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Metal union sealing

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Metal union sealing

Unread postAuthor: spanerman » Sat Aug 18, 2007 8:51 am

Hi guys, i have a 3/4 steel union in my hybrid...ive only used bicycle iner-tubes which seem to be self sealing but i cant seem to get coke cans to seal....how do i combat this? use 1 layer of inner tube and one coke can? i cant see anyway short of machining o o-ring grove in there...
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Unread postAuthor: potatoflinger » Sat Aug 18, 2007 9:53 am

Maybe you could cut your own o-ring out of an inner tube, and make it the size of your union, so that it fits in the union.
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Unread postAuthor: noname » Sat Aug 18, 2007 11:25 am

The make gaskets that are meant to be put in metal unions, because they don't seal on their own. The gaskets are usually in little packages labeled "3/4" union gasket." They're also really cheap, just get one of those, and if you can't find one, just make one yourself out of sheet rubber.
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Unread postAuthor: hi » Sat Aug 18, 2007 1:37 pm

i had that problem with mine, i just took a pipe wrench to it and that got it to shut up and quit whinnning. :lol:
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Unread postAuthor: SpudBlaster15 » Sat Aug 18, 2007 1:39 pm

A 1/16" thick, 1 5/16" diameter o-ring makes a perfect gasket for 3/4" unions.
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Unread postAuthor: spanerman » Sat Aug 18, 2007 1:46 pm

ok quick question.......are all sealing faces on unions taperd.....
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Unread postAuthor: SpudBlaster15 » Sat Aug 18, 2007 2:09 pm

Most steel unions have tapered sealing faces, but I have seen a couple that do not.
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Unread postAuthor: spanerman » Sat Aug 18, 2007 2:11 pm

ok thanks...i made a rubber gasket seals perfect:)
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