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Using a spring to seal a 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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Using a spring to seal a piston?

Unread postAuthor: spudkilla224 » Mon Jul 06, 2009 6:55 pm

Hello everyone, i'm building a new piston valve aircannon and I have the problem were the piston won't seal foward its self. But it will exhaust perfectly fine. I have to push the piston to seal against the barrel to make it work.

So I was wondering how can I use a compression spring to push the piston foward to seal against the barrel? And be able to attach a bumper to the spring in the back of the tee?

The piston cannon is serviceable.

Any help would be appreciated!

Thank You! :D
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Re: Using a spring to seal a piston?

Unread postAuthor: velocity3x » Mon Jul 06, 2009 7:09 pm

spudkilla224 wrote: I have to push the piston to seal against the barrel to make it work.
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Last edited by velocity3x on Wed Jan 13, 2010 4:28 pm, edited 1 time in total.
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Unread postAuthor: geardog32 » Mon Jul 06, 2009 10:23 pm

im assuming this is a t fitting valve. i would say if you are filling from behind you need a larger piston so that when you fill the small chamber behind the piston builds faster than the tank pushing it forward. if you were to use a spring i would say a very light one, just enough to move it forward.
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