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Quick exhaust valve from Humphrey, what's the problem?

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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Unread postAuthor: psycix » Fri Jul 11, 2008 12:33 pm

I mean that with blowing, the velocity is too low to measure to give a good flow comparison.
But when the air comes further near the speed of sound, the effects of blocking flow will increase.
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Unread postAuthor: ozzioutlaw » Tue Oct 16, 2012 8:47 am

hey guys. i was thinking of buying one of these Humphrey qevs for my next project its only a 1/4 will i have any problem with blockage at 200-400psi?? the barrel is going to be slowly reduced to a 4mm barrel the 1/4 qev is around around 6.2 mm i wana reduce it to 4mm for my pellets
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