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2" Piston valve 1.5" porting

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: jhalek90 » Tue May 04, 2010 5:03 pm

Pool noodle in a 3'' porting coaxial valve was a terrible bumper.

It gets stuck in the sprinkler valve... which is 1 in EVERY single shot.

A good bumper could be made from a coil or garden hose with slits cut in it to allow it to "Crush" easier. It should resemble a garden hose compression spring. lol
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POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 5:06 pm

Hubb said he cracked the tee with only aquarium hose for his bumper with this piston, I had a piston kinda like this and use a big spring for the bumper, it helped it seal and made a great bumper
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Last edited by clemsonguy1125 on Tue May 04, 2010 5:15 pm, edited 9 times in total.
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Unread postAuthor: Gun Freak » Tue May 04, 2010 5:07 pm

Ok Well I'm gonna run over and get that hose... if it's still there.

edit: nope it was gone, but i have some spare in the back yard.

hubb said with the hose his still sracked like clemsonguy stated
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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 6:59 pm

If the hose does not work well enough, I saw a gun somewhere that use half of a nerf ball glued at the back of the piston, this worked good enough on a 3 inch piston
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Unread postAuthor: jor2daje » Tue May 04, 2010 7:06 pm

I used the bumper from the corners of shopping carts the make the piston in my 2" valve.

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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 8:00 pm

How did you get the bumper though
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Unread postAuthor: Gun Freak » Tue May 04, 2010 8:03 pm

I'm just leaving the foam thing in and i'll test it t 30 psi... you thing that will hold up at 30? and jor2daje how's you get that lol. I've seen it before in random cannon. the hose was gone when i went to get it but i have some spare in the back yard, I used it to reinforce the bumper. i stuck a little piece down to the middle of my bumper to open the hole up a little more. but i'll keep my eye out for things
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Unread postAuthor: clemsonguy1125 » Tue May 04, 2010 8:06 pm

I've shot mine at 30 psi with no bumper and I didy break anything, don't try that because my piston was light but it stll
needed a bumper
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Unread postAuthor: Gun Freak » Tue May 04, 2010 8:11 pm

yeah i'm not doing anythings dumb, i can't afford to break it.
i'll post it in the showcase tomorrow after i test it then add updates when i get the bumper and up the pressure
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Unread postAuthor: Marffy » Tue May 04, 2010 9:43 pm

Thats a really nice valve. Can't wait to see it punch some holes in some plywood. i really like how you put the fill valves on the sprinkler valve.
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Unread postAuthor: jor2daje » Tue May 04, 2010 11:09 pm

I used the rubber corner piece on a cart, I had one that I took apart for my tricycle.
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Unread postAuthor: Technician1002 » Wed May 05, 2010 12:45 am

A quick note on PVC fatigue and survival. Just because it passes a few shots without breaking does not by any means it is passing as safe. I learned this with my Mouse Musket cannon. Over time it always would break the piston, even at low pressure. The piston was made from a 1 inch PVC pipe cap. I upgraded to HDPE, but the cannon developed another crack in the chamber, so it was retired.
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Unread postAuthor: Gun Freak » Wed May 05, 2010 7:05 pm

Technician1002 wrote:A quick note on PVC fatigue and survival. Just because it passes a few shots without breaking does not by any means it is passing as safe. I learned this with my Mouse Musket cannon. Over time it always would break the piston, even at low pressure. The piston was made from a 1 inch PVC pipe cap. I upgraded to HDPE, but the cannon developed another crack in the chamber, so it was retired.


I don't think the piston will be the parts that breaks, but the back threaded bushing, which is a rare unreplaceable fitting for me.'

Thats a really nice valve. Can't wait to see it punch some holes in some plywood. i really like how you put the fill valves on the sprinkler valve.


Thanks Marfy I put it on my golf ball guin today and it shot through my wood fence at 30 psi.. OOPS :D

I used the rubber corner piece on a cart, I had one that I took apart for my tricycle.

lolz how did you get a shopping cart
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Unread postAuthor: jor2daje » Wed May 05, 2010 7:11 pm

haha what teenager hasnt "acquired" a shopping cart for various activities. Or you can just find them in junk yards or recycling centers.
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Unread postAuthor: clemsonguy1125 » Wed May 05, 2010 7:17 pm

Funny enough my neighbor pulled oue of the woods behind our houses, wonder if there's anymore
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