I was hearing noises when turning on faucets so I put a pressure gauge on an outdoor spigot and it reads 100 psi with no other faucets running. If I turn on the kitchen faucet the outdoor pressure drops to 50 psi. If I turn off the kitchen faucet the outdoor pressure increases back to 100 psi over a period of about 30 seconds.
Adjusting the PRV with the system closed has no effect, the outdoor pressure stays at 100 psi. Adjusting the PRV with the kitchen faucet running does change the outdoor pressure above or below the 50 psi I mentioned above.
My thermal expansion tank had failed, and replacing it seems to have eliminated the noises (I set a pre-load of 55 psi on the tank). I am still not understanding why I'm getting 100 psi with the system closed.
Does this sound like a bad PRV? It's a Watts N35B and is 14 years old.
Adjusting the PRV with the system closed has no effect, the outdoor pressure stays at 100 psi. Adjusting the PRV with the kitchen faucet running does change the outdoor pressure above or below the 50 psi I mentioned above.
My thermal expansion tank had failed, and replacing it seems to have eliminated the noises (I set a pre-load of 55 psi on the tank). I am still not understanding why I'm getting 100 psi with the system closed.
Does this sound like a bad PRV? It's a Watts N35B and is 14 years old.
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