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Piston Design Feedback

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 Design Feedback

Unread postAuthor: tape fist » Sun Jan 25, 2009 10:00 pm

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Thank you in advance.
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Unread postAuthor: MrCrowley » Sun Jan 25, 2009 10:11 pm

Yeah...your barrel is the same size as the piston. Or in technical terms, your 'seat' is the same diameter as the piston's sealing face. Meaning there is no piston/seat area differential. Without this sealing face area exposed to pressure, the piston will have difficulties working.

I suggest you read more on WHY pistons work. What makes a piston valve work? Ask yourself that question, and you will see that you have no unbalanced force, forcing the piston back when the pilot volume has been exhausted.

Edit:
Image

That's a diagram 'thedeathofall' made for another topic, it shows the flaw in your design that I talked of.
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Unread postAuthor: tape fist » Sun Jan 25, 2009 10:23 pm

so how would i make an equalization hole?sorry if im asking to many questions.
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Unread postAuthor: MrCrowley » Sun Jan 25, 2009 10:26 pm

What's an equalization hole go to do with what I said?

Go to the SpudWiki, in the search tool type in 'piston valve'. Start there.
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Unread postAuthor: psycix » Tue Jan 27, 2009 9:42 am

You only need an equalization hole if your piston seals PERFECTLY along the sides. That means that you have applied orings in the proper way.
But then I would go with a floating o-ring which acts like a check valve.
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