I have a water pressure reducing valve at the main water supply to my house. When I put a pressure gauge on the water heater with no faucets running, I read 130 psi. When I turn on the bathroom faucet, the pressure reading drops to between 20 and 130 psi, depending on how the reducer valve screw is adjusted. However no matter what the setting, the pressure reading always climbs back to 130 psi within a minute after all water flow is turned off.
Is my PRV working correctly? Should the static pressure with nothing running be adjustable by the PRV, or is it only for limiting the pressure while water flow is active?