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Idea for pneumatic gun using CO2

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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Idea for pneumatic gun using CO2

Unread postAuthor: -T0OL- » Mon Oct 02, 2006 6:24 pm

ok I'm planning on making a CO2 powered gun my plan was for it to look something like this
Code: Select all
+-----------------+--+------------------+---+\
|                 |  |                  |   | \==================
|                 |  |                  |   | /==================
+-----------------+--+------------------+---+/
                   ^         ^            ^
CO2 tank--^       /          |            |
                  |          |            |
Ball valve--------/          |            |
                             |            |
chamber -------------------- |            |
                                          |
sprinkler valve ---------------------------

and then the last part is the barrel.

my plan was to have a regulator between the ball valve and the CO2 tank so that i could fill the chamber to 100psi or so then close the ball valve and use the sprinkler valve to fire the gun. I dont know if this is the best or easiest way... But what i wanted to know is what can i use to connect the CO2 canister and regulator to the PVC/ABS tubing (is abs or pvc stronger? )?

any help/comments/suggestions appreciated.
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Unread postAuthor: boilingleadbath » Mon Oct 02, 2006 8:21 pm

...that's nothing revolutionary, and I'm sure searching our pneumatic cannon section will show you a whole bunch of examples of (basicaly) this design.

...and for the record, we generaly reccomend using pressure-rated (NSF-PW) PVC. (although ABS is somewhat better mannered in the cold - which might be relevent here)
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Unread postAuthor: -T0OL- » Mon Oct 02, 2006 11:35 pm

yea, it wasnt meant to be anything revolutionary since this will be the first gun i've made. Any ideas what the thing that would connect the CO2 tank to a regulator would be called? (and the regulator to the ball valve if that is a special part)... im currently looking over previous posts to see if i can spot one.
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Unread postAuthor: CS » Tue Oct 03, 2006 12:45 am

Shu-min-a-gona. Thats what its called:-p

Which type of regulator did you intend to use? A air compressor one? If you were to buy one for a paintball tank itd have threads to fit a tank.
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Unread postAuthor: -T0OL- » Tue Oct 03, 2006 12:47 am

I'd buy a regulator from a PB store since i know it would work for a CO2 tank. would the other side of the regulator (non tank side) have just normal threads on it?
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Unread postAuthor: Gnobbes » Tue Oct 03, 2006 10:54 am

Just keep in mind that CO2 comes outcold. I've heard that PVC gets brittle when it gets real cold.

You might consider using copper and steel for this one.
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Unread postAuthor: POS » Tue Oct 03, 2006 11:38 am

how does the rubber of the piston valve react to those extreme cold ?
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Unread postAuthor: -T0OL- » Tue Oct 03, 2006 1:46 pm

at first i was going to use PVC or ABS but i think i will go with copper then just paint it, it handles the cold better and more PSI from what i've heard... and POS did you mean sprinkler valve when you said piston valve?
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Unread postAuthor: )DEMON( » Tue Oct 03, 2006 2:18 pm

Plastic sprinkler valves will also not be a good idea with the constant cold temparature of co2. Piston valves are not very hard to make if you know what you are doing. You could easily use a paintball cylinder as a co2 regulator but then you would need a paintball regulator. These are hard to find, here's the web page with palmers regs.: http://www.palmer-pursuit.com/online-ca ... ilizer.htm

Copper would make a good barrel and piston housing but metal pipe (like plumers use) will make a better chamber and should be able to hold the pressure if you accidently let the full 850 psi into the chamber.
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Unread postAuthor: -T0OL- » Tue Oct 03, 2006 2:24 pm

Ok thanks. would there be any issues connecting copper to steel directly?
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Unread postAuthor: )DEMON( » Tue Oct 03, 2006 2:39 pm

The copper needs compression fittings on the ends. These are threaded so you can connect it to normal metal pipe with galvinized fittings.
Hope you know how a piston valve works. Do lots of research befor you buy and build, this is a big project and you are dealing with high pressures.

The good thing about those palmers regulators is they are adustible. So you could change the pressure from 100 to 500psi. :wink:
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Unread postAuthor: -T0OL- » Tue Oct 03, 2006 3:54 pm

ok thanks, i have read about how pistons and diaphragms work. So if i used a piston that would turn the gun into a coaxial right, instead of it being linear?
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Unread postAuthor: MrCrowley » Tue Oct 03, 2006 4:05 pm

it could or you could do an over-under design using chamber or barrel selaing piston valves.
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Unread postAuthor: -T0OL- » Tue Oct 03, 2006 4:34 pm

Which of the three would be easiest to make and maintain... or do they each have pro's and con's

EDIT:: also would i need a regulator on a 12g cartrige?
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Unread postAuthor: MrCrowley » Tue Oct 03, 2006 5:40 pm

over-under barrel sealing piston.,mind you if you had a chamber sealing piston you can fill up the co2 from the chamber.
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