What is an acceptable pressure drop when a faucet is opened, if the PRV is functioning correctly and all the pipes are sized right? I have a 1.25” supply transitioning to a 1” and then splitting into two 3/4” lines for the hose bibs The pressure gauge at the hose bib reads 65 psi with no water running. When I open a hose bib next to the one being monitored, the pressure drops to 40 psi. I see drops of 20-24 psi, even when if I were to open a faucet in the home instead.
Thanks for any pointers.