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How Do I Adjust Pressure Reducing Valve

Time: 29-July 2025 | Source: I-FLOW| Share

Tools You May Need

  • Wrench or screwdriver (depending on valve type)
  • Pressure gauge (before and after the valve)
  • Personal protective equipment (gloves, safety glasses)
  • Manual or spec sheet (optional, but helpful)

Step-by-Step Instructions

1. Locate the Adjustment Screw or Bolt
Most PRVs have an adjustment screw or nut on the top or side, often protected by a cap. Removing this cap reveals the adjustment point.
Turn clockwise (→): Increases downstream pressure
Turn counterclockwise (←): Decreases downstream pressure
Tip: Do not make large adjustments all at once. Turn the screw or bolt in small increments (¼ to ½ turn) and monitor pressure after each adjustment.
2. Check Current Pressure
Use a pressure gauge downstream of the valve to see the current output pressure. If your system doesn't already have gauges installed, temporarily install one for accurate adjustment.
3. Make Small Adjustments
Turn the adjustment screw slowly:
Clockwise to raise the downstream pressure
Counterclockwise to lower it
Wait a few moments after each adjustment to allow the pressure to stabilize before checking the gauge again.
4. Test the System Under Normal Conditions
Run the system under typical operating flow. Pressure can change depending on flow rate, so make sure you're testing it under normal demand (e.g., multiple fixtures open in a plumbing system).
5. Lock the Adjustment and Replace Cap
Once you've set the desired pressure:
Lock the adjustment screw (some valves have a locking nut)
Replace any protective cap or cover

Safety Tips

Never exceed the pressure rating of the valve or downstream components.
If you're unsure of the correct pressure setting, refer to system specs or consult a technician.
For steam or gas PRVs, additional safety measures and tools may be required (consult local codes or an engineer).

When Should You Adjust a PRV

  • After installing a new PRV
  • When downstream pressure is too low or too high
  • When flow demand has changed
  • If maintenance has been done on the system

Still Not Working

  • The valve may be clogged, damaged, or incorrectly sized
  • Internal components like the diaphragm or spring may be worn
  • Replacement may be necessary
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