I am installing compression stop valves to copper pipe. They seem to require
a high level of torque to prevent leakage. Is this normal? I cleaned the
copper with emery and then removed the debris.
Would it help if I used some PTFE tape on the copper? If not, are there any
other techniques I should use.
Don't use tape.
However, I have found that they seal better and
are much much easier to tighten if you apply a
little Teflon paste pipe dope to the compression ring.
Don't clean the pipe; as noted, that will leave scratches.
When I first bought my house, I used compression fittings because I was
afraid to sweat copper. Then I got so frustrated at compression
fittings that leaked and all the trouble I had to go through to make
them work that I knew it was time for a change. I bought a bunch of
copper and fittings, all the stuff needed to sweat copper and spent a
little time at the workbench learning to sweat.
Once I realized how easy it was, I never used another compression
fitting. I also tackled jobs I had avoided (like running hot water out
to the garage) since swaeting is so much easier and cheaper.
Do yourself a favor, buy a bunch of fittings and pipe and teach
youeself to sweat in a no-pressure environment - at the bench.
Practice seems to be best. BTW I have found that it is easy to over
tighten the fittings. I would rather they be not tight enough than too
tight. If not tight enough, I can snug them up, but if too tight, then It
means replacing parts.
Skip the emery, and don't use teflon or other tape.
The hint is to soak the fitting with penetrating oil before
tightening. That makes the nut twist a lot better, and the
ferrule slips into shape easier.
Christopher A. Young
You can\'t shout down a troll.
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