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discuss valves

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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discuss valves

Unread postAuthor: SpudFarm » Thu May 01, 2008 6:13 pm

after i saw this thread i got this idea.

why not have a thread talking about all the different valves used today? and how to improve them..

questions also goes here.
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Last edited by SpudFarm on Thu May 01, 2008 6:18 pm, edited 1 time in total.
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Unread postAuthor: elitesniper » Thu May 01, 2008 6:15 pm

I got an error :roll:
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Unread postAuthor: SpudFarm » Thu May 01, 2008 6:19 pm

fixed
(MeToSh)
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Unread postAuthor: jrrdw » Thu May 01, 2008 6:28 pm

I built mine in a cross, I'm one of only a few to do so! :P
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Unread postAuthor: SpudFarm » Thu May 01, 2008 6:31 pm

please post some details
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Unread postAuthor: bigbob12345 » Thu May 01, 2008 6:32 pm

Im just wondering if anyone has ever made a gun with duel piston valves?(not mauler or supah)
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Unread postAuthor: OuchProgramme » Thu May 01, 2008 6:42 pm

bigbob12345 wrote:Im just wondering if anyone has ever made a gun with duel piston valves?(not mauler or supah)


I've seen one, both pistons are activated by sprinkler valves, which are activated by a single blowgun.
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Unread postAuthor: SpudFarm » Thu May 01, 2008 6:43 pm

bigbob12345 wrote:Im just wondering if anyone has ever made a gun with duel piston valves?(not mauler or supah)


i have thought of it..
since: if i use four 1/2" valves i can use a 2" barrel :P
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Unread postAuthor: Velocity » Thu May 01, 2008 6:48 pm

spudfarm wrote:
bigbob12345 wrote:Im just wondering if anyone has ever made a gun with duel piston valves?(not mauler or supah)


i have thought of it..
since: if i use four 1/2" valves i can use a 2" barrel :P


You would need sixteen 1/2" valves to equal the flow of a 2" barrel. And even then, interior restrictions would cause you to need more than sixteen valves.
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Unread postAuthor: SpudFarm » Thu May 01, 2008 6:52 pm

hmm ohh i guess that has something to do with the "D/4 rule"
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Unread postAuthor: bigbob12345 » Thu May 01, 2008 7:07 pm

ouchprogramme: got a link

spudfarm: it has nothing to do with the d/4 rule its just that 2in pipe lets that much more flow through
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Unread postAuthor: DYI » Thu May 01, 2008 7:11 pm

Well, 2" pipe would have 4 times the diameter, and therefore 16 times the flow of 1/2" pipe, because area of a circle increases as a square of radius.
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Unread postAuthor: bigbob12345 » Thu May 01, 2008 7:13 pm

Yeah
think about it in the way that if you stick 4 peices of 1/2in pipe in 2in pipe there will still be a lot of room left
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Unread postAuthor: MrCrowley » Thu May 01, 2008 7:59 pm

I always wanted to make a topic about the *<A HREF="http://www.youtube.com/watch?v=FJGkKdqPx_c">Movie Trailer Voice</a>* 'World's Most Amazing Piston Valves', like pistons constructed with strange materials.

For example, I made a piston out of two 9mm shell casings :D
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Unread postAuthor: DonTheLegend » Thu May 01, 2008 8:54 pm

bigbob12345 wrote:
Im just wondering if anyone has ever made a gun with duel piston valves?(not mauler or supah)


Yea, I built one with LynyrdSkynyrd. Basically very close to joel's Mega Launcher in configuration. Valves were 4" tees with three inch porting, triggered by an electronic 3/4" sprinkler. They were chamber sealers. Dual 6" x 48" chambers.

It was a beast. We shot a tennis ball filled with gravel well over a quarter of a mile. We did a dryfire at 40 psi with no barrel and when the air wave hit my neighbor's car about 100 feet away, it sounded like someone had just hit it with a basketball. Scared the crap out of us. Kicked like a mule too.

The only problem was the tee's weren't pressure rated and we had one blow up. We were lucky someone wasn't hurt. Working on new valves now that are pressure rated :)
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