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Check Valve Semi/Full Auto?

A place to ask general spud cannon related questions.
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Check Valve Semi/Full Auto?

Unread postAuthor: noname » Thu Sep 14, 2006 9:28 pm

Is it possible to use a check valve to make a semi or full auto cannon? Look at the diagram and tell me what you think.
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Check Valve semifullauto.JPG
The piston inside the valve end of the barrel would push back the check valve's sealing manifold and let air in. This would probably only work for BBs and small things though.
Check Valve semifullauto.JPG (6.33 KiB) Viewed 1087 times
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Unread postAuthor: SpudStuff » Thu Sep 14, 2006 9:32 pm

That could work! I have an ajustible check valve. I might try that.
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Unread postAuthor: carlbelcher » Thu Sep 14, 2006 10:31 pm

Keep in mind that you're pushing against about 150 pounds of force for a 1" valve at 100psi to open that check valve...
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Unread postAuthor: noname » Fri Sep 15, 2006 5:50 pm

So use like springs and pulleys or whatever to reduce the pressure it would take to open it. And it would only shoot BBs or something small, so you'd only need like 60 psi.

EDIT: I made an animation! (That Unfreez thing salad said was good is really easy)
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BBGUN Animation.gif
The piston that the handle is attached to should be moving, but I didn't waste the time doing that.
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Unread postAuthor: POS » Sat Sep 16, 2006 7:01 am

Like already said, you need to push back 150 punds, that is a whole lot to do with just a few fingers.
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Unread postAuthor: noname » Sat Sep 16, 2006 10:44 am

And that's with a 1" valve at 100 psi, like I already said, isn't it? You could use springs and pulleys or whatever to reduce the amount of force needed.
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Unread postAuthor: carlbelcher » Sat Sep 16, 2006 3:45 pm

I know it seams like a check valve is a viable option, but the fact of the matter is that you can't use a check valve as a main valve of a potato cannon. Trust me I've spent many hours trying to think of a way. Even at 60 psi with a 1/2" valve that's 47 pounds of force to deal with. The fact of the matter is that it's inefficient and overcomplicated.

K.I.S.S. (keep it simple stupid)
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Unread postAuthor: noname » Sat Sep 16, 2006 5:39 pm

Doesn't mean I (or someone else) can't try it.
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Unread postAuthor: carlbelcher » Sat Sep 16, 2006 5:46 pm

I'm not saying that you can't try it.

I'm just saying that it won't work very well, if at all.
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