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flush fill valve
Posted by: Fritz
Date: September 12, 2020 10:53AM
had a slow filling toilet that is now running constantly.
It's not the flapper.
Took the cap off and blasted it.
The valve assy isn't yet 5 yrs old, not nasty looking in any way.

before I go hit Lowes for a new valve. do I have it right that the float rises and closes a "switch" in the cap or the rubber disc?
Just don't understand why these things fail so frequently other than the "subscription" business model.



!#$@@$#!

If there are spelling issues, please pardon, Owen the cat is sitting on my keyboard.
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Re: flush fill valve
Posted by: pqrst
Date: September 12, 2020 11:23AM
Check that the flap seal is tight by removing the chain from the arm. If it takes care or problem, reattach to arm
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Re: flush fill valve
Posted by: rgG
Date: September 12, 2020 01:32PM



[www.acehardware.com]

If it is this kind, you can just replace the top.





Roswell, GA (Atlanta suburb)
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Re: flush fill valve
Posted by: Fritz
Date: September 12, 2020 01:51PM
it's a fluidmaster 400, same, same.
but what fails in the top, just curious, if anyone nose.



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If there are spelling issues, please pardon, Owen the cat is sitting on my keyboard.
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Re: flush fill valve
Posted by: macphanatic
Date: September 12, 2020 02:18PM
Issue is probably due to minerals/crap in the water.
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Re: flush fill valve
Posted by: GGD
Date: September 12, 2020 03:18PM
Quote
Fritz
it's a fluidmaster 400, same, same.
but what fails in the top, just curious, if anyone nose.

There's a rubber diaphragm under that black cap, they even sell those separately as repair parts for about $3 but I always just buy a new flush valve for about $7 and swap the entire upper assembly, leaving the bottom pipe unchanged, total labor time is under 5 minutes.

I've looked at the diaphragm from some failed ones and didn't see any visible clues about what caused it to fail, my guess is that it might lose it's "springiness" over time.

As long as the float hasn't sprung a leak, and the float and valve arm can move freely, then the diaphragm seems like the only thing that can fail on it.
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Re: flush fill valve
Posted by: rgG
Date: September 12, 2020 03:29PM
Quote
Fritz
it's a fluidmaster 400, same, same.
but what fails in the top, just curious, if anyone nose.

It appears to be the little rubber diaphragm that craps out.
I got tired of replacing the cap of mine and switched to a Korky valve with a different design.





Roswell, GA (Atlanta suburb)
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Re: flush fill valve
Posted by: Fritz
Date: September 12, 2020 03:51PM
I figured it was the rubber diaphragm. Perhaps it gets leaky.

I don't mind the 5 yrs. I'd look at Korky I suppose.
Does seem the shortest solution is as GGD said.



!#$@@$#!

If there are spelling issues, please pardon, Owen the cat is sitting on my keyboard.
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