Sprinkler Valve GPM- air?

[PVC Arsenal 17]

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...

[CannonCreator]

More info please. Like cannon chamber size, and how much PSI you plan filling it to.

[PVC Arsenal 17]

Please excuse my laziness here- 3 feet of 4" sch40 PVC as the chamber pressurized to 60 psi.

[spudgunnerwryyyyy]

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.

[CannonCreator]

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.

-Cannon Creator

[PVC Arsenal 17]

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

Not too expensive...

[Spudnik Tweaker]

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?

[PVC Arsenal 17]

No way...

hehehe