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Valves, the difference opening time makes.

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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Valves, the difference opening time makes.

Unread postAuthor: Zen/// » Fri Jan 18, 2008 10:31 pm

I wondered what a high speed blast of air would do to something, so at point blank, I fired blank shots out of my burst disk/ball valve sniper at paper.

Image Ball valve 70psi

Image Burst disk 70psi

Opening time>psi

Both at 70psi from point blank with the Gepárd SSAMR.
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Unread postAuthor: bigwick » Fri Jan 18, 2008 10:40 pm

wow, what a difference. i have a question. i have researched it and searched for it only to come back with no results. i know how a burst disk works, but i dont understand how it is set up and what to use. can you help?
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Unread postAuthor: Zen/// » Fri Jan 18, 2008 10:42 pm

http://www.spudfiles.com/spud_wiki/inde ... Burst_disk

http://www.spudfiles.com/spud_wiki/inde ... burst_disk

My cannon is simply a ball valve behind a burst disk.
It luckily gives a 2 sec delay from actuating the ball valve and the disk ruptureing, giveing time for aiming and turning the ball vlave.

http://www.spudfiles.com/forums/viewtop ... tml#149682

http://www.spudfiles.com/spud_wiki/inde ... ening_time
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Unread postAuthor: bigwick » Fri Jan 18, 2008 10:48 pm

ok ok thanks alot ill look at the links in a min
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Unread postAuthor: Hotwired » Fri Jan 18, 2008 10:57 pm

:?:

Thats some freaky tearing on the burst disk one.

I can't say I've personally opened up on a sheet of A4 at point blank with an air round but that sheet's been torn in half and bits were nibbled from the edges.

Very odd.


But otherwise, yeah opening time improves air dumping a lot. You just can't manually open a ball valve in anything like the time a disk splitting or a pressure difference in a piston/diaphragm can.
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Unread postAuthor: Zen/// » Fri Jan 18, 2008 10:59 pm

Its not a scam or anything, I was suprised as well.

"Wtf thats not possible" Looks at the ripped edges*

edit: The paper was leaning against the barrel, no backrest. It flew about 3 feet back...

Edit: In pieces
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Unread postAuthor: bigwick » Fri Jan 18, 2008 11:06 pm

ok zen your links didnt help. thats the part of the burst disk information i already knew. i was looking for directions or diagrams of how to install or connect a burst disk valve.
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Unread postAuthor: thespeedycicada » Fri Jan 18, 2008 11:09 pm

just get a union and you should figure it out from there.

im guessing you know what a union looks like?
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Unread postAuthor: Zen/// » Fri Jan 18, 2008 11:11 pm

http://www.spudfiles.com/spud_wiki/inde ... itle=Union

union

Whoa, i just realized your avatar was a salamander in a pipe.
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Unread postAuthor: bigwick » Fri Jan 18, 2008 11:12 pm

no now you lost me. whats a union? is that like a coupling?
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Unread postAuthor: thespeedycicada » Fri Jan 18, 2008 11:13 pm

thanks zen/// im too lazy to find links and post them *sigh* :(
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Unread postAuthor: bigwick » Fri Jan 18, 2008 11:14 pm

ok im sry for my last post, i didnt click the link. well anyway so basicly r they readily available like sprinkler valves?
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Unread postAuthor: thespeedycicada » Fri Jan 18, 2008 11:20 pm

Zen! its not a salamander its a leopard gecko! named cheerio! and she is in fact in a barrel of an older cannon unfortunately she is gone now :cry:
but you can expect my bird displaying his beautiful self on my beautiful piston gun as my new avatar soon!
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
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Unread postAuthor: bigbob12345 » Fri Jan 18, 2008 11:20 pm

Bigwick you can eaisaly find them up to 2in in size at almost any hardware store.
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Unread postAuthor: bigwick » Fri Jan 18, 2008 11:23 pm

thanks bigbob your great
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