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2" T Piston Valve

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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Unread postAuthor: silentkill12345 » Wed Aug 15, 2012 5:42 am

nice :) post a vid!
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Unread postAuthor: airpress » Wed Aug 15, 2012 6:27 am

First opinion.

The 3/4" ballvalve is not enough to vent the piston in one time. The piston slides back when I open the pilotvalve, but a little bit to slowly.
I will try a 1" one tomorrow.
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Unread postAuthor: silentkill12345 » Wed Aug 15, 2012 6:34 am

think that would make a small diference, try somthing bigger mayby?
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Unread postAuthor: airpress » Wed Aug 15, 2012 6:38 am

I'm very sure it will work. I know from my first 2" piston valve I maked few weeks ago. I was pressurizing the cannon through a 1/4" quick disconnect fitting. I released the compressor hose, and was ready to fire. Keep in mind that the 1/4" quickdisconnect fitting was still connected in the ball valve. When I openend the valve nothing happened, the air from the chamber was escaping through the quick disconnect fitting. When i unscrewed the fitting so that I have a 1/2" opening it worked greatly! The piston slided back with a big bang.

Hopely it will be the same with this one! :)
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Unread postAuthor: airpress » Thu Aug 16, 2012 9:07 am

Good news!!

I found a dealer that will make me a 1m 3" pipe.
Tomorrow I can get it! Tomorrow more news about the changed pilot ballvalve an STEEL chamber. I can take it to higher pressure than pvc. :twisted:

I've changed the pilot area. I've disconnected the T and manometer. I will place the manometer in the 3" elbow through the pipe. That will make the pilotvolume smaller than before. I just have now a 3" to 2" reducer, bushinged(lol) down to a 1" ballvalve.
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Last edited by airpress on Thu Aug 16, 2012 12:10 pm, edited 1 time in total.
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Unread postAuthor: silentkill12345 » Thu Aug 16, 2012 11:18 am

cool :) keep us updated!
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Unread postAuthor: airpress » Fri Aug 17, 2012 9:13 am

the pipe and 3" endcap

Image

Endcap screwed on the pipe, the threads are a little bit to long in comparision with the thread from the encap.
Image

5/4" pilot valve
Image

I'm thinking about using a pneumatic cylinder to open the ball valve. Should this be possible?
Also something else. Can I pressurize the chamber not behind the piston?
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Last edited by airpress on Wed Dec 26, 2012 8:58 am, edited 2 times in total.
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Unread postAuthor: pneumaticcannons » Fri Aug 17, 2012 9:53 am

Yes, but it would make a lot more sense if you just spring load it. Or use a qev+ blowgun combo
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Unread postAuthor: airpress » Fri Aug 17, 2012 2:14 pm

Good news!

The piston works perfect with the valve upgrade!
More info tomorrow.
Here a few pics with everything mounted except the barrel and pressure gauge.

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Last edited by airpress on Sat Aug 18, 2012 10:35 am, edited 2 times in total.
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Unread postAuthor: mattyzip77 » Fri Aug 17, 2012 3:22 pm

I got 2 words, fukking awesome!!!
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Unread postAuthor: airpress » Fri Aug 17, 2012 3:59 pm

Thanx.

And I love the sounds two times more then the 2" version.
The sound when the air escapes when the piston slides back is fantastic. :twisted:

I calculated something.
When I pressurize the launcher with 4bars. The force on the piston is 176N.
Unbelievable what a little bit air can do when its compressed. :p
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 17, 2012 4:19 pm

Nice... this needs to be taken to higher pressures ;)
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Unread postAuthor: MrCrowley » Fri Aug 17, 2012 5:02 pm

Goddamn, how heavy is that thing?
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Unread postAuthor: airpress » Fri Aug 17, 2012 5:05 pm

very heavy :p, the pipe alone is something like 15kilo
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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 5:11 pm

This has to be the cannon of all cannons, I haven't seen anything bigger on all of Spudfiles! THIS CANNON IS EPIC! I can't wait to see damage pics!!!
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