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Fix a pressure reducing valve that will not regulate

We'll check pressure, adjust the PRV, and tell you when to call a plumber.

Troubleshooting · Home plumbing
15–30 min
What you'll need
  • Pressure gauge (optional)
  • Adjustable wrench
Step 1 of 4

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Steps

Goal: Check pressure, adjust the PRV, and restore proper regulation.

  • Check pressure with a gauge. Typical target is 50–60 psi.
  • Turn the PRV adjustment screw—clockwise to increase, counterclockwise to decrease.
  • Good: Pressure in range. Bad: No response—call a plumber.

Adjust PRV

Goal: Set the outlet pressure to the target range.

  • Make small turns (quarter turn at a time). Recheck with a gauge.
  • Good: Pressure at 50–60 psi. Bad: No change—call a plumber.

When to get help

Call a plumber if:

  • Adjustment has no effect on pressure.
  • The valve leaks.
  • The PRV needs replacement.

Verification

  • Pressure is 50–60 psi at a hose bib or fixture.
  • No leaks at the PRV.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Check pressure Use a gauge to see current pressure.
  2. Adjust PRV Turn the adjustment screw to change pressure.
  3. Check for leaks Verify the PRV is not leaking.
  4. Call a plumber No adjustment response, valve leaks, or replacement needed—call a plumber.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Current pressure reading
  • Adjustment response
  • Leak condition
  • Steps already tried

Is the pressure too high, too low, or fluctuating?

PRVs regulate pressure. Typical target is 50–60 psi.

Check pressure with a gauge. Too high: turn adjustment screw counterclockwise. Too low: turn clockwise. Fluctuating: valve may be failing—try adjustment first, then replace if no change.

High or low Fluctuating

You can change your answer later.

Did adjustment change the pressure?

Turn the screw on top of the PRV. Small turns, then recheck.

Turn the PRV adjustment screw. Clockwise increases pressure, counterclockwise decreases. Make small turns. Recheck with a gauge. Good: pressure changed—set to 50–60 psi. Bad: no change—valve may have failed; call a plumber.

Yes No

You can change your answer later.

Pressure is regulated

Pressure is now in the target range (50–60 psi). If the valve is very old, consider replacement soon.

Done

Call a plumber

Call a plumber if: adjustment has no effect, the valve leaks, or the PRV needs replacement. PRV replacement requires working on the main line.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a pressure reducing valve fail to regulate?
Common causes: a failed diaphragm or spring inside the valve, mineral buildup, or age. PRVs typically last 10–15 years. If adjustment has no effect, the valve may need replacement.
Can I adjust a PRV myself?
Yes. You can turn the adjustment screw to change the outlet pressure. Shut off the main supply before adjusting. Use a pressure gauge to verify. If adjustment has no effect or the valve leaks, call a plumber.
When should I call a plumber for a PRV?
Call a plumber if: adjustment has no effect, the valve leaks, or you need to replace the PRV. Replacement requires shutting off the main and cutting/repairing the pipe—a plumber can do this safely.

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