As a part of my hot water recirculation system, I installed this brass swing check valve about a year ago on the supply side of my tankless water heater. It appears to be leaking just enough to cause corrosion around a nut on the side. One review of the valve called out removing the screw, putting thread sealant on the screw, then replacing it - I just noticed the issue and did not do this during installation.
Based on the image search I did I think the nut is for the hinge, but I'm really not sure.
The valve does slam shut rarely, particularly when my washing machine is running and quickly shuts off its hot tap.
I have two questions:
- Is the corrosion bad enough that I replace the valve? Or would cleaning it up and attempting thread sealant on the screw be a better course of action?
- Given its use case, and the fact it slams shut when the washing machine runs, is there a better valve for this application such as a spring-loaded check valve? Something else?