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pneumatic burst disc?

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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pneumatic burst disc?

Unread postAuthor: Demon » Mon Aug 04, 2008 8:51 am

I was asking if putting a burst disk on a pneumatic ball valve canon would get better performance. because the time you open it the air will be blocked by the burst disk and the burst disk will blow after had opened completly the ball valve.

does it already exist? could it work?


thanks to reply.
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Unread postAuthor: Hubb » Mon Aug 04, 2008 8:53 am

This has been discussed before.

If the burst disk has a high enough rating, it should work. It surely wouldn't hurt performance.
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Unread postAuthor: brogdenlaxmiddie » Mon Aug 04, 2008 8:55 am

Its exactly what I did on the Dubya... Only one problem, Its damn near impossible to open the ball valve all the way before the disk ruptures. It does help however!
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Unread postAuthor: starman » Mon Aug 04, 2008 9:51 am

It's amazing that a burst disk of some sort could cure many of the ailes of many a slow actuating valve or poorly optimized combustion gun, but is rarely thought of or recommended.

I guess it's because a burst disk is usually viewed as an advanced concept and will require the builder some redesign.
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Unread postAuthor: brogdenlaxmiddie » Mon Aug 04, 2008 10:18 am

starman wrote: advanced concept and will require the builder some redesign.


Not quite- I first had the Dubya as a single 2" ball valve... then everyone was like "ARGGGGH BALL VALVE!" so, I was told to put a burst disk on there and I did. Just chop part of the barrel and voila!
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Unread postAuthor: Hubb » Mon Aug 04, 2008 10:19 am

^^Not only that, but it's more of a PITA (having to change the disks) than what it's probably worth.
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Unread postAuthor: SpudFarm » Mon Aug 04, 2008 10:24 am

i have tried a 1" burst disk that did not burst on 4x in my small hybrid and put it on a 150psi piston valve and holy shait it works good!

i may make some chrony readings for you
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 04, 2008 10:50 am

Another idea would be to have the breech end of the barrel slightly tighter in such a manner that the projectile would jam in place, thereby achieving the same effect without the hassle of using a burst disk.
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Unread postAuthor: SpudFarm » Mon Aug 04, 2008 11:05 am

to say it as i mean it - burst disks is the worst valve ever made!
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Unread postAuthor: starman » Mon Aug 04, 2008 1:59 pm

SpudFarm wrote:to say it as i mean it - burst disks is the worst valve ever made!


Worst...? or do you mean best, Spudfarm?
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