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Sprinkler Valve GPM- air?

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 GPM- air?

Unread postAuthor: PVC Arsenal 17 » Wed Oct 03, 2007 8:23 pm

I'm looking to buy a 2" sprinkler valve for a tennis ball cannon. The one I found has a flow rating of 120 gpm. What would that translate to in air? Would the same amount of air flow through the valve as a liquid would, or more because air can be compressed?

Also- would that rating be enough to send a tennis ball a couple hundred yards? I need someone handy with GGDT since I can't get it to work.

Edit: Another question. The valve I'm looking at has a second inlet port so it can be mounted on an angle as well as inline. If I connected both input ports to my air chamber, would the valve be more efficient? Theorectically I would assume that there would be less restriction with 2 input ports.

Thanks...
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Last edited by PVC Arsenal 17 on Wed Oct 03, 2007 8:27 pm, edited 1 time in total.

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Unread postAuthor: CannonCreator » Wed Oct 03, 2007 8:25 pm

More info please. Like cannon chamber size, and how much PSI you plan filling it to.
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Unread postAuthor: PVC Arsenal 17 » Wed Oct 03, 2007 8:28 pm

Please excuse my laziness here- 3 feet of 4" sch40 PVC as the chamber pressurized to 60 psi.
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Unread postAuthor: spudgunnerwryyyyy » Wed Oct 03, 2007 8:34 pm

Well considering a regular 1" sprinkler valve runs about 25gpm at 80 psi. You are looking at some serious flow. That thing is going to kick ass looking forward to a working gun with it. Well one fact to consider, pressure drop in water is a horrible thing since water can't be compressed but in a compressed gas pressure drop isn't as much of an issue so this means that any info about pressure drop on the spec sheet could be ignored.
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Unread postAuthor: CannonCreator » Wed Oct 03, 2007 8:53 pm

Also- would that rating be enough to send a tennis ball a couple hundred yards? I need someone handy with GGDT since I can't get it to work.


For sure with that size of a chamber and 60 psi should for sure can get you a couple hundred yards easily. If you were to fill to 100psi There would be absolutly no doubt about a couple hundread yards, if your shooting mortar style.

Please excuse my laziness


No problem I seem to forget to post that info a lot

Edit: Another question. The valve I'm looking at has a second inlet port so it can be mounted on an angle as well as inline. If I connected both input ports to my air chamber, would the valve be more efficient? Theorectically I would assume that there would be less restriction with 2 input ports.



And. Ya I think what you said about reducing restriction would be correct, and it would probably be a good idea to use both of them.

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Unread postAuthor: PVC Arsenal 17 » Thu Oct 04, 2007 2:48 pm

Here is said valve: http://www.sprinklerwarehouse.com/217B- ... p/217b.htm

Not too expensive...
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Unread postAuthor: Spudnik Tweaker » Thu Oct 04, 2007 3:41 pm

PVC Arsenal 17 wrote:Here is said valve: http://www.sprinklerwarehouse.com/217B- ... p/217b.htm

Not too expensive...
Wow ... you are willing to pay $65.98 for a plastic
sprinkler valve? Have you considered designing a more effective, yet cheaper piston valve?
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Unread postAuthor: PVC Arsenal 17 » Thu Oct 04, 2007 4:05 pm

No way...

hehehe
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