Humming faucets

I remodeled a bathroom a year ago. Recently the faucets started humming, somewhat loudly, as you turn them on or off (very low volume). This is a price pfister faucet, IIRC, with an internal rubber seal about 1/4" in diameter by 1/4" long. Any ideas on fixing this?
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wrote:

Do you have a Water Pressure Reducing Valve -- adjust it?
http://www.plumbersurplus.com/images/prod/6/Watts-25AUB-Z3-rw-5731-3809.jpg
I don't hear good things about that brand.
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No reducing valve. Water pressure is about 70 psi.
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wrote:

You could try adjusting the angle stop, just a little bit.
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Yes. Closing the under-sink valve a bit virtually eliminates the noise. Thanks everyone.
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wrote:

Inspect in a day or so. Sometimes tampering with the valve might cause a leak. It's suggested too never have the angle stop valve at full on, but to turn it down a bit. After any repairs.
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washers tight?

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Have you replaced the cartridge as they are under lifetime warranty, any difference if shower or tub spout in the amount of noise. As someone else suggested try to open and close your shutoffs a bit.
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re: It's suggested too never have the angle stop valve at full on
Actually, it's suggested to never have any valve, other than in-line lever valves, full on.
With any valve that you have to turn to operate, it is always best to leave it about 1/4 turn "off". Should the valve and/or stem freeze up, you want to have a some room in both directions to unfreeze it. If it's cranked full open, you may never get closed, which could be a problem in an emergency.
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