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Dual valves

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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Dual valves

Unread postAuthor: Shadowscion » Tue May 01, 2007 6:18 pm

When using two valves linked to one exhaust, is it better to have two separate chambers or should they be connected? I am building a fairly large cannon soon with dual valves and I think I should research somethings before buying parts :P
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Unread postAuthor: MisterSteve124 » Tue May 01, 2007 6:30 pm

have them connected. You could just do this with a peice of hose or something else. Well I guess it may not matter if theyre seperate or not but it would be easier to fill and its not that hard to do.
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Unread postAuthor: Shadowscion » Tue May 01, 2007 6:31 pm

So have a length of hose at the end connecting the two together?
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Unread postAuthor: chaos » Tue May 01, 2007 6:37 pm

yer i'd go with as much air as you can hold so go with 2 chambers.
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Unread postAuthor: spudthug » Tue May 01, 2007 7:19 pm

yea look at this gun :?

http://www.spudfiles.com/forums/dual-3- ... t4650.html

jsut do something like that
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4" piston valved cannon-half done..( i spilt my cement...)

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Unread postAuthor: Shadowscion » Tue May 01, 2007 8:10 pm

Would two 24"long 3" chambers flowing into two 1" valves restrict airflow a lot?
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Unread postAuthor: chaos » Tue May 01, 2007 8:20 pm

what size barrel are you planning on?
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Unread postAuthor: Shadowscion » Tue May 01, 2007 8:32 pm

A multitude of sizes, mainly a golfball barrel and probably a 2" barrel also.
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Unread postAuthor: chaos » Tue May 01, 2007 8:55 pm

ya should try and make a piston man you will be happy with the results compared to a sprinkler
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Unread postAuthor: Shadowscion » Tue May 01, 2007 8:57 pm

I have the valves already piston is a no-go for this project.
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Unread postAuthor: frankrede » Tue May 01, 2007 9:16 pm

well go return teh valves and use the money on a piston valve.
They are quite easy to build.
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Unread postAuthor: Shadowscion » Tue May 01, 2007 9:24 pm

Can't really do that, these valves were purchased ages ago. Anyways back to my question please.

PS: Made this 3d of what we(my dad and I) plan on building.
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Unread postAuthor: chaos » Tue May 01, 2007 10:30 pm

better yet use those valves as pilots for a DUAL PISTON gun that would be insane i don't think it even been done before :shock:
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Unread postAuthor: jackssmirkingrevenge » Tue May 01, 2007 10:47 pm

If I could make a reccomendation...
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save yourself some pilot volume and get better efficiency ;)
improved.JPG (11.86 KiB) Viewed 769 times
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Unread postAuthor: Shadowscion » Wed May 02, 2007 3:00 pm

Anyways...

Which of these configurations would yield the best results?
Image

Attached is the ggdt sheet for the gun we want to build. I tried it with both 3" and 2" chambers, the 3" yielded only 8~fps and 1ms more than the 2" chamber for some reason, so I think we will go with the 2" chamber. The projectile used was a golf ball. This sheet more than tripled the fps of my current golf ball cannon(what does that say about it -.-) and I am already amazed with the one I have.

I don't know how accurate this is though as I don't know the CV of my valves.
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