As an engineer, I've designed, installed, and changed out pneumatic pressure regulators, hydraulic pressure regulators, and variable digital regulators, as well as check valves, flow dividers, flow regulators, gate valves, needle valves, ball valves, sweated fittings, threaded fittings, and welded fittings. I had never before changed out a residential home's main pressure regulator.
A residential home is supposed to run from 30 to 70 psi for incoming water pressure. Over 70 psi there could be more leaks, possible ruptures, and other problems inside of a home. About a month ago, our house began going "Whoooop!" every time the water was turned off. Flush a toilet, and after the tank filled, "Whoooop!". Turn off the sink, "Whooop". Everytime the dish washer or washing machine filled, "Whoooop!". So when we got our kitchen sink replaced recently with a nice Hansgrohe I asked the plumber to check the incoming pressure. It was 90 psi, creeping up to 100 psi.
I needed a 70XL pressure regulator, which Home Depot had for $70. It fit beautifully into place as a retro fit for the existing failing regulator. All I needed was a pair of ginormous (larger than 1.5 inches) channel locks, and 20 minutes. You can do it too. Read the label on the failing regulator, and get yourself a replacement in-kind. Don't re-use the old seals, and buy an unmolested package that has not been opened-and-returned, so it has all the required replacement hardware.
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