Replace Bathroom Shut off Valve

[Dmwesq]

Looking for some advice for replacing shut off valve under bathroom sink.

I started this because there is some build up on my faucet - according to Delta it is calcium build up, but whatever it is it isn't coming off using the 50-50 white vinegar and water solution recommended by Delta. But to fully take things apart I need to turn off the valve, and the cold turns fine but the hot barely budges. So that is the first thing I need to figure out.

Second, whether I keep the current faucet or replace it, I want to deal with the valves as well. I suppose I could just replace the stem inside the valve, but I am also considering trying to replace the valves themselves with quarter turn valves. If I try to replace the valves, do I use a push to connect valve or a regular type fitting?

 

[Reach4]

Are the threads/pipe coming out of the wall 0.675 or 0.84 inch OD max? Is that nipple coming out of the wall steel (magnetic) or brass?

Or is it maybe 0.625 inch or 0.50 OD copper into a compression valve?

 

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[Dmwesq]

As a follow up, I have both handles off the faucet and I'm not sure that Delta's assessment of calcium build up is correct. Looks like some sort of corrosion to me, but I could be wrong.

 

[Dmwesq]

Are the threads/pipe coming out of the wall 0.675 or 0.84 inch OD max? Is that nipple coming out of the wall steel (magnetic) or brass?

Or is it maybe 0.625 inch or 0.50 OD copper into a compression valve?

Not quite sure how to measure this, but here is a better angle to see

 

[Dmwesq]

And I'm totally stuck. I can't turn either stem to pull them out and I don't want to exert too much pressure since the stem is plastic. I also can't separate the nut from the valve to take that off - don't know if I have to try to apply some heat to loosen it - and frankly not sure how comfortable I am working with a torch - hate to give up and call a plumber on Monday but not sure how much more I can do here.

 

[Reach4]

Not quite sure how to measure this, but here is a better angle to see

Copper pipe. Compression valve.

To measure, either get a digital caliper, or a string. With the string, run the string around the pipe, and mark, with a Sharpie, where it meets the other end. Stretch out the string. Measure (that would be the circumference), and divide by 3.14 (pi). Expect either 1.57 or 1.96 inches. That would be 3/8 or 1/2 inch pipe respectively.

To replace a compression valve, you can often unscrew the back nut, leave the ferrule in place, and screw the new valve on using the old nut. Alternatively use a ferrule puller, and use the new nut and ferrule that comes with the valve. If you replace the nut, might as well replace the escutcheon at the same time.

If you will try any of these, you can find prior posts that have terms like "ferrule puller" etc.

 

[Dmwesq]

0.625 is the outer dimension of the copper pipe

 

[Dmwesq]

Copper pipe. Compression valve.

To measure, either get a digital caliper, or a string. With the string, run the string around the pipe, and mark, with a Sharpie, where it meets the other end. Stretch out the string. Measure (that would be the circumference), and divide by 3.14 (pi). Expect either 1.57 or 1.96 inches. That would be 3/8 or 1/2 inch pipe respectively.

To replace a compression valve, you can often unscrew the back nut, leave the ferrule in place, and screw the new valve on using the old nut. Alternatively use a ferrule puller, and use the new nut and ferrule that comes with the valve. If you replace the nut, might as well replace the escutcheon at the same time.

If you will try any of these, you can find prior posts that have terms like "ferrule puller" etc.

I have a ferrule puller. That back nut isn't budging though - so that's a bit of a problem. I just put some more WD-40 on it and will try again in a little while.

 

[Reach4]

To budge, use two longer open-end wrenches. Do not torque the pipe itself. Remember when loosening the back nut, it will look like clockwise to you.

something like https://www.homedepot.com/p/BrassCr...let-1-4-Turn-Angle-Valve-G2CR19X-C1/202047059

or Dahl 611-33-31 https://www.dahlvalve.com/products/mini-ball-valves/supply-stops/copper/supply-stops-611-33-31.php

 

[Dmwesq]

To budge, use two longer open-end wrenches. Do not torque the pipe itself. Remember when loosening the back nut, it will look like clockwise to you.

something like https://www.homedepot.com/p/BrassCr...let-1-4-Turn-Angle-Valve-G2CR19X-C1/202047059

or Dahl 611-33-31 https://www.dahlvalve.com/products/mini-ball-valves/supply-stops/copper/supply-stops-611-33-31.php

Thanks for all your help. I was happy to get the stem out and a new one in for now. I bought a much needed wrench, all the valves for my house, and will tackle the full replacements another day. I'm sure once I get through one the rest shouldn't be too difficult.