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a new type of piston valve

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: boyntonstu » Thu Nov 12, 2009 7:59 am

Brian the brain wrote:It would be better to angle the seat and piston and not run it across the tee.

Just add a guiderod ( off center) to ensure the piston lines up with the 45 angle..

And voila.
Give it extra travel and you'll have a 100 % flow, inline cannon..

:shock: :roll:


A sketch would be appreciated.
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Unread postAuthor: john bunsenburner » Thu Nov 12, 2009 12:11 pm

Also, to avoid having to "double fill" once for the pilot, once for the chamber i recomend an angled EQ hole from the bottom part of the piston to the chamber, past the O ring.
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Unread postAuthor: Technician1002 » Thu Nov 12, 2009 2:10 pm

A picture is worth...

This piston has no rings. The hole is drilled from the edge near the face to the center of the rear, from the chamber to the pilot area.
Image
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Unread postAuthor: blackhawk13 » Thu Nov 12, 2009 4:52 pm

john bunsenburner wrote:Also, to avoid having to "double fill" once for the pilot, once for the chamber i recomend an angled EQ hole from the bottom part of the piston to the chamber, past the O ring.


whats an eq hole?
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Unread postAuthor: grock » Fri Nov 13, 2009 2:02 am

its an equalization hole, one that connects the chamber and the pilot area, so you can just fill through the pilot and not have to "double fill" as stated above

EDIT: makes a little more sense now, wording was weird
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Unread postAuthor: blackhawk13 » Fri Nov 13, 2009 9:26 am

ok thanks. but when you trigger the pilot valve some pressure will leak out that hole from your main chamber. this valve was designed so that would not happen.
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Unread postAuthor: grock » Fri Nov 13, 2009 7:26 pm

there are two ways that the eq hole is usually made. one is with a hole that is so small that the lost energy is not noticealbe. unfortunately, that usually means that the chamber takes forever to fill, so sometimes a larger hole is made, and a check valve (one way) is used. the problem with this one is that if there is any leak in your pilot area or triggering system, it could result in accidental firing. on my gun, i fixed that problem by designing a check valve that doesnt seal completly, but seals well enough that when the pilot is vented, the gun fires
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