Upstairs Bathroom Water Hammer
I have recently attemped to replace my old ballcock fill valve on the toilet in my upstairs bathroom that was old and leaking loudly into the tank from the top of the valve. Initially I turned the toilet supply water pressure down after I noticed drips from the side of the tank (the water pressure going through the leaking valve was going up, hitting the inside of the top of the tank lid, and dripping down the outside of the tank) until I could get a new fill valve. I purchased and installed a Korky "quiet fill" valve, and the fill noise and leak problem was fixed, only to be replaced by a loud water hammering at the end of each fill cycle when the valve shut off. I even tried to lower the supply pressure, but that caused: 1. a loud fill cycle (The lower the pressure, the louder the fill), 2. longer fill time, and 3. It still didn't fix the hammering problem. I also started noticing the same hammering when the sink faucet is shut off quickly.
I have since temporarily put back in the old ball cock fill valve (at reduced pressure) and am suffering through loud fill cycles.
My question is:should I be leaning more toward installing a water hammer arrestor (And if so, where do I install it? By the toilet, or downstairs at the source pipe?) or calling a plumber to check to see if the pipes in the wall are properly mounted? Any sugestions would be greatly appreciated.
This may or may not help you, but it's worth a shot. I had a very bad hammer that would vibrate the pipes for a good 10 seconds, while the toilet was filling. I resolved it by shutting of my water supply and draining the system. Turned supply back on, let the pipes fill back up, and the problem was gone. I understand the whole thing about the possibility of air trapped in a section of pipe, but I'm still surprised my solution worked. A year later, it's going strong.
As far as installing a hammer arrester - go for it, they're pretty inexpensive.
Also, have you checked your supply pressure? You can pick up a pressure guage that installs on an outside hose bib. The big box stores carry them for about $8. Your pressure should be between 60-80psi. Any higher can cause problems. If you're higher, you may have an old Pressure Regulating Valve or not have one at all. I think they run about $80.
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