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Under Barrel 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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Under Barrel Shotgun

Unread postAuthor: 1313 » Tue Mar 06, 2007 6:52 pm

I am in the process of finishing my primary pneumatic rifle. Underneath the gun i have an ideal place to put a short shotgun. All I plan to to is use a simple ball valve setup with 3/4" pvc as the tank, 1/2" as the barrel and load with shot. My main rifle uses a piston valve and I love it.. but its simply too big to try to replicate on a the shotgun. Is there any other type of valve with higher flow I would use in place of the ball valve? A solenoid is also too big for what i have room for. Any suggestions wlecomed.
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Unread postAuthor: Hotwired » Tue Mar 06, 2007 7:00 pm

Theres not much to choose from really.

If you're after a valve thats smaller than a piston valve on a rifle design you're looking at diaphragm valves.

You could try to use a 1/2" QEV but its pretty much the same size and shape as a piston valve of the same porting.
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Last edited by Hotwired on Tue Mar 06, 2007 7:01 pm, edited 1 time in total.
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Unread postAuthor: Pete Zaria » Tue Mar 06, 2007 7:01 pm

Welcome to the forums.

My only ideas would be a pneumatically modified 3/4" sprinkler, or a 3/4" QEV (this would be best and have the best performance of your available options).

I'd also suggest connecting the "shotgun" pressure chamber to the main gun's pressure chamber via air compressor hose and a ball valve. This way you can pressurize them both at the same time via one quickconnect/schrader, and then close the ball valve to separate the chambers.

Peace,
Pete Zaria.
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Unread postAuthor: judgment_arms » Tue Mar 06, 2007 7:10 pm

Under barrel scattergun…sound familiar…
Anyway,
dang, that small, what caliber’s your main barrel? You may want to go coaxial.
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Call me "Judge", it's easier to type.

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Unread postAuthor: noname » Tue Mar 06, 2007 8:49 pm

Yeah, I'd say a small coaxial. Even a 2" coupler as a chamber with a diaphragm valve is enough to shoot a load of BBs 80 ft.
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