3. Symptom: The flow rate at all of the fixtures has diminished over time.
Likely cause: Debris in the system can build up and slowly clog plumbing components. This can occur when the system is commissioned due to debris in piping that migrates into the PRV. Clogging can also occur after service work on municipal water mains or following a large water drawdown in a well. Debris from corroded piping can also get carried into the screen of the PRV.
Corrective action: If all of the fixtures in the system are experiencing reduced flow, a good place to start is as close to the water meter as possible. Turn off the main water supply isolation valve. Next, remove the cartridge assembly from the PRV and clean it using an old toothbrush and detergent.
Be sure to clean the disc and valve seat, as well as the screen. Reinstall the clean cartridge and open the water main valve. If the system flow returns to normal, no further action is needed. If the flow rate is still diminished, check for debris in any downstream components containing screens or filters.
If the clogging persists, consider adding a wye strainer, rated for domestic water service, upstream of the PRV to reduce the need to disassemble the PRV for cleaning.