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Author:
gmum (IL)
Is there a trick to soldering a 1/2" or 3/4" pipe on a dead end pipe without it shooting off the end of the pipe?
I have a shut off valve and about 2' of dead end pipe after it. I want to cap it but the steam is building up in that 2' and shooting it off the pipe.
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Author:
ex apprentice 28 (MA)
You could solder on a female adpt and use a lead free brass plug wrapped with Teflon tape or pipe dope and use 2 wrenches to tighten.
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Author:
srloren (CA)
You must drain the water out of the system. Drain as much as you can possibly get out. When you drain the line down and open a faucet or valve downstream, this will prevent the steam from building up and preventing you from making the joint. If you have questions ask and we will reply.
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Author:
packy (MA)
just use a sharkbite cap.
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Author:
gmum (IL)
fair enough, but I am leary of those things. Plus I thought the caps were just for testing or something rather than holding indefinitely under pressure.
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Author:
packy (MA)
i don't like them either. but, there is no more nor no less pressure on a cap than there is on an elbow or tee.
so, solder on a female adapter as suggested.
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Author:
gmum (IL)
female adapter and brass plug sounds like a plan...
Is it possible to solder to a valve that has water pressure on it in the closed position on one side?
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Author:
packy (MA)
do it all the time.. no problem...
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Author:
gmum (IL)
thanks packy and all for the great tips.
Edited 1 times.
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Author:
hj (AZ)
It is NOT "steam". It is air pressure. You hold the cap on the tubing until you get it hot. At that point the excess air should be out and you can solder the joint.
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Author:
hj (AZ)
We do it all the time, but whether YOU would have a problem with it is something we cannot answer.
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Author:
srloren (CA)
You must be able to apply enough heat on the valve to allow the solder to melt and adhere to the valve without burning up the flux on the thin copper tube. It is a matter of knowing when to remove your torch but water in the valve will cool down and make it harder to get the soldering side of the valve to the right temperature. The proper size torch is imperative if you are doing this in a wood stud wall so ALWAYS have a fire extenguisher next to you when you solder near combustibles! Buildings are destroyed every year by plumbers who refuse to be safe. Just saying.
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