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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: MrCrowley » Tue Jul 17, 2012 2:12 pm

Looking very nice! If you have a problem piloting the valve because of the restriction at the 1/4" male quick connect, you could try putting a half inch barrel nipple between the ball valve and quick connect which will give the pilot air a little room to expand before having its flow reduced by the quick connect. Probably wont be a problem, but it would just save you from adding a tee with another ball valve.
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Unread postAuthor: mattyzip77 » Tue Jul 17, 2012 3:47 pm

Dude you did a really good and clean job on this. Not to mention the gray pvc makes it look badass. I give it a 10.
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Unread postAuthor: airpress » Wed Jul 18, 2012 1:33 pm

First of all.
It works magnificent. The only problem that I have is the venting.
It doesn't vent enough to get the piston slide back.
I just unscrewed the bushing so I have a 1/2" porting.
I will put a piece of 1/2" pipe between the ballvalve an quick disconnect.
Thanks to Mr Crowley for mentioning. :)

Then it works great.
I only tested it with 2bars because it gives a massive bang on the steel reducer. I need to get a spring to put it behind the piston.

I made a little movie just dry firing. The sound in the video can not be compared with the "real sound".
The bang is much louder than in the video.

Here you go... :lol:

https://www.youtube.com/watch?v=KogtuOPv3V4

The video is poor quality.
Tomorrow I will make a better one. :)

I also made 2 supports out 1cm tick PVC.
I need to mount them in place but thats for thursday evening.
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Unread postAuthor: mattyzip77 » Wed Jul 18, 2012 1:44 pm

Your pilot valve probably isnt doing the job. You should get a small qev to pilot it. Very nice though. I actually want to make one now!!!! It may also start to slide back when you add more pressure. I had the same problem with my first barrel sealer.
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Unread postAuthor: airpress » Fri Jul 20, 2012 12:32 pm

I just discovered that the 75mm pvc pipe that i have laying around. I bought a pipe of 5m 75mm.
So a have 4m 75mm pvc pipe left.

Inside the 75mm pipe a tennisball has a perfect fit! :P
I have cutted a 1,20m 75mm pipe for a tennisball barrel. :)
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Unread postAuthor: airpress » Sat Jul 28, 2012 7:12 am

Image

Tennisball flies 100m with 5,5bar pressure. If you listen good you can hear a echo. :P

More info later in Finished Cannons.

Btw: i've ordered all the needed fitting for a 3" T piston. :)
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 28, 2012 9:55 am

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Otherwise, not bad :)
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Unread postAuthor: airpress » Sat Jul 28, 2012 10:29 am

Tomorrow I will make a better one, with the correct holding off the iphone.
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Unread postAuthor: airpress » Fri Aug 10, 2012 7:37 am

I'm currently making a 3" inch version off this!
The piston seat is 2".

And the fittings are much larger than the 2". :p
It also much heavier than the 2" model.
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Last edited by airpress on Sat Aug 18, 2012 10:40 am, edited 1 time in total.
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Unread postAuthor: MrCrowley » Fri Aug 10, 2012 9:12 am

Goddamn, that's frickin' massive. Still keeping the 3" version a pneumatic?
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Unread postAuthor: mattyzip77 » Fri Aug 10, 2012 1:02 pm

Nice that thing has some serious girth!!!!! Hope your making it all metal/steel. 8) 8)
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Unread postAuthor: Mr.Tallahassee » Fri Aug 10, 2012 1:43 pm

That thing is scary. :shock: It would be extremely heavy but make the chamber steel and mount it on a cart. Then you could take it to much higher pressure than 3'' PVC could stand. Definitely keep us posted on this monster!
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Unread postAuthor: silentkill12345 » Fri Aug 10, 2012 3:14 pm

nicly done :D (you almost need a crane to till your 3' version :p lol that must have some serious power dude! keep us up to date!
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Unread postAuthor: ramses » Fri Aug 10, 2012 10:51 pm

where did you find 3" fittings?
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Unread postAuthor: airpress » Sat Aug 11, 2012 2:38 am

Thanx for all the replys. :)
Ofcourse I will keep updated this one.

MrCrowley: Yes, a pneumatic one.

mattyzip77: I don't know yet. I looked for 3" steel pipe. It's 36€ for 1m. And the stupid thing of all, I can only buy it in lengths of 6m. :shock:

ramses: Since I couldn't find it in Belgium stores. I ordered it from the Netherlands online. I payed 19€ for a 3" tee. The other fittings where way below 19€.

Here 2 pics.

Image
the piston will be around 76mm in diameter

Image
3" nipple mounted in the T
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Last edited by airpress on Sat Aug 18, 2012 10:42 am, edited 1 time in total.
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