Stumped: Noisy check valve?

RuralPastor

Well-known member
I broke the inlet off my city water connection and replaced it with a Valterra all brass model with a check valve. Now, when I run water, there is a squealing, humming-type noise coming from the inlet device. I removed and inspected the back flow preventer. No change. I adjusted water pressure. No change. Anyone have a cure? Thanks, any help appreciated!
 
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