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QEV fill location

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 fill location

Unread postAuthor: Bluetooth » Fri Dec 29, 2006 10:56 am

I plan on making a gun with a QEV. Do I have to fill it from the back/exhaust port or can I fill it from the chamber?
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Unread postAuthor: mobile chernobyl » Fri Dec 29, 2006 11:38 am

the chambers fine, i've also seen people fill it throught the pneumatic actuation port on the qev itself.
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Unread postAuthor: mark.f » Fri Dec 29, 2006 12:12 pm

No. It depends on which type of Q.E.V. you actually use, but the ones you get off McMaster and a lot more that are commonly sold need to be filled from the pilot. It's because of what they're designed to do. You fill the air cylinder but injecting air through the "IN", (pilot), port, and it goes through the "CYL", (chamber), port into the air cylinder. Pressure drop on the "IN", (pilot), side causes the valve to exhaust to the "EXH", (exhaust), port, which usually isn't connected to anything, (except in applications where exhaust needs to be vented to a safe location).
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