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Adjust the Regulator Screw — Make Initial Adjustment

Beginner

Part of project

How to Adjust a Water Pressure Reducing Valve (PRV) · Step 3 of 6

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In this video

Using an adjustable wrench, loosen the locking nut that secures the adjustment screw on top of the regulator. You only need to loosen it slightly to allow the adjustment screw to turn. Once loose, use a large flathead screwdriver to turn the adjustment screw. To decrease the water pressure, turn the screw clockwise. To increase the pressure, turn the screw counter-clockwise. Make adjustments in small, quarter-turn increments.

Goal: Plumbing

  • Make adjustments in small, quarter-turn increments to avoid over-adjusting.
  • On many regulators, turning the screw clockwise DECREASES pressure, and counter-clockwise INCREASES it, which may be counter-intuitive.

Used in this video

  • Adjustable Wrench (brand: Unknown, Tool Type: Hand Tools, Adjustable_Wrench_Size: 8_inch) — To loosen and tighten the locking nut on the pressure regulator.
  • Flathead Screwdriver (brand: Craftsman, Tool Type: Hand Tools, Screwdriver_Type: Flathead) — To turn the adjustment screw 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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water pressure down and it's very simple. You go to your water pressure regulator here and in this case it has a locking nut which I'm going to loosen that just allows me to either increase or decrease the pressure with this screw. So I'm going to loosen the locking nut first thing now I can change the water pressure. So if I want to decrease the water pressure on my system I actually turn this clock over wise to the right and I'm going to do it about quarter turn intervals and then go check and see if my water gauge has now decreased in pressure and I can get a sense of how much pressure I'm decreasing and maybe I can go another quarter turn. Contrarily if my pressure is too low I can bring it up doing the same, making the same effort turning it, turning it now counterclockwise that will increase the pressure for my system.

Auto-generated transcript. May contain errors.