loud buzzing is not "normal

usually indicates solenoid core not retracting to a "happy" position.

tap on it lightly when actuated, wee if it stops.

otherwise, unscrew it, rinse it out (be careful to not loose core or
little spring), re-install, check operation.

I had one that was all corroded (stainless bracket AND wires) hummed
like crazy, I replaced it with a new unit but I cleaned up the old,
soldered new leads & heat shriink tubing.

Works fine but I never put it back in service

cheers
Bob