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Ball valves and long barrels

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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Ball valves and long barrels

Unread postAuthor: Pilgrimman » Sun Dec 23, 2007 7:38 pm

I have a 1 1/2" PVC ball valve for my HUGE golfball gun. The barrel is approximately 10-13 feet long. I chose the ball valve because of the massive flow. The only two valves I felt like doing were sprinkler or ball. Was I right to choose ball? I figure that the greater flow would give the air the ability to bunch up behind the golfball, as the barrel is so long. Am I right?

Thanks for the input! :D
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Unread postAuthor: cwazy1 » Sun Dec 23, 2007 7:50 pm

umm i still would have used the sprinkler.
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Unread postAuthor: bigbob12345 » Sun Dec 23, 2007 7:55 pm

Sprinkler probably would do a little better but the long barrel will help with the slow opening time
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Unread postAuthor: Thursto » Sun Dec 23, 2007 8:00 pm

Why not pneumaticly open the ball valve, with like a pneumatic ram or something?
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Unread postAuthor: MrCrowley » Sun Dec 23, 2007 8:41 pm

Yes you are correct, ball valve would be far better.

You should build a piston valve and get [Van Halen]the best of both worlds.[/Van Halen] :D
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Unread postAuthor: daberno123 » Sun Dec 23, 2007 9:56 pm

A 1.5" ball valve would be more powerful than, say, a 1.5" sprinkler for a 10' barrel because the ball valve has way better flow than the sprinkler. True, a sprinkler opens faster but with longer barrels that doesn't matter as much because it takes longer for the projectile to get out the barrel
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Unread postAuthor: frankrede » Sun Dec 23, 2007 11:08 pm

daberno123 wrote:A 1.5" ball valve would be more powerful than, say, a 1.5" sprinkler for a 10' barrel because the ball valve has way better flow than the sprinkler. True, a sprinkler opens faster but with longer barrels that doesn't matter as much because it takes longer for the projectile to get out the barrel
One would think.....but ball valves, especially pvc ones open far slower than the projectile moves, I doubt that your valve will be half open before the projectile has already exited the barrel.
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Unread postAuthor: daberno123 » Sun Dec 23, 2007 11:10 pm

a metal ball valve lubed up with a bunch of WD-40 opens pretty fast. So do pvc one with some WD-40 on them

EDIT: metal ones also just open up faster because their lever design is easier to turn than the pvc ones
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Unread postAuthor: Novacastrian » Sun Dec 23, 2007 11:13 pm

daberno123 wrote:a metal ball valve lubed up with a bunch of WD-40 opens pretty fast. So do pvc one with some WD-40 on them


True enough, BUT the projectile moves very very very very very very very very very fast. If the ball takes say even .25 of a second to open the ammo is already gone bye bye. Probably by about .1 of a second to exit.
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Unread postAuthor: clide » Mon Dec 24, 2007 1:25 am

I would suggest getting one of these:
http://cgi.ebay.com/Asco-2-way-High-Flo ... 0197691351

That thing would work great for a golf ball gun, and you can't beat that price. Just screw in a blowgun or some other valve to the top port for the trigger and you are ready to go with an extremely fast and high flow valve.
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Unread postAuthor: LikimysCrotchus5 » Mon Dec 24, 2007 1:51 am

I was thinking about getting that but im waiting on ShowNoMercy's results so that ill se if it actually works.

And if his results are good, im gonna probably get 2 :D
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Unread postAuthor: frankrede » Mon Dec 24, 2007 3:37 am

daberno123 wrote:a metal ball valve lubed up with a bunch of WD-40 opens pretty fast. So do pvc one with some WD-40 on them

EDIT: metal ones also just open up faster because their lever design is easier to turn than the pvc ones
They also open up faster because they are made better and pvc ones are crap.
btw. wd-40 just loves to eat away your seals
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Unread postAuthor: Pilgrimman » Tue Dec 25, 2007 1:18 am

@ Mr.Crowley I saw Van Halen in Portland, OR. They were unbelievable! Here's to hoping they go to NZ sometime!

Thanks for the help, everyone! clide, that valve is awesome, thanks for the link! I think I know what I'm going to do. Lube the valve with WD-40, and tape an old piece of pipe to the handle so I get more leverage when turning. Believe me, I'm happy with it as is, (3/4" of plywood doesn't have a prayer at 60 psi!) but I thought it'd be nice to get some feedback. Thanks guys! :D
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