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Would this piston valve mod 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 valve mod work?

Unread postAuthor: us sniper » Mon Jul 09, 2007 1:51 pm

I am building a gun thaat reqiures that the chamer is inline with the barrel. I do not want a sprinkler valve because the gun is going to look realistic. Please tell me if this valve will work and if not how to make it work. This is my idea so far.

http://s153.photobucket.com/albums/s240 ... piston.jpg
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Unread postAuthor: noname » Mon Jul 09, 2007 1:57 pm

Have fun trying to seal something that's circular. Why not just make an inline diaphragm valve?
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Unread postAuthor: Infernal Maveric » Mon Jul 09, 2007 2:42 pm

That will take way too much time to get right to make it even worth it.

The spring above the piston would need to be really strong to get it to move downwards with X amount of force exhorted on it by air pressure.

Just use a spring loaded ball valve to get the desired effect, as this would most likely not work without a machine shop and a lot of practise/patience.
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Unread postAuthor: pyrogeek » Mon Jul 09, 2007 2:44 pm

Even if you could get it to seal, I'm guessing it would bind up and not move unless you had a huge spring. That would require more pressure in the pilot area, and it just wouldn't work well. If you had it pilot through where the barrel is, and change the piston around where it vents through the middle of the T, it would work.
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Unread postAuthor: us sniper » Mon Jul 09, 2007 4:49 pm

Are there any valves that would work? I do not want to use a ball valve because I am trying to make it look realistic. I am building a m16 pneumatic spud gun. The main tube of the gun would be 1 inch pvc.
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Unread postAuthor: turbohacker » Mon Jul 09, 2007 4:55 pm

Here is your solution... http://www.spudfiles.com/spud_wiki/index.php?title=Piston_valve

Here is a picture of mine...
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Now just cover the sprinkler valve with some more pipe and you will never knoe that it was their...
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If it walks like a dog, sratches like a dog, and barks like a dog, than its probobly a...-TURTLE, it's a TURTLE!!! Cant you see?!!!

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Unread postAuthor: noname » Mon Jul 09, 2007 5:25 pm

Or you can make your own inline diaphragm valve, which I stated in my original post....
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Unread postAuthor: us sniper » Tue Jul 10, 2007 2:10 am

Is there any way that I could get this to work because it is exactly what i was looking for. http://www.gizmology.net/pbm.htm
Noname, I searched but I was unable to find out how an inline diaphragm works. and I cannot use a regulare diaghpragm valve becuase I am trying to make it realistic. I would not get much power from the space between 1/2 inch and 1 inch pvc and the blow gun hose at the back would ruin the look of the gun.
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Unread postAuthor: noname » Tue Jul 10, 2007 10:39 am

Search the How-To's, I made one on them.
By a "regulare" diaphragm valve, do you mean a coaxial?
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