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3 In. Piston Valve Launcher

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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3 In. Piston Valve Launcher

Unread postAuthor: acs2997 » Mon Dec 03, 2012 3:34 pm

This is my first piston valve gun. It has two 5 ft long air tanks, 3 in. diameter. The piston housing is 3 in. with a 2 in. barrel. Soon to come: golf ball barrel! I'll see if I can get some videos later.

The only issue I have with it is that sometimes my pilot release valve doesn't bring the piston back. I believe it's because it's either too small or too tight. I really don't know enough about them to tell. I've messed around with wrapping layers of tape around the back of the piston (ghetto, I know) for a tighter fit but it's too hard to tell exactly what the problem is. Maybe somebody could help? :)

Note: The broken cinder block is from me trying to pick it up. I made about one and a half steps until it basically crumbled. Luckily, none smashed my foot :D I know the video of the prior shot looks unimpressive, but one more psi and the thing wouldve been shattered






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Attachments
a1a1.jpg
from the back
b1b1.jpg
from the side
c1c1.jpg
my piston
d1d1.jpg
my bumper
e1e1.jpg
looking down the barrel
f1f1.jpg
my modified solenoid pilot exhaust valve
Last edited by jrrdw on Thu Oct 24, 2013 11:56 am, edited 9 times in total.
Reason: Fixed videos.

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Unread postAuthor: jackssmirkingrevenge » Mon Dec 03, 2012 4:04 pm

Nice first effort :) a ghetto piston like that needs a good pilot though, what are you using? A sprinkler valve would be an adequate solution.
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Unread postAuthor: acs2997 » Mon Dec 03, 2012 4:05 pm

yeah i'm using a sprinkler but for some reason it doesnt seem like it's opeing all the way. If i can get this darn video uploaded, maybe you could see. It almost whistles for a second or two before firing

There i posted the video
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 03, 2012 4:23 pm

The yellow coiled line is screwing you over by dramatically increasing the sprinkler pilot volume. You need to mount the sprinkler pilot on the valve itself.
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Unread postAuthor: acs2997 » Mon Dec 03, 2012 4:24 pm

alright, ill give it a try!
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Unread postAuthor: mattyzip77 » Mon Dec 03, 2012 10:24 pm

Nice gun too much pilot volume.... I would also try using a we've for a pilot..
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Unread postAuthor: acs2997 » Mon Dec 03, 2012 10:36 pm

A we've?

I'm uploading another video to youtube now of a better shot.
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 04, 2012 1:47 am

QEV autocorrect? :D
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Unread postAuthor: 8tonsemi » Tue Dec 04, 2012 2:32 pm

I personally wouldn't use this gun because of all the dwv on it, it's going to explode sooner or later. Nice job besides that just make sure to use NSF-pw fittings next time.
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Unread postAuthor: acs2997 » Tue Dec 04, 2012 6:43 pm

All the parts are pressure rated. I made sure. I bought and glued dwv elbows that weren't pressure rated so I had to throw them away. I double checked all parts after that. They're safe, I promise. I wouldn't use it otherwise.
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Unread postAuthor: mattyzip77 » Wed Dec 05, 2012 9:55 pm

Thank u jack!!! :D Listen to 8ton.. I wouldnt bring that thing past 40 or 50 psi or your going to get a piece of pvc embedded into you for sure due to the drain waste vent fittings..
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Unread postAuthor: acs2997 » Thu Dec 06, 2012 12:12 pm

None of them are dwv. My uncle's friend works in a lab that has access to pressure rated fittings that usually aren't. I'd show you pictures but my primer got all over where it says. The lowest rated part is the blowgun with a max of 90 psi
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Unread postAuthor: MrCrowley » Thu Dec 06, 2012 2:50 pm

The sockets look quite deep so I suspect acs2997 is correct and he is just using the DWV-style pressure rated fittings.

If it has NSF-PW on the fittings, they'll be pressure rated.
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Unread postAuthor: acs2997 » Thu Dec 06, 2012 6:28 pm

Trust me, I wouldn't be using it if my life was at risk.
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