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How to seal a servicable piston?

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 seal a servicable piston?

Unread postAuthor: gwoloshyn » Sun Oct 07, 2007 3:34 pm

I want to make my piston valve serviceable by drilling 8 screws around the pilot area, I'm sure you all know what I'm talking about. If I can't cement the fittings how the hell do I make it a seal? What do I do?!?
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Unread postAuthor: Brian the brain » Sun Oct 07, 2007 3:39 pm

O-ring.
There is no substitute..
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: noname » Sun Oct 07, 2007 3:42 pm

You can spread room temperature vulcanization silicone sealant on the plug and in the socket, then glue it in. Wait 24 hours for it to cure, drill the holes for screws, and stick 'em in. If you need to take it apart, all you need to do is grab the plug in a vice and twist the T. It will break the silicone and you can pull it out.
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Unread postAuthor: knappengineering » Sun Oct 07, 2007 3:42 pm

I have had the same issue, try using silicone around the fitting because it should seal but you should be able to get it off if needed. (thats what happened for me, but could be different depending on the type of silicone)

Edit: noname beat me to it. :?
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Last edited by knappengineering on Sun Oct 07, 2007 3:44 pm, edited 2 times in total.
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Unread postAuthor: jrrdw » Sun Oct 07, 2007 3:43 pm

Brian the brain wrote:O-ring.
There is no substitute..


Just remember to measure more then once before you start cutting! Take your time, many of builders make easly avoidable mistakes by being in a hurry, myself included!
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When life gives you lemons...throw them back they suck!
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Unread postAuthor: noob of noobs » Sun Oct 07, 2007 4:54 pm

Although I've been working on it for ages, I'd recomend you use metal instead of PVC. I'm making a piston valve that's made mostly of galvanised steel, and the benefit to that is that you can service it very easily (just unscrew the pieces) and it's tough. Although a bit harder on the wallet, I think it's ovarall a bit more practical.

EDIT: I decided to use metal after I tried putting screws into the "T" twice (to make the piston servicable) and kept ruining the whole valve when I drilled the wrong types of holes.
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Unread postAuthor: gwoloshyn » Sun Oct 07, 2007 5:38 pm

How possible is it for self tapped screws only been screwed in/out once or twice to blow out when the chamber is pressurized above like 80 psi?
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Unread postAuthor: homedepotpro » Sun Oct 07, 2007 5:50 pm

gwoloshyn wrote:How possible is it for self tapped screws only been screwed in/out once or twice to blow out when the chamber is pressurized above like 80 psi?

not very, a screw has about a 16th of an inch surface area in which the air can push on, thats like 5 pounds. but a tap is only $7.
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Unread postAuthor: jrrdw » Sun Oct 07, 2007 5:52 pm

Self tapping screws mite crack your tee. I've seen them tear sheet metal.
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Unread postAuthor: gwoloshyn » Sun Oct 07, 2007 6:06 pm

Whoops, i meant a machine screw that I tapped without using a tap :)

Guess my question is answered. thanks
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Unread postAuthor: noname » Sun Oct 07, 2007 6:13 pm

I've never used a tap for screws, and nothing using them have blown apart. As long as the hole you drill isn't too small, and there isn't too much stress on the fitting, it should work fine.
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