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would this piston design work

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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would this piston design work

Unread postAuthor: origin unknown » Tue Apr 24, 2007 10:06 pm

I have finished making this exept for the chamber. The chamber was too small in the 1st place; the gun wouldn't have enough air left over, after goin to the pilot valve, to go to the barrel. but it did open the piston just not much air came out the barrel for it to shoot anything which is the reason my 1/2" x 4" chamber needs to be bigger. just give some comments on my design and try to give suggestions.
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Unread postAuthor: Velocity » Tue Apr 24, 2007 10:11 pm

It might work, but honestly, I have found that piston valves need quality materials to work. In all of my valves, I use top quality neoprene sealing faces, and this has proved essential. It guarantees no leaks, and is a great asset. I am not sure whether your Nerf dart idea will work or not; it seems as though it would break apart or just fail to seal completely.

Also, make sure your piston seat diameter is great than the diameter of the barrel.
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 24, 2007 10:11 pm

Assuming the piston can travel freely and is a near perfect fit in the T fitting, I don't see why it shouldn't work.
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Unread postAuthor: origin unknown » Tue Apr 24, 2007 10:15 pm

rmich732 wrote:It might work, but honestly, I have found that piston valves need quality materials to work. In all of my valves, I use top quality neoprene sealing faces, and this has proved essential. It guarantees no leaks, and is a great asset. I am not sure whether your Nerf dart idea will work or not; it seems as though it would break apart or just fail to seal completely.

Also, make sure your piston seat diameter is great than the diameter of the barrel.


It is a greater diameter than the barrel hole, and it survived my test of blowing into it, it didnt leak. this may end up being my first piston gun, or my worst5 nightmare
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Unread postAuthor: Hotwired » Wed Apr 25, 2007 4:43 am

Mmm... just remember you can only generate a handful of psi by blowing - the pressure from a pump is a lot higher.

Just as long as the dart face can take the forces involved it should work.
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