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 cut off valve removal
Author: enobarb (NJ)

I want to change my leaking shut off valve under my sink. I can't get the old one off the 1/2 copper supply line. I don't think it's soldiered connection. Using two wrenches, I can get the value to move counter clockwise but NOT COME OFF the supply pipe. I'm afraid to use too much elbow grease because I fear I might break the 1/2 supply pipe.

Can anyone advise me? Thanks.

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 Re: cut off valve removal
Author: dcplumber (CA)

It sounds like it is a compression sleeve fitting. Turn off your water supply and using two wrenches. turn the angle stop valve counter clockwise to remove it. Now you can just thread in the new valve and tighten it. Some people try to remove the ferrel/compression sleeve and nut with a compression sleeve puller. That is up to you. If it is in a cabinet and hidden I would probably just leave it. If it is visible then you may want to change it.

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 Re: cut off valve removal
Author: enobarb (NJ)

OK. I'll give that a try. Thanks.

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 Re: cut off valve removal
Author: dlh (TX)

i only change them when the old one has been tightened to much and thus wont let a new valve seal

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 Re: cut off valve removal
Author: enobarb (NJ)

I assume you mean one wrench to hold the 1/2 inch supply line in place while the other turns the valve counterclockwise?

I've tried that but no go. Maybe I'm not keeping the 1/2 supply line firmly in place because I'm afraid the wrench will bend or break it.

Can I really hold that 1/2 in place forcibly while I turn the valve counterclockwise? Should I use channellocks? An adjustable wrench? A monkey wrench?

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 Re: cut off valve removal
Author: dcplumber (CA)

At this point you should hire a licensed plumber.

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 Re: cut off valve removal
Author: hj (AZ)

Or the old one has a "coarse thread" nut which will not work on the new valves.

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 Re: cut off valve removal
Author: hj (AZ)

DO NOT rotate the valve in ANY direction. Hold the valve and loosen the nut IN THE RIGHT DIRECTION. It can be very tight sometimes, but if it is a compression connection it WILL loosen.



Edited 1 times.

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 Re: cut off valve removal
Author: enobarb (NJ)

HJ

When you say "in the RIGHT DIRECTION" do you mean CLOCKWISE?

THANKS

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 Re: cut off valve removal
Author: hj (AZ)

The nut will go "clockwise" from your orientation, but from the backside it will unscrew CCW, just like ALL right hand threads. This is one of those things that unless you/we understand HOW you are looking at it, it could be described either way.

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 Re: cut off valve removal
Author: enobarb (NJ)

Thanks, hj, I took your advice and have installed the new valves. But another problem has surfaced.

The water pressure is all of a sudden really low but only in the sink where I replaced the valves. I thought maybe I had put the new compression bolts on too tightly, so I loosened them a bit. Still the pressure was terrible. There's hardly any water at all coming from the hot or cold.

Any advice?

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 Re: cut off valve removal
Author: hj (AZ)

If the flow is constant, and does not change regardless of whether you open either one, or both valves, then the problem is in the faucet AFTER the point where hot and cold merge, which is usually in the aerator on the end of the faucet's spout. Remove it and see if the problem goes away.

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