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i think i messed up my barrel sealing tee

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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i think i messed up my barrel sealing tee

Unread postAuthor: singularity » Sun Apr 29, 2007 7:53 pm

i just a built a barrel sealing tee valve, after i was done i looked at and thought about how it worked. at that moment i realized im really stupid. on my valve when i empty the pilot chamber there is no opposing force to open the valve. basically it will empty all the air through the pilot chamber if my lodgic is correct. heres a diagram

<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/teevalve-1.jpg">

now thinking about it i should have pushed the pipe which leads to the barrel further back, right?
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Unread postAuthor: deusXmachina » Sun Apr 29, 2007 8:05 pm

If your piston has o-rings, it shouldn't matter. Once the air starts to leave the pilot, the chamber air will want to move to equalize it, it can't go out the barrel, its only free direction is to the pilot, and since it can't go around it because of the o-rings, it will push the piston back. Because of kinetic vs static friction, once it gets moving, it should slide all the way back until fully open.
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"On a scale from 1-10, I hope you fall in front of a bus."

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Unread postAuthor: super spuder » Sun Apr 29, 2007 8:06 pm

yea. i think if you pun the spring on the other side it should work. or did you glue the end cap on?
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Unread postAuthor: scatdawg » Sun Apr 29, 2007 8:06 pm

yes, either that or if you can take away material from the piston in the center part that is located in line with the tee. that would give it a place for the chamber air to act against it.
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Unread postAuthor: singularity » Sun Apr 29, 2007 8:18 pm

scatdawg your a genius, thank you

as for the putting the spring in front it wouldn't seal because the compressed spring is to big.

i am so glad i didn't glue the end cap on
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Unread postAuthor: keep_it_real » Sun Apr 29, 2007 8:53 pm

I would get a threaded coupler and threaded end cap instead of a slip end cap so if you have problems in the future (likely) you can fix them without sawing it apart.
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Unread postAuthor: super spuder » Sun Apr 29, 2007 9:00 pm

yea, that would be a really good idea. that is what i did on my piston valve
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