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Quick Semi-Auto Question

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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Quick Semi-Auto Question

Unread postAuthor: grock » Mon Nov 09, 2009 2:00 am

I've seen dozens of posts about hammer valves, etc, but couldn't semi auto be achieved with a constant supply of air and a sprinkler valve/qev?
is that option just less efficient/powerful?

Thanks
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Re: Quick Semi-Auto Question

Unread postAuthor: jackssmirkingrevenge » Mon Nov 09, 2009 3:49 am

grock wrote:I've seen dozens of posts about hammer valves, etc, but couldn't semi auto be achieved with a constant supply of air and a sprinkler valve/qev?
is that option just less efficient/powerful?


Certainly, the important thing is that you're feeding air in such a manner that your valve reseats as soon as you close the pilot, for this reason I suspect a QEV is a better idea than a sprinkler valve.

Since you're dumping air through the pilot it would be a bit less efficient than a hammer valve but certainly has the potential to be much more powerful, especially for larger calibres.
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Unread postAuthor: inonickname » Mon Nov 09, 2009 4:11 am

It will work as long as your pilot has more flow than the inlet. Horribly inefficient though, It's better to use something which closes the inlet on firing.
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Unread postAuthor: Ragnarok » Mon Nov 09, 2009 11:30 am

inonickname wrote:Horribly inefficient though, It's better to use something which closes the inlet on firing.

Suggestion on my part: Slide/Sleeve valve, at least if a QEV is being used.
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