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Old 09-15-2020, 08:52 PM   #1
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Hot water supply valves failing after use


Curious problem I've been running into... I'm a little over a year into my new house, built in '64. I've been replacing some old faucets just to get an upgrade, and the hot water supply valves have been nearly frozen. I usually have to get a wrench on them to get them closed, and when I do they don't seal great. After doing the work and turning the valves back back on I get a bunch of rubber pieces through the hot side. I usually have to work the valve a little to end up getting it all out, then I get nice, clean water again.

Any ideas on why just the hot sides are failing like this? Cold sides are also old and a little difficult to turn, but they seal just fine and no rubber from the failed valve. I'm mostly worried that it might be indicitave of some other issues that should get my attention, or if this is usual for hot water lines.

On the same note, is it fine to just add some inline valves after the existing valves? I couldn't tell how the old valves are connected, copper lines and it seems threaded but they are very close to the wall and a little corroded... it's difficult to tell, could be sweated.
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Old 09-15-2020, 10:01 PM   #2
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Re: Hot water supply valves failing after use


The rubber pieces could be from the rubber washers.


"is it fine to just add some inline valves after the existing valves?"
- Can you rephrase this, not so clear.

You mentioned corrosion. If you have iron pipes, think about re-piping. It will cost you some money, but you'll be saying: Why did I wait this long?
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Old 09-15-2020, 10:09 PM   #3
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Pipes are copper. The seals on the flex hose were all in good shape.

I mean can I add a valve after the existing valve and before the faucet, seems easier than replacing the broken valve.
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Old 09-16-2020, 04:53 AM   #4
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Re: Hot water supply valves failing after use


The hot water probably degraded the seat washer of the stop valve. Easy to rebuild. Turn the water off, open the valve, undo the collar nut and keep turning the handle until it comes out of the valve. Note the shape and size of the washer and replace it.

Whatever you do, refrain from twisting the valve more than normal. It won't seat and you will break it. This is one from a client's house outside sillcock. They just couldn't get it to stop dripping.
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Old 09-16-2020, 08:40 AM   #5
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Re: Hot water supply valves failing after use


Please post a picture so we can see what your seeing.
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Old 09-16-2020, 09:14 AM   #6
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Not much I can get a picture of now... Valve looks fine externally, just getting a bunch of nasty rubber through the hot side after closing the valve. After running it for a few minutes it's clear again.


If it's just the hot water degrading the rubber then I won't worry about it.
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Old 09-16-2020, 10:59 AM   #7
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Re: Hot water supply valves failing after use


With all of this rubber failure i suspect the supply stop valve won't stop water flow at all now, is that correct?
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Old 09-16-2020, 03:59 PM   #8
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Re: Hot water supply valves failing after use


I recommend using the ball valve type (1/4 turn) when replacing.
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Old 09-16-2020, 04:20 PM   #9
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Re: Hot water supply valves failing after use


Correct, the valves no longer shut off once used. I am definitely getting a ball valve, these ones suck.
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Old 09-16-2020, 07:18 PM   #10
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Re: Hot water supply valves failing after use


Replace with ball valves.
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Old 09-18-2020, 01:20 PM   #11
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Re: Hot water supply valves failing after use


hot water breaks down the 00 washer in the shut off valve. The washerrs are not held in with a screw. There is a stem with a mushroom head on it. You can put some grease on the little stem and force a soft 00 washer over it. Lube the stem threads with silicone grease and reassemble. Good as new.
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