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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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Piston Valve

Unread postAuthor: ShowNoMercy » Mon Apr 23, 2007 4:02 pm

I plan on making a steel piston valve and hopefully not use any Orings but I had a few questions. I was wondering what size pilot hole is needed to be put in the piston for equalization to happen? Also what should I use for a bumper behind the piston?
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Unread postAuthor: super spuder » Mon Apr 23, 2007 4:41 pm

i dont know about the equalization hole but put a spring and some foam behind the piston as a bumper
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Unread postAuthor: jrrdw » Mon Apr 23, 2007 4:56 pm

My equilazition hole is 1/8th and under the barrel seal, instent check valve.
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Unread postAuthor: hi » Mon Apr 23, 2007 5:05 pm

you dont need an equilization hole if it doesnt hvae O rings, trust me.


You definatly need a bumper. it would have to be a spring AND foam. a steel piston would be so hard that it would simply shader the pvc if you dont have a very good bumper.
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Unread postAuthor: spudthug » Mon Apr 23, 2007 5:08 pm

use a different piston the less weight the better...hi my piston that u helped with didnt have orings and it needed equalization holes..it wouldnt let any air throguh barely
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Unread postAuthor: homeflake210 » Mon Apr 23, 2007 5:13 pm

A circular piece of neoprene will work well for a piston bumper.
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Unread postAuthor: ShowNoMercy » Mon Apr 23, 2007 5:14 pm

Well the whole thing is steel, so do I still need a bumper?
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Unread postAuthor: hi » Mon Apr 23, 2007 5:15 pm

spudthug wrote:use a different piston the less weight the better...hi my piston that u helped with didnt have orings and it needed equalization holes..it wouldnt let any air throguh barely


thats true, i forgot about that. i just know that none of my pistons have O rings or equilzation holes. does your piston still work ok spugthug?
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 23, 2007 5:17 pm

ShowNoMercy wrote:Well the whole thing is steel, so do I still need a bumper?


Why not, you'll only cause unnecessary stress to the structure if not.
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Unread postAuthor: ShowNoMercy » Mon Apr 23, 2007 5:18 pm

Ok so I guess I need to build something, would a spring work?
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Unread postAuthor: jrrdw » Mon Apr 23, 2007 5:22 pm

Springs work well if you get the rite one, lenth, tension, ect...
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Unread postAuthor: ShowNoMercy » Mon Apr 23, 2007 5:23 pm

Well I am trying to continue a machined type of cannon theme, so I guess that a spring is my only real choice.
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