Piston Valve

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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ShowNoMercy
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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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super spuder
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i dont know about the equalization hole but put a spring and some foam behind the piston as a bumper
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My equilazition hole is 1/8th and under the barrel seal, instent check valve.
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hi
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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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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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homeflake210
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A circular piece of neoprene will work well for a piston bumper.
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ShowNoMercy
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Well the whole thing is steel, so do I still need a bumper?
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hi
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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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jackssmirkingrevenge
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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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ShowNoMercy
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Ok so I guess I need to build something, would a spring work?
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Springs work well if you get the rite one, lenth, tension, ect...
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ShowNoMercy
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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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