in the first place :wink:
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Unread postAuthor: KyleWoodall » Mon Aug 18, 2008 8:04 pm

I am wanting to build a gun that can be taken out and not need a charge it with an air compressor. I have not designed the gun yet, but I believe it will need low pressure to accomplish what I need(maybe 30-50 pounds pressure in a small chamber). I plan on making a gun that has shoots a spike out and retracts back into the barrel after each shot. I am plan on using it to...aerate my lawn.....
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Unread postAuthor: Hotwired » Mon Aug 18, 2008 8:31 pm

Umm yep that's not new here or in the world of industrial tools.

Can't be much different to that, basically a pneumatic cylinder with a return spring and instead of the rod moving something it's directly used for work.

A paintball regulator could be the easiest way to get the pressure down, a real regulator at any rate, a manual valve into a chamber you only want at 50psi is not going to be a happy bunny if it ends up getting 900psi.
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Unread postAuthor: KyleWoodall » Mon Aug 18, 2008 8:51 pm

No doubt, I am trying to build it for my Dad. I doubt he will reinburse me for my troubles, So I am lax to buy an exspesive regulator. I have been searching craigslist in hope to find a cheap paintball gun that I can rob parts off of.
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Unread postAuthor: psycix » Wed Aug 20, 2008 7:45 am

DYI wrote:Well, I'm assuming he needs a lower pressure for some reason (perhaps he doesn't want to kill his opponents in paintball?), or he wouldn't be asking how to regulate it in the first place :wink:

Instead of dropping the pressure, reduce chamber volume then.
More efficient.
And why use a chamber material that may be overkill?
No-one is using a stainless steel chamber on a gun which is never used above 30 psi. On such pressures, it would be way more practical to build it out of pvc, its cheaper, lighter and just as safe, as long as the pvc is rated high enough.
If you are going for the heavier chamber, then make it smaller and do not regulate down that pressure.
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