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qev valve setup

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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qev valve setup

Unread postAuthor: twessel » Wed Dec 03, 2014 4:39 pm

Need some help to make this qev work. What's wrong with my.setup?
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Re: qev valve setup

Unread postAuthor: jrrdw » Thu Dec 04, 2014 5:31 pm

Looks to me like you have equal and constant pressure between the pilot and main chamber. You have to relieve the pilot chamber to make the QEV do it's thing.

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Re: qev valve setup

Unread postAuthor: twessel » Thu Dec 04, 2014 11:36 pm

Thank you got it working with a few mods. The needle valve slowly let's air fill the chambers but still allows quick discharge.

Any design mods to help a newbie? This is my first one.
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Re: qev valve setup

Unread postAuthor: jrrdw » Sat Dec 06, 2014 9:02 am

Question: Is the tubing in the back a active air passage or a sling for carrying?
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Re: qev valve setup

Unread postAuthor: twessel » Sun Dec 07, 2014 12:59 am

Yes. The back air line is active air pressure. It's a needle valve which is letting a small amount of air fill. About one shot a second.The small pipe is just so I can hook up compressor air.
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