A Pressure Regulating Valve (PRV) helps protect your plumbing by keeping your home’s water pressure at a safe, steady level.
Many plumbing fixtures and appliances are designed to operate at 60–80 psi. However, city water pressure can sometimes exceed 100 psi, especially in homes at higher elevations or farther from water sources. Over time, this excess pressure can damage pipes, fixtures, and appliances.
A PRV reduces incoming water pressure before it enters your home, helping prevent leaks, appliance failures, and other plumbing issues.
Where is a PRV located?
A PRV is typically:
Bell-shaped
Installed on the main water supply line
Located near the main shutoff valve, where water enters your home
Why high water pressure is a problem
High water pressure puts constant stress on your plumbing system and can lead to:
Pipe leaks
Increased wear on pipe joints
Higher risk of pinhole leaks
More severe water hammer when faucets shut off suddenly
Water heater damage
Excess pressure can overfill the tank
Heated water expands with nowhere to go
Can result in leaks or tank failure
Appliance wear and failure
Washing machines, dishwashers, and ice makers are typically rated for pressures up to 80 psi
High pressure can damage inlet hoses, leading to floods
Toilet and fixture issues
Faster wear on fill valves and flappers
Increased water waste from constant refilling
How do I know if I have a PRV?
If you know where your main water shutoff valve is located, look nearby for a bell-shaped valve on the incoming water line. That is usually the PRV.
Will Phyn work if I don’t have a PRV?
Yes, but with some limitations.
If your home does not have a PRV:
You can still monitor water pressure in real time
You can run manual Plumbing Checks
Phyn may take longer to learn your home’s water patterns
You may receive more frequent false alerts during the learning period
Fixture-level water usage accuracy may be reduced
Providing feedback in the app (by labeling alerts) will help Phyn improve faster.
Why does Phyn work better with a PRV?
PRVs help stabilize pressure and reduce background “noise” in your plumbing system. This makes it easier for Phyn to clearly detect when water starts and stops flowing, improving:
Leak detection accuracy
Fixture recognition
Alert reliability
In short, Phyn “hears” better when pressure is steady.
How much does a PRV cost?
PRVs typically cost $50 or more, depending on the model
Professional installation usually takes a few hours
Installation costs vary by plumber and location
Installing a PRV is recommended not just for Phyn performance, but as a general step to reduce leak risk and extend the life of your plumbing system.