I've been hearing water hammer that I thought was the washing machine turning
off and rattling the pipes, but when I'd go into the basement and watch, it
never hammered. This morning I woke up to the well cycling. Investigation
showed the pressure was leaking back down the supply pipe. I replaced the
Flowmatic check valve with a $16 American Granby (the Nibco was $65).
Now when the pump kicks on there is a significant hammer, about 1/2 second
after the switch triggers the pump. The check valve spring was pretty light so
it isn't that.
Any ideas on what's going on here? I'm wondering if something is wrong that
killed the check valve. It looked original, 30 years old, spring had come
undone and gotten stuck in the valve.
thanks,
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