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CO2 regulation with a ball 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 regulation with a ball valve.

Unread postAuthor: THEMOST » Mon Oct 16, 2006 7:26 pm

Would it work if I got a fancy metal ball valve and placed it between an air chamber and a CO2 tank and tried to slowly open it to regulate the amount of air that goes into chamber manually???????
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Unread postAuthor: tntlly » Mon Oct 16, 2006 7:38 pm

i have a one inch ball valve laying around and it says not more than 600 psi on it, and co2 is like 800....

also, before i even saw the rating i tried that and even if you have a good seal on the threads, the co2 finds a way out when you have the valve closed
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Unread postAuthor: Brian the brain » Tue Oct 17, 2006 3:41 am

If you have the material to withstand 900 psi you could make a meterpipe.
Open one ballvalve, fill a precalculated volume, close the ballvalve.Then open another ballvalve wich leads to the chamber.....

the concept is simple...finding the material however is not..
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Unread postAuthor: mark.f » Tue Oct 17, 2006 5:41 am

McMaster! They have all the stuff to make the thing you describe.

I would just need a welder and I'd be set.
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Unread postAuthor: KVINCEO » Tue Oct 17, 2006 11:56 am

if your useing a paintball co2 tank.. ball valves work. i think there might be a type of reg in the tanks valve tho. but dont attemp to reg it. just use a steel chamber. and because its at a higher psi, you can have a smaller chamber. i might be off, maybe paintball co2 tanks have a lesser psi than the big filler tanks. but i use em all the time on my cannons unregulated
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Unread postAuthor: THEMOST » Wed Oct 18, 2006 3:35 pm

If you dont regulate it wouldnt the thing soot with 800psi?? That's lethal with a paintball and I want to play with friends. I could understand it if there was a small air pressure tank (which you said), but my solenoid valve still couldnt handle over 140psi of wind blast. I think that that one idea of having a steel precalculated volume chamber with ball valves on bothsides would work.

Brian the brain, could you tell me what porportions I would need to fill a 1' long, 2"pvc pipe with 80 psi?? :P That would be freaking sweet if you could tell me that so I dont have to keep trying different sizes of iron pipe.
A 800-1000psi CO2 tank is waht Id use.
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Unread postAuthor: tntlly » Wed Oct 18, 2006 4:30 pm

co2 is cold, it makes pvc brittle. you can buy one foot sections of threaded metal pipe at home depot
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Unread postAuthor: THEMOST » Wed Oct 18, 2006 5:00 pm

...oooo...that's not good. How bad is the cooling effect? Could it withstand 100psi?
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Unread postAuthor: tntlly » Wed Oct 18, 2006 6:10 pm

i don't know, i haven't done co2 with pvc because all i've heard about it was bad, im sure you could get away with it a few times but each time your pvc would be more likely to blow. if you want co2 just do something like this.
<a href="http://biketiresdirect.com/productdetail.asp?p=GIMIC&tnum=3580582&c=4771333">here's a link to the bike tire inflators</a> you can buy them just about anywhere

edit: oops forgot the link to the post mentioned below <a href="http://www.spudfiles.com/forums/viewtopic.php?t=244"> here it is</a>
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Attachments
co2.jpg
these bike tire inflators use 16 gram co2 cartidges and you can control the amount of co2 that goes in with the twisting on/off knob so you don't need a whole cartridge for one shot if you have a small enough chamber. here's a post that explains the chamber volumes and amount of psi with 12 gram cartidges, i don't know how much it would be off with 16 grams.
co2.jpg (7.47 KiB) Viewed 1299 times
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Unread postAuthor: judgment_arms » Wed Oct 18, 2006 6:31 pm

Correct me if I’m wrong but, if you could fill bike tires would it not also be reasonable to assume that you could fill an air-cannon to a reasonable presure?
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Unread postAuthor: tntlly » Wed Oct 18, 2006 6:35 pm

yeah, but if you have a large chamber your 800 psi thats in the little cartridge expands a lot so it's not 800 psi anymore, the same idea as the way a big tank takes longer than a tiny one to fill to, let's say, 60 psi with a pump. the post about the barrel sizes expalins it as well
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Unread postAuthor: THEMOST » Wed Oct 18, 2006 8:13 pm

...this really sucks... I've got all the parts and there all measured out and metal pipe could not work with the barrel inside the chamber... :evil: :x :( Is it really that hard on the pvc? Do you know what the actual temperature is because I know that pvc is used outside in the winter for stuff...but its probably not pressurized then either is it... :cry:
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Unread postAuthor: CS » Wed Oct 18, 2006 8:26 pm

Im tired of seeing that f*cking face with the camera...

Anyway, as I understand it to be the reason a ball valve is not used in such system is there is a chance that the exiting gases when exiting will in some cases 'freeze' your valve open. Id condemn the procedure a bit risky.

Might look like <a href="http://www.cartoonstock.com/newscartoons/cartoonists/ena/lowres/enan10l.jpg">this</a> eh?
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Unread postAuthor: THEMOST » Wed Oct 18, 2006 8:33 pm

...dont CO2 tanks have flow regulators. I would think that having that would prevent freezing.

Get used to my face I was going to change it but ya know...I dont think I will now. :lol:
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Unread postAuthor: sv490665 » Thu Oct 19, 2006 7:59 pm

What i wanna know is what psi a typical paintball CO2 tank is charged to. I have a 9oz paintball tank and a 16oz paintball tank and i wanna know what pressure they're at on a fresh charge... anyone know?
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