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A pneu Pneu idea

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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A pneu Pneu idea

Unread postAuthor: brogdenlaxmiddie » Mon Jan 07, 2008 4:06 pm

Okay. So, i needed something to dump tons of air and super fast... so i was told to use a burst disk or a piston valve. I thought it would be easier for me to use a burst disk. So i unfortunately already bought a 2" bronze ball valve and had that laying around. So what if i used the ball valve to release the pressure to then go against the burst valve and then break that releasing the projectile to untold speeds... (LOL) but i wanted to use the ball valve so that i could determine when the cannon would fire, as opposed to it just going off when there was enough pressure. I was hoping that there would be just enough time for me to fully open the ball valve before the burst disk would break. What do you guys think?
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Unread postAuthor: thespeedycicada » Mon Jan 07, 2008 4:13 pm

Thats exactly what THE STING! is its hard to make it powerful though.You need a burst disc that bursts a little higher than the pressure you are using.its what i did annd its an improvement over my sprinkler valve.
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Unread postAuthor: SpudFarm » Mon Jan 07, 2008 4:17 pm

yeah that works i have done it on a ballvalve gun gets better atleast
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Unread postAuthor: brogdenlaxmiddie » Mon Jan 07, 2008 4:25 pm

i see. I hadn't seen the sting before... but hey, great minds think alike!
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Unread postAuthor: MrCrowley » Mon Jan 07, 2008 4:34 pm

Like discussed in 'The Sting', the ball valve constricts flow, piston valves aren't too hard :)
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Unread postAuthor: DYI » Mon Jan 07, 2008 4:35 pm

Do you have a compressor/compressed gas cylinder?

If so, use the ball valve as a trigger, putting it between the air line and the chamber. This way, opening the valve will fill the entire chamber until the disk bursts, rather than opening about 1/4 before the disk breaks. This is the mechanism the MBDC uses, and I believe it is fairly powerful for its caliber (.787) and pressure (500 psi).
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Unread postAuthor: brogdenlaxmiddie » Mon Jan 07, 2008 8:31 pm

i do have a compressor.... however, its my dad's and he got one to paint our dock box for our yacht. so it only goes up to like a max of maybe 130 psi... :oops: but Oh well. thanks guys for your ideas!
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Unread postAuthor: BigJon » Mon Jan 07, 2008 9:16 pm

130 psi is plenty. Just do a few test to find what pressure is required to burst the disks. My compressor only goes to 130psi also and even at 60psi I get good performace out of a burst disk valve.
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