Why does water pressure keep creeping up with a new PRV?
Even after installing a brand new pressure reducing valve, pressure can still creep up to full utility levels when water is not flowing. This happens because debris or a bad seat inside the valve prevents it from sealing completely, which causes the house pressure to slowly match the incoming supply and can lead to vibrating or humming noises in the plumbing.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1closing the main ball valve
- 2replacing the unit with another brand new one
- 3Replacing the faulty pressure-reducing valve yourself using two wrenches and plumbing tape
- 4Checking water pressure at different hose bibs or the water heater drain
- 5Hiring a licensed plumber to inspect and replace the valve
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I replaced me old PRV with a brand new one, but the pressure is creeping up with no flow (about 0.1psi/min) all the way until it equilibrates at 75psi which is the utility pressure.”source ↗
“When I close the main ball valve the pressure creep stops immediately.”source ↗
Where this came up
People with this problem also raised
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- 76How to fix a leaking water pipe in a tight space
- 4Low hot water pressure at only one faucet
- 2Dishwasher not getting water after plumbing work
- 3Why does my basement sink gurgle when the kitchen sink drains?