A PRV protects fixtures and appliances, and it also makes the home a closed system, which is why homes with a PRV need an expansion tank at the water heater. PRVs wear out over time and can creep upward.
Pressure-Reducing Valve (PRV)
A pressure-reducing valve sits where the water main enters the home and lowers street pressure to a safe household level, typically set between 50 and 70 psi.
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