Repressurize and Test the System — Fine-Tune and Re-Test
Part of project
How to Adjust a Water Pressure Reducing Valve (PRV) · Step 5 of 7
In this video
Now it's time to test your adjustments. First, ensure the drain valve or hose bib is closed. Replace the cover on the pressure switch and tighten the nut. Go back to the electrical panel and turn the circuit breaker for the well pump back on. The pump will immediately start running to fill the tank and build pressure. Watch the pressure gauge closely. The pump should stop when the pressure reaches your new target cut-out pressure (in this case, 110 PSI). After it stops, slowly open the drain valve to release water and simulate use. Watch the gauge again. The pump should kick back on when the pressure drops to your new cut-in pressure (90 PSI). If the pressures are slightly off, turn off the power again and make small, incremental adjustments to the large nut on the pressure switch until the system operates at the desired pressures.
Goal: Verify the new pressure settings
Used in this video
- Pressure Gauge (brand: Merrill, Tool Type: Measuring Tools) — Monitoring the water pressure during testing.
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FAQs
What kind of pressure gauge do I need for this project, and why can't I just guess?
You need a specific water pressure test gauge, like the Watts DP IWTG or Orbit 91130, which connects directly to a hose bib. These gauges provide accurate PSI readings essential for setting your water pressure precisely between 50-60 PSI. Guessing can lead to incorrect pressure, potentially damaging appliances or fixtures.
Is it safe to adjust the PRV myself, or should I call a plumber?
Adjusting a PRV is considered a beginner-level DIY task and is generally safe if you follow instructions carefully. Ensure you have the proper tools and make small, incremental adjustments while re-testing the pressure frequently. If you encounter leaks, stripped parts, or persistent issues, then consulting a professional plumber is advisable.
What's the biggest mistake a beginner might make when adjusting their PRV?
The most common mistake is making large adjustments to the pressure bolt without re-testing the pressure incrementally. This can easily lead to over-pressurization or under-pressurization, requiring more effort to achieve the desired setting. Always turn the adjustment screw in small increments (e.g., quarter-turns) and re-check the gauge after each change.
My water pressure isn't changing even after I've adjusted the PRV. What could be wrong?
If adjustments aren't affecting the pressure, your PRV might be old, faulty, or completely failed and needs replacement. First, double-check that you're turning the correct adjustment bolt and that the locknut is sufficiently loosened. If the valve itself is defective, no amount of adjustment will fix it, and replacement is the next step.
Repressurize and Test the System — Fine-Tune and Re-Test
Part of project
How to Adjust a Water Pressure Reducing Valve (PRV) · Step 5 of 7
In this video
Now it's time to test your adjustments. First, ensure the drain valve or hose bib is closed. Replace the cover on the pressure switch and tighten the nut. Go back to the electrical panel and turn the circuit breaker for the well pump back on. The pump will immediately start running to fill the tank and build pressure. Watch the pressure gauge closely. The pump should stop when the pressure reaches your new target cut-out pressure (in this case, 110 PSI). After it stops, slowly open the drain valve to release water and simulate use. Watch the gauge again. The pump should kick back on when the pressure drops to your new cut-in pressure (90 PSI). If the pressures are slightly off, turn off the power again and make small, incremental adjustments to the large nut on the pressure switch until the system operates at the desired pressures.
Goal: Verify the new pressure settings
Used in this video
- Pressure Gauge (brand: Merrill, Tool Type: Measuring Tools) — Monitoring the water pressure during testing.
Frequently Asked Questions
What kind of pressure gauge do I need for this project, and why can't I just guess?
You need a specific water pressure test gauge, like the Watts DP IWTG or Orbit 91130, which connects directly to a hose bib. These gauges provide accurate PSI readings essential for setting your water pressure precisely between 50-60 PSI. Guessing can lead to incorrect pressure, potentially damaging appliances or fixtures.
Is it safe to adjust the PRV myself, or should I call a plumber?
Adjusting a PRV is considered a beginner-level DIY task and is generally safe if you follow instructions carefully. Ensure you have the proper tools and make small, incremental adjustments while re-testing the pressure frequently. If you encounter leaks, stripped parts, or persistent issues, then consulting a professional plumber is advisable.
What's the biggest mistake a beginner might make when adjusting their PRV?
The most common mistake is making large adjustments to the pressure bolt without re-testing the pressure incrementally. This can easily lead to over-pressurization or under-pressurization, requiring more effort to achieve the desired setting. Always turn the adjustment screw in small increments (e.g., quarter-turns) and re-check the gauge after each change.
My water pressure isn't changing even after I've adjusted the PRV. What could be wrong?
If adjustments aren't affecting the pressure, your PRV might be old, faulty, or completely failed and needs replacement. First, double-check that you're turning the correct adjustment bolt and that the locknut is sufficiently loosened. If the valve itself is defective, no amount of adjustment will fix it, and replacement is the next step.