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Semi Auto Piston Valve Paintball Gun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Semi Auto Piston Valve Paintball Gun

Unread postAuthor: 1nxtmonster » Mon Nov 25, 2013 6:06 pm

Finally finished this project. Semi Auto piston valve paintball gun made from PVC. Some specs:

Air source: regulated 70 PSI 5 gallon air tank

Piston: Plastic tube with neoprene sealing face

Barrel: 3/4 inch CPVC pipe

Magazine: 13 round magazine with simple tab detents



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1nxtmonster
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Re: Semi Auto Piston Valve Paintball Gun

Unread postAuthor: tigerblues28 » Mon Nov 25, 2013 11:11 pm

This thing is sick! I'm assuming its just a QEV kinda deal here? Ill have to check out your previous post. Looks sweet though. Just extremely careful in the cold with the pvc pipes.

Nick
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Re: Semi Auto Piston Valve Paintball Gun

Unread postAuthor: 1nxtmonster » Tue Nov 26, 2013 7:23 am

Thanks! Yep, just a QEV with regulator for multiple shots. I can get about 30-40 shots off at 65 PSI if I fill the tank to 100.
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Re: Semi Auto Piston Valve Paintball Gun

Unread postAuthor: oli12345678910 » Sun Dec 08, 2013 6:57 am

Could you please explain to me how you made your piston valve and how iit works thanks :)
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Re: Semi Auto Piston Valve Paintball Gun

Unread postAuthor: 1nxtmonster » Sun Dec 08, 2013 2:46 pm

My piston valve is made out of a piece of plastic pipe, plugged with epoxy and with a rubber sealing face on the front. The plastic pipe was milled to fit just inside of the area it sits in. For an explanation on piston valves, see this thread:

pneumatic-cannons/topic8157.html
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Re: Semi Auto Piston Valve Paintball Gun

Unread postAuthor: Maasoon » Mon Dec 09, 2013 4:38 am

hey how does the regulator setup work and is the piston valve like a qev but shuts faster? how is the feeder setup? sick gun tho looks real fun
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Re: Semi Auto Piston Valve Paintball Gun

Unread postAuthor: 1nxtmonster » Mon Dec 09, 2013 8:11 am

So the regulator setup is that the gun works best at a certain pressure (in this case 70 PSI, any higher and the paintballs will explode). I can fill the air tank to a pressure higher than 70 PSI, say 100 psi, then use a regulator to give the gun only 70 PSI.

It is a gravity fed hopper with detents (small tabs that keep the paintball from rolling out the barrel until fired)
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Re: Semi Auto Piston Valve Paintball Gun

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