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Piston Valve Question

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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Unread postAuthor: Fnord » Wed Oct 17, 2007 10:41 pm

You really want as little travel as you can(past 1/4th the barrel diam), as letting the piston accelerate more will put more stress on the fittings it hits when it goes back.
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 17, 2007 10:54 pm

_Fnord wrote:You really want as little travel as you can(past 1/4th the barrel diam), as letting the piston accelerate more will put more stress on the fittings it hits when it goes back.


Not only that but the more travel it has, the larger the pilot volume, meaning the pressure will drop at a lower rate therefore the piston will open slower, and that means less performance.
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Unread postAuthor: dapallox1 » Wed Oct 17, 2007 10:59 pm

Okay, thanks for all of the help guys, you all really helped clear things up for me. Thanks again. If I have any more questions, I'll post. :D
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Unread postAuthor: MrCrowley » Wed Oct 17, 2007 11:12 pm

jackssmirkingrevenge wrote:
Which one opens faster depends on this size of the piston and piston seat


Also weight of the piston, size of pilot chamber, pilot valve flow rate/opening time, size of equalisation hole...

I think it was barrel sealers open slower but have higher flow


Where did that come from?


No idea, somewhere though back in the day when I started out. Hence the 'I think' and 'i'm not 100% sure' in my post.
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