The sounds occurs toward the end.
(I was able to listen to the sound clip sent by Jim, but am not
able to post on this website, but I can hear something rattling around
inside the pipe)
OK Jim This is not a bouncing noise, I assumed it was the typical
noise a zone valve makes when closing,
There is definitely a piece of something in the pipe. I would remove
the plate to the zone valve and flush it out. something is in there.
Yeah that's what my plumber was thinking also. He did, as I said,
replace the larger valve head and ball piece behind it. There was some
stuff that looked like pipe dope on the ball. Which I believe was from
when he moved a baseboard radiator for me the same day he did the zone
valves. However he never did this for the basement zone valve which is
the one you heard making that noise when I manually open it. I suspect
that maybe the issue or perhaps some solder from when it was sweated in.
That's why he wants to cut the whole valve out. In case it's a piece of
solder. I do get a whining sound from the circulator when it's running
but this was there before the zone valve replacement. I just assumed
this is a normal sound but maybe it indicates a pump that's going? I'm
thinking it may be best to have the valves changed and purge the pipe to
insure nothing is in there and replace the circulator while the system
is drained down also to be safe. What do you think?
I can't thank you enough for your expert help. As you can see I
have been dealing with this issue back and forth for several months now.
My plumber is great and is a licensed plumber for some 30 years like
yourself but he is clueless about this one. Having said that I think he
does more plumbing than repair work.