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Tool Talk Discussion Forum

Re: Problem with 3/4 copper unions

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Ken Macfarlane

11-30-2012 04:57:31

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The threads on a union don't hold in the pressure, they just draw the mating surfaces together. Don't put paste or tape on them. You can lube the threads to make it easier to tighten.

Open up the union, see if there are burrs on the bell or boot (right terms? the convex and concave mating surfaces). They also can't have misalignment. You need to crank them down tight for air service.

In my old shop I replaced them with straight couplers. No leaks after that, could leave the compressor valve open.

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Brian G. NY

11-30-2012 08:43:29

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 Re: Problem with 3/4 copper unions in reply to Ken Macfarlane, 11-30-2012 04:57:31  
Ken is correct.......I have noticed that the China made plumbing "fittings" just don"t "fit" like the old USA fittings.

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11-30-2012 11:06:23

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 Re: Problem with 3/4 copper unions in reply to Brian G. NY, 11-30-2012 08:43:29  
To Mike,
I should have used connectors in the beginning. Everyone of the unions leaked. I'm now in process of cutting them out. Thanks

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