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Leaky QEV part II

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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Leaky QEV part II

Unread postAuthor: achs_xc » Tue Jan 27, 2009 10:45 am

Thanks for the comments. OK...I checked a few areas and found 3 leaks....fixed those. I even opened the QEV to clean it out. The gun still leaks from the barrel. Actually, the gun will pressurize up to about 40 psi and when I disconnect the air hose, the gun completely discharges. I am filling from the pilot side and I believe I have the QEV orientation correct...or at least an orientation that lets me pressurize. Here is a pic to assist.
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Unread postAuthor: POLAND_SPUD » Tue Jan 27, 2009 10:57 am

is it a male quick connect fitting or a tire valve?

wait.... your blowgun leaks becasue it's connected the other way round...
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Unread postAuthor: psycix » Tue Jan 27, 2009 11:47 am

Indeed, the blowgun is made to receive pressure from the other side.
The gun fires on releasing the air hose? Thats a schrader valve you are using there right?
Well, on disconnecting, it leaks out air, simply pilotting the valve and BLAM.
Disconnect it really fast or use a check valve. Another method is to use a small balvalve inbetween and close it before disconnecting.

You're sure you tightened everything up with a wrench and used enough teflon tape (5 layers).
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Unread postAuthor: achs_xc » Tue Jan 27, 2009 12:23 pm

Thanks...I'll tweak it.
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Unread postAuthor: achs_xc » Tue Jan 27, 2009 2:47 pm

Switched the blow gun around...now I can get up 60 psi when I disconnect quickly. I still get a bit of hissing from the barrel, but I still have enough air to launch my nerf dart!
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