How to Install a Water Pressure Reducing Valve

3/5 Moderate
Requires mid-level plumbing skills
$150 to $3001 to 2 hours

Steps to Install a Water Pressure Reducing Valve:

  1. To gauge the water’s inflow pressure, connect a pressure gauge to a sillcock on hoses or another valve that has an male threaded connection.
  2. The ideal house water pressure is approximately 50 pounds for every square inches (PSI). If the pressure is overly high, you should install the pressure-reducing valve.
  3. With threaded pipes and fittings, join the pressure gauge to the opposite side of the valve that reduces pressure.
  4. Place the valve assembly on the pipe, and mark the area it is to be cut.
  5. Turn off the water supply to the house, then flush the all water from the plumbing system.
  6. Utilize a tubing cutter to cut off a section of water pipe in accordance with the marks created in the 4th step.
  7. Take the pressure gauges and O-rings made of rubber off the assembly of valves.
  8. Apply the flux with a brush onto both ends of valve assemblies as well as onto the end of the pipe that is used for water.
  9. Connect the valve to the copper water pipe.
  10. After the component has cooled, you can reinstall the O-rings and pressure gauges.
  11. Switch off the water and then read the gauge of pressure on the outside of the valve.
  12. If the pressure of the water is excessively high, that is, over 50 PSI–then turn the screw that adjusts the valve counterclockwise.
  13. If the pressure of water is too low, rotate the screw that adjusts the pressure in the direction of clockwise.


  1. Pressure gauge
  2. Pliers
  3. Pipe wrench
  4. Tubing cutter
  5. Propane torch
  6. Open-ended wrench