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Old 11-16-2011, 05:27 PM   #1
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Replace sink shutoff valves? Compression?


I need to replace the two brass colored corroded shutoff valves. Assuming these are compression fitted on to CPVC, what is the replacement procedure?

Unwrench the valve, cut the compression ring off and then install the new one?

Can I use the brass compression ring that comes with the valve to install the new one? I think it's standard CPVC pipe, 3/4" OD?

Thanks.....

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Old 11-16-2011, 08:29 PM   #2
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Replace sink shutoff valves? Compression?


I guess what I really want to know is-

1. Can I use the brass compression ring on the 1/2 in CPVC?
2. Can I refit the new valve over the same piece of CPVC the previous valve was on or do I have to seat it on a fresh piece, therefore requiring me to cut the length of the pipe sticking out of the wall. I'm not sure this is even possible because the current valves sit almost flush to the drywall.

Thanks for the help.

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Old 11-17-2011, 07:53 AM   #3
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Replace sink shutoff valves? Compression?


bump??
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Old 11-17-2011, 08:21 AM   #4
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Replace sink shutoff valves? Compression?


Sorry this has sat for a while----

Use the old nut and washer if you can----

Do not use the brass ring if you must change the nut---you need a tapered nylon ring for that--
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Old 11-17-2011, 09:13 AM   #5
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Replace sink shutoff valves? Compression?


On old CPVC I would much rather see a glued on male adapter threaded into a valve, rather than compression forces on old pipe that may be brittle and prone to cracking.
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Old 11-17-2011, 09:31 AM   #6
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Replace sink shutoff valves? Compression?


Quote:
Originally Posted by Alan View Post
On old CPVC I would much rather see a glued on male adapter threaded into a valve, rather than compression forces on old pipe that may be brittle and prone to cracking.
Good tip, but how does this 'look'?

These are going to be exposed valves.

How do you trim this out so it looks good?

Last edited by noone; 11-17-2011 at 09:34 AM.
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Old 11-17-2011, 09:35 AM   #7
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Replace sink shutoff valves? Compression?


when you thread the new valve into the male adapter, should you use pvc tape or pipe dope on the threads?
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Old 11-17-2011, 02:31 PM   #8
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Replace sink shutoff valves? Compression?


another bump.

"when you thread the new valve into the male adapter, should you use pvc tape or pipe dope on the threads? "

I really need to know how to do this right and could use some advice from some plumbing professionals out here....

I don't want to come home to a flooded house.

Thanks!
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Old 11-17-2011, 06:14 PM   #9
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Replace sink shutoff valves? Compression?


If you use a compression valve --no dope or tape---those threads don't hold water--only pulls the nut and valve together --the nylon ring does the sealing.--Mike---
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Old 11-17-2011, 06:46 PM   #10
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Replace sink shutoff valves? Compression?


Mike, I think this last question was asking about threading a FIP valve onto a MIP adapter that had been glued onto the pipe stub. If you do this use either teflon tape or dope. I prefer the tape myself. Also, if you get one of those "micro leaks" where you have a drop every half hour or so from the threads don't worry too much. It'll usually stop in a few days as minerals get deposited.

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