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? About 1.5" valve for 3" barrel

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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? About 1.5" valve for 3" barrel

Unread postAuthor: Atattack » Sat Oct 29, 2011 4:15 am

Would a 1.5" dust collector diaphragm valve be to small for a 3" barrel? I am assuming will be fine wanted to see if anyone has any first hand experience with this set up. Thanks.
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Unread postAuthor: Crna Legija » Sat Oct 29, 2011 4:47 am

what do you want to shoot out of the barrel for light ammo is should be fine.
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Unread postAuthor: Labtecpower » Sat Oct 29, 2011 4:49 am

I think the power will be very disappointing....
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Unread postAuthor: MrCrowley » Sat Oct 29, 2011 4:57 am

Only thing I can think of shooting with a 3" barrel or similar would be soda canons (2.5" barrel, I know) or canned food (which apparently fit 3" barrels) and either of those choices would perform poorly with a 1.5" valve.

To put it in perspective, I get about 70m/s with a soda can using a 2" sprinkler valve at 100PSI with a modest chamber.
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Unread postAuthor: mattyzip77 » Sat Oct 29, 2011 10:59 am

There is a 2 inch valve on ebay. Its also a dust collector. I was going to get one, but I have about 10 valves already I need to make cannons for. This will give better performance than the 1 1/2, but how much better, I do not know. Why do you want such a big barrel??? Anyhow, the link is below.


http://www.ebay.com/itm/MECAIR-DUST-COL ... 760wt_1139
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Unread postAuthor: Technician1002 » Sat Oct 29, 2011 11:54 am

In testing various size barrels on my 2 inch valve cannon, 3 inch barrel will work, but with limited power. On a 2 inch valve the best power is with a 2.5 to 3 inch barrel. The 4 inch on a 2 inch valve which would be the equivalent of 3 inch on a 1.5 inch valve shows significant power loss. A lower valve CV than mine would make matters worse.
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