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Quick Opening Valves?

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: Technician1002 » Wed May 13, 2009 7:20 pm

jeepkahn wrote:You have to not only look at the valve, but also how much proximal volume is available to the valve/barrel.. theoretically your gun would actually benefit from the chamber to barrel ports being centered(frt to rear) in your chamber, as opposed to being rearward or forward...

The reason the valve is not centered is because I am using screw on barrels. The valve size is sized for easy to obtain material and cost. Going over 2 inch becomes a cost and strength issue.

With the barrel possibly quite a bit larger than the valve, (used up to 4 inch barrel) the shorter the restricted flow the better. In testing we got the best t shirt launch distances with the 3 inch barrel when we were expecting the 2.5 inch to be the distance winner.

If there were no removable barrel and a step change in diameter from the valve to the barrel, then yes a chamber center design would be best.
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