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How to make a QEV?

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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How to make a QEV?

Unread postAuthor: DragonAllianace » Tue Oct 16, 2012 6:20 pm

Hi guys

So since where i live its basically impossible to buy a QEV (Or atleast find someone who sells them) i think i will need to make one or find a other way to make my Soon to be bolt action rifle able to get multiple shots out of a co2 12 gram Cartridge
So if anyone know how to make a QEV i would appreciate it. BTW how much PSI is on a 12 gram co2 cartridge at room temp?
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Unread postAuthor: jsefcik » Tue Oct 16, 2012 9:22 pm

mcmaster or ebay dude

they are all over the place :D :D
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Unread postAuthor: Mr.Tallahassee » Tue Oct 16, 2012 10:31 pm

I would use google for questions like the pressure in a CO2 cartridge. I'll answer anyway. The pressure in a CO2 cartridge at room temp. (70F 20C) is about 800 PSI. If you take the volume of gas in a 12 gram cart. and multiply it by 4, that's the volume required to drop the gas pressure to 200 PSI. That's the volume of gas, not the internal volume of the metal cartridge itself. Unless you use metal pipe, you won't be able to use the internal pressure without regulating it to a lower pressure.
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 16, 2012 11:14 pm

http://www.ebay.com/itm/XQ170600-G1-4-F ... 4abcf97183

They ship to Peru, I don't get why you can't buy one. Too young to have a credit card and parents don't want to fund your projectile launching device?

Also, you don't have to use a QEV for small calibres:

http://www.spudfiles.com/forums/6mm-mag ... 21684.html


Blowgun, fittings and o-rings and you're sorted.

As to CO<sub>2</sub> capsules, read up: http://www.privatedata.com/doomlabs/sci ... ience.html

If you still want to make a QEV type unit, look at this - I made it with pieces of tube, masking tape and Araldite and it was good to 850 psi at least:

http://www.spudfiles.com/forums/mini-0- ... 20101.html
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