Disassemble valve before sweating it?

Old 07-26-00, 09:59 AM
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I soldered a new brass stop valve to 3/4 copper pipe and now the new valve has a pinpoint leak at the 2 inch diameter seam where you access the washer for replacement. Not at the stem nut.

I DID have the valve in the open position when sweating it. I did NOT protect any part of the valve or stem with a heat sink while soldering, ya know, like a wet rag wrapped around the stem.

Should I have disassembled the valve stem from the valve BEFORE I soldered it?

Why is it leaking at this threaded seam? I could understand if the stem nut leaked due to overheated packing, but I don't think there is anything at this seam that can be ruined by soldering. It is just a brass threaded top of the valve body.

Old 07-26-00, 03:07 PM
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The valve could have been defective, if you can get the entire valve apart without breaking the pipes and get a valve like it, just replace the guts, if not, time to redo it.

Best Regards Plumber2000
Old 07-27-00, 10:31 AM
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I'll take that as good advice and plan on replacing the valve. Thanks for the extra point of view.


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