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Union Chamber Piece

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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Union Chamber Piece

Unread postAuthor: Atlantis » Fri Oct 13, 2006 10:43 pm

Does a union hold the same pressure as PVC pipe, I just need to know if it's safe to use as part of the chamber. I'm mostly concerned that the seal would'nt hold the air in.
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Last edited by Atlantis on Fri Oct 13, 2006 10:45 pm, edited 1 time in total.
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Unread postAuthor: killagorrila99 » Fri Oct 13, 2006 10:45 pm

Of course it will if it has the same markings as the pipe. I used a union on my supersonic gun and it holds fine!
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Unread postAuthor: MrCrowley » Fri Oct 13, 2006 10:45 pm

i heard you cant get them pressure rated or something but people use them anyway on hybrids.
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Unread postAuthor: Atlantis » Fri Oct 13, 2006 10:45 pm

Where exactly was your Union?
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Unread postAuthor: killagorrila99 » Fri Oct 13, 2006 10:52 pm

LOL !! if you cant find a 1 inch union dont build bd guns! Its just after the short section of 1 inch pipe, coming off the reducing adapter.
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Unread postAuthor: Atlantis » Fri Oct 13, 2006 10:58 pm

I've never seen your cannon. And what do you mean by bd guns? I just figure I should use a union instead of a threaded cap, so I can remove the piston more easily.
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Unread postAuthor: ProfessorAmadeus » Fri Oct 13, 2006 11:06 pm

Bd = Burst disc. Would this work for a piston cannon?
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Unread postAuthor: killagorrila99 » Fri Oct 13, 2006 11:08 pm

Yea, but burst disks are better than pistons, why not just use one of them?
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Unread postAuthor: MrCrowley » Fri Oct 13, 2006 11:17 pm

theyre a pain and a hassle i think :D
dont most people use them for hybrids coz of BD's so i doubt you could use it has a part of a chamber to hold pressure.
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Unread postAuthor: Atlantis » Sat Oct 14, 2006 5:02 pm

Finally a real answer. I plan on making a gun with a 1.5" coaxial chamber, I had the idea of using 2 unions as part of it so I could remove a segment of the chamber and replace it with a higher diameter chamber for more chamber volume without changing length.
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