I shut off the water supply valve to my toilet to replace the flush tank
valve. On reopening the water supply valve I hear a loud hammering noise.
Can someone please provide me with information on how to fix it?
That is pretty unusual for just turning off the water at the toilet. Open
all the faucets at once and let them run for a minute or two. If that
doesn't work, turn off the water at the meter and then open them all and do
it again, turning them off in order, from closest to the supply to
Try opening the valve all the way (if you didn't).
The type of stop (valve) commonly used must be fully open
or the washer will "flap in the breeze" of the water flow
and cause horrendous chatter.
If fully opening the stop doesn't cure it, the stop will have to
be taken apart or replaced. Most likely the washer inside has
come off the stem or the bibb screw has backed out.
The cheapie stops which are most common today have the washer
only loosely pressed on the end of the stem.
If you have to take it apart, the Main shutoff valve will need
to be closed *AND* the system drained of water to prevent flooding
when you take it apart.
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