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QDV Paintball Shotgun

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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QDV Paintball Shotgun

Unread postAuthor: HotSpark » Wed Dec 30, 2009 3:37 am

I want to make a underbarrel paintball shotgun. The basic parts will be a bernzomatic propane or mapp gas cylinder and a 3/4" nipple.
Image
I will use a solidly attached rod to the valve to save space.
Just a few things I haven't been able to find out by searching.
#The valve ports are there any guidelines I need to follow other than use cutouts and not two pieces?
#What Should I use for a buffer? I'll be using a HDPE valve.
#Will I have to worry about the paintballs dislodging the valve or sudden movements doing the same?
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 30, 2009 5:30 am

In this case, what's the advantage of using a QDV over a conventional piston valve with a blowgun pilot?
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Unread postAuthor: HotSpark » Wed Dec 30, 2009 6:17 am

I'm not quite sure but I've never had any luck with pistons.
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Unread postAuthor: psycix » Wed Dec 30, 2009 6:44 am

So a simple face seal is harder to do then two o-ring seals?!
We can help you with your piston valve development.

That rod attached to the piston is scary. It will smack back with a lot of force.

Paintballs will probably break when loaded like that. You'll fire liquid paint.

#Will I have to worry about the paintballs dislodging the valve or sudden movements doing the same?

That depends on the friction of the piston.
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 30, 2009 6:58 am

psycix wrote:So a simple face seal is harder to do then two o-ring seals?!
We can help you with your piston valve development.


Pretty much what I was thinking.
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