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Filling a piston from 'the other side'

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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Filling a piston from 'the other side'

Unread postAuthor: cyanite » Tue May 01, 2007 11:46 pm

Is it possible to fill a coax, piston spud-launcher from the front (barrel exit end) of the chamber.
Would this actuate the valve, if there was a fairly decent equilisation hole?
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Unread postAuthor: surfbum » Tue May 01, 2007 11:49 pm

how a standard barrel sealing piston valve works is by first pressurizing behind the piston to seal up the barrel, so air doesnt leak down, if you attempt to pressurize the other side first, the piston would not seal and air would just leak down the barrel

so no you can't pressurize a standard barrel sealing piston valve from the front of the valve
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Unread postAuthor: hi » Wed May 02, 2007 12:00 am

what he said /\
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Unread postAuthor: jackssmirkingrevenge » Wed May 02, 2007 2:24 am

It would work only if you had a spring holding the piston against the barrel (that would also serve as a handy bumper, but cut down on performance) and you filled it really slowly.
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Unread postAuthor: noname » Wed May 02, 2007 6:57 pm

surfbum wrote:so no you can't pressurize a standard barrel sealing piston valve from the front of the valve


I seem to be able to. Actually, my 2" valve refuses to be filled from the pilot side.
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