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How to build a 2 inch barrel sealing 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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How to build a 2 inch barrel sealing piston valve?

Unread postAuthor: BeaverRat » Thu May 27, 2010 11:45 pm

Hello,
my next build will be based around a 2 inch tee barrel sealing piston valve. I will be using a 2.5 inch chamber and a 1.5 inch barrel (about 5 feet long). What parts do I need to build this and how do I build it? Is there a tutorial somewhere? This will be a big improvement to my sprinkler valve!
Thanks
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Unread postAuthor: Hubb » Fri May 28, 2010 12:03 am

The Hubb Library has a how to on building a 2" piston.
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Unread postAuthor: Technician1002 » Fri May 28, 2010 12:20 am

The Wiki has a section on Piston valves. You may wish to study the different ratios so you can get both performance and reliability. Higher performance pistons tend to be temperamental and difficult to get to work correctly.

http://www.spudfiles.com/spud_wiki/index.php?title=Piston_valve
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Unread postAuthor: jor2daje » Fri May 28, 2010 12:27 am

Hubb has a great how to you should check out but Ill throw my little diagram up also.
http://i715.photobucket.com/albums/ww152/jor2daje/mypistonvalve.jpg?t=1275024415
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Unread postAuthor: BeaverRat » Fri May 28, 2010 12:49 am

Thanks guys so much! I feel very confident I can build this now! How big of an improvement will I see over just a 1" sprinkler valve?
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Unread postAuthor: deathbyDWV » Fri May 28, 2010 12:55 am

Alot of improvement. Anywhere from 2x to 5x most likely... Instead of a "sha-woomp" you'll get more of a "POW"...
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Unread postAuthor: Technician1002 » Fri May 28, 2010 12:00 pm

For comparison, how well does a 1 inch sprinkler valve hold up to a 2 inch piston? Here is the launch of a full soda can. A 1 inch sprinkler valve may get it out of the muzzle but would not have nearly the energy of this launch. I agree that it does go pow with the larger valve. :D
[youtube]http://www.youtube.com/watch?v=0MzvW1Fy34E[/youtube]
This is a 3 gallon chamber and a 2 inch valve.

A 2 inch piston valve is in a different class than a 1 inch sprinkler valve.

I don't think I could have made this hole in a carpet with a T Shirt using a 1 inch sprinkler valve.
Image
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Last edited by Technician1002 on Fri May 28, 2010 5:19 pm, edited 1 time in total.
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Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 2:41 pm

Heres a tutorial, in the future you may want to check the how to section
http://www.instructables.com/id/Golfbal ... That-Shoo/
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