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QEV size

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 size

Unread postAuthor: VH_man » Tue Mar 06, 2007 5:51 pm

Could someone give me the Specs on a 1/4 inch QEV? im attempting to make an HMG (heavy machine gun) replica for airsoft skirmishes. i am using the QEV + Saftey Pop valve for actuation. and anyone whose seen saftey pop valves go off, how far do they go back? Im thining of using that as a blowback mechanism to load the next BB.
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Unread postAuthor: Hotwired » Tue Mar 06, 2007 6:25 pm

Could be easier if you said which type you're on about (piccie!).

The type I'm using is said to be good to 300psi. Leave a couple of cm behind the relief valve for it to recoil into if you're planning on a compact design. They don't pop out more than that to open the exhaust holes.

If you have a look at these: http://www.airlines-pneumatics.co.uk/webcat/vit.asp?SubCat=86 you can see the kind of distance the sprung sealing head has to go to open to the exhaust holes.
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Unread postAuthor: VH_man » Tue Mar 06, 2007 8:55 pm

Thanks, that SHOULD be enough to move the breech closed so i dont have a strafer style firing...... and i said, its a 1/4 inch QEV, the one with the 1/8 NTP exhaust and everything else 1/4 inch. it has to be below 3.5 inches, im modeling this thing off the M2 .50 cal Browning anti-aircraft gun.
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