A pressure reducing valve (PRV) lowers incoming water pressure from the main line to a safe level before it enters a building. Excess pressure can damage fixtures, appliances, and pipes, leading to leaks and premature failure. By regulating pressure—typically to 40–60 psi—a PRV protects the system and improves water efficiency.
/ˈprɛʃər rɪˈdjuːsɪŋ ˈvælv/
A pressure reducing valve (PRV) lowers incoming water pressure from the main line to a safe level before it enters a building. Excess pressure can damage fixtures, appliances, and pipes, leading to leaks and premature failure. By regulating pressure—typically to 40–60 psi—a PRV protects the system and improves water efficiency.
Why do I need a pressure reducing valve?
It protects your plumbing by lowering high incoming pressure to a safe, stable level.
Source: The Cooling Company
PRVs regulate high pressure to protect plumbing systems.
After repeated leaks and running toilets, a homeowner installs a PRV to stabilize pressure and protect fixtures.
Check your home’s water pressure periodically; sudden changes can mean the PRV needs adjustment or replacement.
“Check your home’s water pressure periodically; sudden changes can mean the PRV needs adjustment or replacement.”
Pressure reducing valves became common as city water systems increased pressure to reach growing urban populations.
Can a PRV fail over time?
Yes. Internal parts can wear out, causing pressure creep or fluctuations.
Does a PRV reduce water flow?
It reduces pressure, not necessarily flow, but undersized valves can restrict flow.
Should I add an expansion tank?
Often yes, especially in closed systems where pressure increases with heating.
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