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Now Which Valve To Choose

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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Now Which Valve To Choose

Unread postAuthor: n-strike » Sun Jun 29, 2008 10:28 pm

Hey, I plan on making a pneumatic tennis ball launcher, but there's only one problem...There's no 2 1/2" PVC pipe. There's only 2 1/2" ABS pipe, and 2 1/2" electrical conduit (the grey stuff). I know this is not a good idea, and I know people will quote this sentence and say "Well if you know it's not a good idea, then why are you asking us?" and the answer is that I don't feel like going to The States and because this is my last big project for now, because my dad said my cannons are getting too big, and too expensive, even if I'm paying for them...So please help. Thanks!
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Last edited by n-strike on Mon Jun 30, 2008 4:52 am, edited 1 time in total.
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Unread postAuthor: SpudFarm » Sun Jun 29, 2008 10:30 pm

cell core or solid wall ABS
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Unread postAuthor: SEAKING9006 » Sun Jun 29, 2008 10:31 pm

Actually, it's fine. As long as it's not too brittle or fragile, the pressure shouldn't affect it...


Unless you're using it for the tanks. :?
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Unread postAuthor: LikimysCrotchus5 » Sun Jun 29, 2008 10:31 pm

If its a barrel, theres no problem with it being ABS, just make sure the tennis ball fits, and use ABS to PVC transition glue and that it.


Dont stop making cannons, keep em' comin!
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Unread postAuthor: n-strike » Sun Jun 29, 2008 11:00 pm

Thanks guys, and thanks for replying so fast. Especially Crotch because he's always one of the first people to reply in my threads. =) And do you know where I can find this "ABS to PVC transition glue"?
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Unread postAuthor: LikimysCrotchus5 » Sun Jun 29, 2008 11:01 pm

Should be at your local hardware store, or homedepot or lowes.

Sure, ill respond anytime. :)

Look whos back, replying fast again :D
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Unread postAuthor: n-strike » Mon Jun 30, 2008 12:10 am

Thanks again, Crotch! Sorry, I was just watching the best show ever. (CelebraCadabra)
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Unread postAuthor: daxspudder » Mon Jun 30, 2008 12:13 am

or just put pvc to abs threads on it...
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Unread postAuthor: n-strike » Mon Jun 30, 2008 12:14 am

Thanks for another suggestion...

So now I have another problem...I don't know which valve to pick, because sprinkler valves and ball valves would be too small for a 2 1/2" barrel, and if I make a piston valve, it would be my first time using it, and I don't want to mess it up. Thanks.
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Unread postAuthor: psycix » Mon Jun 30, 2008 4:41 pm

Well, the one and only solution to bigger bores are piston valves, ofcourse!
Or use burst disks.... though not really worth the hassle I think.
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Unread postAuthor: vovka351 » Mon Jun 30, 2008 5:13 pm

ummm... two inch ball valve, like my friend did?
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Unread postAuthor: n-strike » Mon Jun 30, 2008 5:17 pm

They don't sell 2" ball valves here, only in the Home Depot that I checked in The States before when I went there, and it's too hard to open...even with petroleum jelly, and a handle attatched to it. It's also too big, AND I'd have to find a 2 1/2"-2" bushing. =|
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Unread postAuthor: psycix » Tue Jul 01, 2008 5:42 am

A 2" BV won't yield alot of power.
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Unread postAuthor: SpudFarm » Tue Jul 01, 2008 5:46 am

burst disk clamped in a 2-1/2" cam lock
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Unread postAuthor: MrCrowley » Tue Jul 01, 2008 6:17 am

n-strike wrote:Thanks for another suggestion...

So now I have another problem...I don't know which valve to pick, because sprinkler valves and ball valves would be too small for a 2 1/2" barrel, and if I make a piston valve, it would be my first time using it, and I don't want to mess it up. Thanks.

This may help:
http://www.instructables.com/id/Golfbal ... That-Shoo/

2" piston would be more then enough.
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