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Posted by Ike on March 15, 2007, 7:10 pm
>On Thu, 15 Mar 2007 10:17:31 -0700, Ike wrote:
>
>> For the past 3-4 years, we have heard an intermittent
>> humming/vibration sound in our house. The sound is loudest in the
>> master bedroom (of course) and eminates from the wall on my side of
>> the bed. The sound is loud enough to hear in most parts of the house.
>> I have gone to great lengths to find out what is causing this sound.
>> This past weekend while replacing the auto-fill valve on our pool I
>> finally discovered how to make the sound stop.
>>
>> In order to replace the valve I had to turn off the water supply. As
>> soon as I turned the valve, the humming stopped. After replacing the
>> auto-fill with a new one and turning the water supply, the humming
>> returned. Turning off the auto-fill every night so I can sleep is not
>> a solution.
>>
>> There is a back flow preventer valve on the auto-fill line.
>> Considering the auto-fill valve itself is new, I no longer suspect it
>> as the cause of the humming. So now I suspect it is the back flow
>> preventer valve for lack of a better answer. Has anyone ever heard of
>> these valves making noise? What would be in their design that would
>> cause this?
>
>
>That is a form of 'watter hammer.' Install a water hammer arrestor near
>that valve. Its not a faulty valve necessarily. Its kind of like your
>water pipes are out of 'tune'. What you hear is a harmonic vibration just
>like a wind instrument. You can change the sound of a wind instrument
>by opening and closing the path the wind can escape. A water hammer
>arrestor kind of does the same thing. This can occur when you change the
>structure of your piping by adding on some new pipes. Such as a pool, or
>extra bathroom, etc. If it was there during initial construction, they
>should have installed some arrestors already.
>
>It can be somewhat bad for your pipes too as they are not designed to
>sustain vibration like that indefinitely.
I am familiar with water hammer because we use to have a house that
had the problem. In this case the noise only happens when there is NO
water flow. When the swimming pool auto-fill kicks in, the noise
disappears.
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