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Sprinkler Valve size

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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Sprinkler Valve size

Unread postAuthor: Sean » Sun Jul 06, 2008 8:17 pm

I plan on making my first pneumatic gun and have a question about the size of the valve. I want to have a 3/4 inch barrel to shoot paintballs that's 24-30 inches long and a 12 inch chamber that's 3 inches in diameter. I bought a jar-top 3/4" sprinkler valve but am wondering.. Should I return it and go buy a 1"? Also, do you think my size for the chamber is ok? thanks for your answers, I really like spudfiles :D
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Unread postAuthor: SEAKING9006 » Sun Jul 06, 2008 8:18 pm

It should be fine.
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Unread postAuthor: jr » Sun Jul 06, 2008 8:24 pm

The barrel and valve match perfectly, if the valve is to big it could over power the barrel. The only advantage I see is if you want to use the valve on a later cannon but at that point you would probably just buy another valve.

with a pnue. you want to be between a 1:1 and a 4:1 C:B. But I'm sure you know that from all your research! :lol:
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Unread postAuthor: Sean » Sun Jul 06, 2008 8:36 pm

jr wrote:with a pnue. you want to be between a 1:1 and a 4:1 C:B. But I'm sure you know that from all your research! :lol:


Yes I remember something about that statement. I've taken others people advice and read a lot of the spud wiki.. From other questions I've seen, I can tell others do not :(

Thanks for your responses :D
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Unread postAuthor: jr » Sun Jul 06, 2008 9:20 pm

Be sure to post it in the pneumatic cannon showcase when you get it completed! 8)
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Unread postAuthor: pizlo » Sun Jul 06, 2008 9:33 pm

There is an advantage that noone said,
Your barrel is the ultimate constriction of air. So theoretically a valve with an opening larger than the barrel adds no extra flow. While no extra flow is added, a 1 inch valve will be open to 3/4 of an inch faster than the 3/4 inch, this will increase performance (a little). I think the real advantage of a 1 inch is the use on later guns, an the ability to put a 1 or 1.25 inch barrel on it.
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Unread postAuthor: MrCrowley » Mon Jul 07, 2008 1:01 am

Your chamber is pretty over kill. You will get better results and efficiency with a foot long 2" chamber and a 1" sprinkler valve. If you can return, I would recommend doing so. You should notice a increase in the power.
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Unread postAuthor: Sean » Mon Jul 07, 2008 1:11 am

yeah I was looking at the ratio numbers and they just didn't look right.. I was actually thinking the same exact thing about the 2 inch. i was just thinking 3 inch because i already had some but buying some 2 inch wouldn't hurt, thank again everybody
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Unread postAuthor: MrCrowley » Mon Jul 07, 2008 1:14 am

Well you could always use the 3" for another cannon.
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Unread postAuthor: Sean » Mon Jul 07, 2008 9:40 pm

Hmm I think I'm going to keep the 3/4 inch valve and use the 2 inch chamber instead. If I'm correct, with a 24 inch long 3/4 barrel, 2 inch 12 inch long chamber it makes it 3.56:1 ratio but with a 30 inch barrel it makes a 2.85:1 ratio. Would there be a significant difference if I used one over the other?
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Unread postAuthor: pizlo » Mon Jul 07, 2008 9:50 pm

30 inch barrel would give you better performance for sure.
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