A water pressure regulator is a dome shaped brass fitting that generally is found just past the main shutoff valve where the main water line enters the house.
Where is my water pressure regulator.
They can eventually plug with debris.
Your pressure relief valve let s stop using acronyms is probably located on your water heater it is actually a temperature pressure relief valve.
If it exceeds 50 p s i.
It usually has an adjustment screw on top.
Inside a water pressure regulator has a variable spring loaded diaphragm that automatically widens and narrows depending on the amount of water pressure entering the valve.
Try to adjust the pressure on the valve.
Test your water pressure past the pressure reducing valve.
Sometimes a pressure only relief valve will be located on supply piping also.
This will cause your water pressure to be much lower when a second or third tap is.