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Adjust the Pressure — Test New Pressure Setting

Beginner

Part of project

How to Adjust a Water Pressure Reducing Valve (PRV) · Step 4 of 6

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In this video

To either increase or decrease the water pressure, use a wrench on the adjusting bolt at the very top of the regulator. To increase pressure, turn the bolt clockwise. To decrease pressure, turn the bolt counter-clockwise. When decreasing pressure, you must simultaneously open a nearby faucet very slightly to allow a small trickle of water to flow. This relieves the excess pressure from the downstream side of the system, allowing the gauge to show the new, lower pressure reading. Monitor the pressure gauge as you make small adjustments until you reach your desired setting.

Goal: Set desired water pressure

  • Lowering pressure has an extra step: you must have a faucet cracked open to relieve the existing pressure in the lines for the adjustment to take effect.
  • Make small, incremental adjustments and check the gauge frequently.

Used in this video

  • Combination Wrench (Tool Type: Hand Tools, Power Source: Manual, Size/Dimension: Varies based on bolt size) — To turn the adjusting bolt on the pressure regulator.
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FAQs

Why is it important to adjust my water pressure reducing valve (PRV)?

Adjusting your PRV protects your home's plumbing, water heater, and appliances from damage caused by high water pressure, which can lead to leaks and premature wear. It also helps conserve water and reduces strain on your system, preventing costly repairs and ensuring efficient operation.

What is the ideal water pressure range for a home, and how do I know if mine is too high or too low?

Optimal household water pressure is generally between 40 and 60 PSI, with 50-55 PSI often considered ideal. Pressure consistently above 80 PSI is too high and can damage appliances and pipes, while below 40 PSI can cause poor shower performance and slow filling times.

What specific tools will I need to adjust my PRV, and is there one that's absolutely essential?

You'll primarily need a reliable water pressure test gauge, such as the Watts 3/4 in. Plastic Water Pressure Test Gauge, and an adjustable wrench. A screwdriver (flathead or Phillips, depending on your PRV model) may also be necessary for the adjustment screw. The pressure gauge is absolutely essential to accurately measure and verify your pressure.

How long should I expect this project to take, especially if I'm a beginner?

For a beginner, establishing baseline pressure, locating the PRV, and making the initial adjustment and re-test typically takes about 15-30 minutes. Allow a bit more time for any fine-tuning or if your PRV is difficult to access, as you may need to repeat the adjustment and test steps.

Transcript
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To raise the pressure, turn the adjusting bolt clockwise. A couple important things, if you're making a large adjustment, don't bottom the adjusting bolt onto the edge of this nut. You can damage the valve. As you're adjusting the bolt, you may have to move the locking nut. You don't want to press the bolt head against the locking nut and strip out the threads. Monitor the gauge and adjust the pressure to the desired reading. When you've adjusted the pressure to the desired setting, open a tap for about 30 seconds and then recheck the gauge. A low of 35 to 40 pounds and a high of 80 pounds is considered normal pressure. For optimal water conservation, the pressure should be 50 to 60 pounds. If you're reducing pressure, you'll have to leave the pressure escape. So, crack a tap very slightly. Turn the adjusting bolt counterclockwise.

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