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Rectangle Qev

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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Rectangle Qev

Unread postAuthor: elitesniper » Sun Dec 06, 2009 12:04 am

Hey guys been a while, help me here.. is this the same as a regular shuttle qev http://cgi.ebay.com/Pneumatic-quick-exh ... 45ee3a9dac
anyone one use these before? good air flow or what?
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Unread postAuthor: inonickname » Sun Dec 06, 2009 12:41 am

Bad air flow. I have a Bellpro one and the ports are rather small for the size.
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Unread postAuthor: elitesniper » Sun Dec 06, 2009 1:45 am

will it be good in piloting a 1'' coax copper piston with a 1/2'' barrel? or should i go with this qev? http://cgi.ebay.com/Pneumatic-Quick-Exh ... 3ca1f7b400
sorry guys im new to qevs never used one!
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Unread postAuthor: psycix » Sun Dec 06, 2009 9:13 am

The second QEV you posted is probably way better. Go with that one.
It'll pilot your 1" piston valve, but a 1/2" ball valve may give slightly better results.
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Unread postAuthor: Daltonultra » Mon Dec 07, 2009 2:34 am

elitesniper wrote:will it be good in piloting a 1'' coax copper piston with a 1/2'' barrel? or should i go with this qev? http://cgi.ebay.com/Pneumatic-Quick-Exh ... 3ca1f7b400
sorry guys im new to qevs never used one!


Better yet, if you're not set on a coax, you can use a larger version of that valve as a piston. I've had great results with this one: http://www.fastenal.com/web/products/de ... ku=0443031

It doesn't take much of a pilot valve, either. This little guy is plenty if your pilot volume isn't large: http://www.mcmaster.com/#6790t42/=4tocmx
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