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Semi auto firing 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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Semi auto firing piston valve

Unread postAuthor: Gun Freak » Sat May 08, 2010 9:11 pm

Well I want to discuss why some piston valves can fir semi-automatically but some can't. My co-ax could fire semi-automatically with no problems seating but my 2" tee piston cannot, even though it has a check valve piston and my co ax piston was crap. They both used a 1" sprinkler pilot. What do you guys think? that are your experiences with semi-automatic firing piston valves?
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Unread postAuthor: clemsonguy1125 » Sat May 08, 2010 9:14 pm

Try adding a spring to your tee valve
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Unread postAuthor: Gun Freak » Sat May 08, 2010 9:20 pm

My bumper acts pretty much like a spring cuz it is the foam, and it is pretty big. My coax didnt use a spring and it could so semi auto.
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Unread postAuthor: clemsonguy1125 » Sat May 08, 2010 9:21 pm

I use a spring on my gb gun and It immeditaly seals so I can pump it up with a bike pump
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Unread postAuthor: Hubb » Sat May 08, 2010 9:23 pm

It depends on how well and how quickly it seals. By design, a coaxial will seal better than a piston valve. In a tee piston, the larger volume providing the force to hold it shut is coming from just one side. But in a coaxial, the volume of air pushing on the seal is the same all the way around.
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Unread postAuthor: Gun Freak » Sat May 08, 2010 9:23 pm

Mine is able to be pumped with a bike pump as it is
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Unread postAuthor: clemsonguy1125 » Sat May 08, 2010 9:24 pm

Well do you have a loading mech built yet like cman11's I mean I wont hurt anything, I yanked mine out of a busted nerf gun
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Unread postAuthor: jor2daje » Sat May 08, 2010 9:24 pm

you need a lot more flow to seat larger pistons in shorter times for semi auto firing. Your coaxial probably worked because it only took a little air to seat it, whereas the larger golfball gun needs a lot more air to seat and fill the chamber so it wont function as effectively as a semi auto.
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Unread postAuthor: Gun Freak » Sat May 08, 2010 9:27 pm

alright thanks guys, i want planning on shooting it semi auto with a loading mech, just wondering.
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Unread postAuthor: velocity3x » Sun May 09, 2010 10:41 am

Comparing the performance of a small diameter Co-ax to a large diameter piston isn't the best comparison.
However, a large diameter piston valve can be designed / constructed to work in semi or full-auto mode as well (if not better) than a small co-ax. The issues of volume, reseating and flow inherent to large diameter piston valves needs to be addressed in the initial design.
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