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Old 02-05-2008, 04:48 PM   #1 (permalink)
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Andrewliu6294's Avatar
Join Date: Aug 2007

Valve blowback with CO2?

I've noticed that with my Kapp, whenever the internals begin to get cold after extended periods of firing with CO2, occasionally the valve will "super-fart" and recock the hammer automatically, spewing CO2 gas everywhere. This doesnt happen to my friends prostock, and he has the stock WGP valve.

I've tried 2 different CO2 compatible regs, not the problem. I'm guessing that when the valve gets cold, the o-rings sorta stop sealing, letting CO2 blowback the hammer?

If this is the case, anyone have a decent valve and a valve tool they'd be willing to get let go?
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Old 02-05-2008, 04:57 PM   #2 (permalink)
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Join Date: Apr 2006
Location: Albany. NY

You may want to look into ways to prevent CO2 liquid from getting into your gun.... use an anti siphon tube in your tank or mount it on an angle duck bill/asa to try and prevent liquid from leaving the tank....

If you do that you may see that you don't need a new valve... but that may not hurt... as it sounds like the valve stem/valve seal isn't all that tight any more.

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