Find out the common causes, such as gasket deterioration, wear and tear, high water pressure, and more. *i did use the old tailpiece & union bc they appeared to be fine Thats seems likely to be related and defective/failed
Standard Pressure
Specifically, the typical design of a pressure regulator (which is the general class to which pressure reducing valves belong) has a rubber (or sometimes thin stainless steel) diaphragm between the working fluid and the area where that adjustment screw comes out.
Over time, your pressure reducing valve (prv) can wear out and cause serious issues for your home
Look out for these signs that it's time to replace your prv. This video shows the symptoms of a leaky pressure reducing valve (prv) and how to replace it A leaky prv does not regulate the static pressure although it still regulates the running pressure. The easiest way to tell if your pressure reducing valve is bad is if you have fluctuating water pressure
It could also make unusual noises or leak around the valve The best way to know for sure is to put a pressure gauge on the water and check the pressure. You may find that your water pressure relief valve may begin to leak after it has been flushed.
