We have been experiencing an odd rapid beat water hammer in this house for the past 3 years when the main feed water pressure increases and everything is shut off from flowing.
I have had several plumbing experts look at the system and none could come up with an answer.
Last week, the water company changed out our meter and it happened when the guy doing it was here. He said it’s the check valve just after the meter is hanging up when opening and then slamming shut repeatedly when the pressure increases. Sounds like someone playing a rapid beat on the drums.
Today I took apart the check valve and is was definitely hanging up. Cleaned it all up and replaced the o-rings. One was distorted over the seal plunger.
All quiet now. :)
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