My incoming pressure gauge read 85psi from meter. My outgoing pressure after pressure reducer is 55psi. When using shower it decreases to about 45 psi. But incoming from still reads steady 85psi. Is this normal? It’s a zurn Wilkins 70xldu.
Turn the pressure up after the PRV to 75 psi and see how it behaves. The PRV may have an inlet screen/strainer that needs cleaned. The downstream pressure should remain fairly steady with flow until the capacity of the PRV is exceeded or the inlet pressure falls.