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Low Pressure CO2 semi auto QEV design

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Low Pressure CO2 semi auto QEV design

Unread postAuthor: nerfo » Sat Oct 23, 2010 11:19 pm

I want to make a small(ish) semi auto QEV, that requires relatively little fabrication, for use with <45psi

I plan to use a Palmers CO2 cartridge regulator http://www.palmer-pursuit.com/cart/inde ... cts_id=618 for my source.

I want to be able to cycle the shots fairly quickly, so I figured a check valve filled from the pilot side. I think the bolt should be easy to do, just a hole down the middle and a partial thread for a grub screw, then another hole in the side.

Heres what Ive come up with so far

...this is for a nerf maverick :lol:
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Unread postAuthor: lozz08 » Sun Oct 24, 2010 1:53 am

It looks like a really nice valve setup and that would give you bolt-action yes?
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Unread postAuthor: Crna Legija » Sun Oct 24, 2010 1:56 am

in place of the two fill/pilot valves you use a three way valve
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Unread postAuthor: POLAND_SPUD » Sun Oct 24, 2010 5:52 am

two fill/pilot valves you use a three way valve
yes, my padawan is right :wink:


Check these guns - they all use the same design:
http://www.spudfiles.com/forums/i-too-h ... 21039.html
http://www.spudfiles.com/forums/semiaut ... 20259.html
http://www.spudfiles.com/forums/semi-au ... 21799.html
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Unread postAuthor: nerfo » Mon Oct 25, 2010 5:25 am

lozz08, its not bolt action, I just used bad terminology, I was referring to the piston.

Cheers for the advice on the 3-way, I hadnt yet thought about what to use there. Had some trouble finding something appropriate untill I came across clippards range of miniature valves http://www.clippard.com/catalog/Page%20110.pdf Im looking at the J-series spool valve.

scale reference to the blaster to be modded:
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Unread postAuthor: POLAND_SPUD » Mon Oct 25, 2010 7:11 am

yeap, that's the right valve (MJVO-3)
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