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BillBo
Water hammer after installing new shower faucet
BillBo

We purchased a new, but off-brand (made in China) shower faucet, and had it installed by a plumber. Now we hear a water hammer noise near the new valve every time we open or close the new faucet or any other faucet in the house. The plumber came back to check it, and said they think it is the new faucet valve. We obtained and installed a new cartridge, but the noise remains. The hot and cold copper supply lines are secured to the wall framing, and each side has vertical piping installed as air-filled buffers. I've tried draining the lines to "recharge" the air buffers, but that didn't help. Is it possible that the valve could be making this noise? Should I try installing hammer arrestors or just replace the valve? I can't imaging that it matters, but the plumber also installed a new main shutoff valve to the house. Any help is appreciated.

bill
Re: Water hammer after installing new shower faucet
bill

You can try installing water hammer arrestors. Install them on every fixture and at the end of line is possible. also try recharging all your air buffers again, shut off the main and open every faucet or device. do not forget to open the lines going to electric valves ie clothes washers dish washers. Then shut every thing and open main shut off very slowly

Bill

Mastercarpentry
Re: Water hammer after installing new shower faucet
Mastercarpentry

I've seen this happen when replacing old multi-turn faucets with 1/4 turn or short-throw lever models which stop the water flow more abruptly than before. Unfortunately the air buffers of water-hammer arresters are not the right fix though they often work. Hammer is from something moving in a way it should not be doing but getting to that once the walls and floors are finished is just too much. With what you've got, if there is a faucet access panel on the back (or if you can create one) then I'd try hammer arrestors in there as the most likely thing to reduce the problem the most. While in there look for loose piping or a loose faucet mounting. Sometimes you can help a loose pipe by shimming it to one side with styrofoam- make it taught, don't cram it in super-tight. And if that doesn't work get used to turning that faucet off slowly.

Phil

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