Homeowner Forum / Plumbing / July 2008

Last week the county replaced my water meter and installed a backflow
valve. In preparation for this six months ago I had an old pressure
reducing valve replaced and a thermal expansion tank installed on my
water heater by a master plumber.

Since the backflow valve has been installed I am seeing my water
pressure steadily increase after I stop using water. For example, I
will run the water and I see about 48 psi water pressure. After 20
minutes the pressure will increase to around 60 psi. Two hours later
it can be up to 80 psi. After a night's sleep the first flush of the
day is very high powered but I have not stumbled outside to test but
it has to be at least 80 psi if not more.

Does this sound normal or is either my pressure reducing valve or
expansion tank not working properly?

Thanks - Frank