I'm getting really loud whine whenever I turn on a faucet at full blast. I've narrowed it down to one of the two pictured components but I can't tell which of them is causing it.
The whine doesn't start up right away but instead takes a few seconds to spin up (and increase in pitch and volume). The same goes for when we turn off the faucet; it takes about 10-15 seconds to finally die down. There is also a whole house water filter right after the PRV.
Which component is more likely to be whining given the above description, and is there anything I can do to fix it?
It was the prv. Finally got a plumber out to replace it (along with some other work) and the whine was eliminated