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HELP on multishot QEV theory

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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HELP on multishot QEV theory

Unread postAuthor: jmez1996 » Fri Dec 03, 2010 10:29 am

i want to make a airgun which doesnt dump all the air at once but allows for multiple shots, and want to use a quick exhaust valve (piston valve) like this one:
http://cgi.ebay.com/Pneumatic-Quick-Exh ... 1312wt_775

if anybody has any ideas how this could be achieved, and with a explanation, it would be much appreciated.
thanks
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Unread postAuthor: Gaderelguitarist » Fri Dec 03, 2010 10:32 am

Use the search function. What you're planning has been done before on this forum.
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so many muchness
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 03, 2010 10:45 am

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Unread postAuthor: wyz2285 » Fri Dec 03, 2010 3:04 pm

Hammer valve + qev = multi shot, but not semi. for this case you could just separate the chamber with a ball valve :)
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Unread postAuthor: Brian the brain » Fri Dec 03, 2010 3:52 pm

Or go with a sleeve valve.THat would be the easy route to semi-auto.



Or...you could have a gas ram recock the hammer and load another round...But that would.. :roll: ..be....my ...next project???
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: lemming124 » Fri Dec 03, 2010 8:21 pm

exactly what I'm doing following a failed attempt at constructing a piston valve filled from chamber side :/
have a look at this: http://www.youtube.com/watch?v=q95-pUicykc
the T fitting houses a homemade piston valve that is reseated by a spring as seen in this video: http://www.youtube.com/watch?v=b4ZgXqiaySc
each time cracks the ball valve it filles a relatively small chamber, allowing for about eight powerful bb shots at 120 psi. copy his layout, replacing the homemade valve with a qev and the chamber with something pressure safe and you're good to go.
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