Recirculating line not working as expected? Possible the check valve is bad?

[elischleifer]

Hi all,

Before I replace another check valve in my system I was hoping to get some eyeballs on what I am seeing. I've got a recirculating line that a plumber recently added a mix-in vale into the system. Now when I run the recirculating pump I can note a temperature spike running into the hot water supply to the house, but the return on the recirculator line never reaches equilibrium temperature. It doesn't really move at all. This is super weird. I am wondering now if when the pump is running it's somehow not just drawing from the recirc line but from another source (possible the drain from the indirect tank)?

You can see in the attached photos a check valve on the cold water line, if that were busted could this be the problem?

Thanks

 

[breplum]

You can readily remove the check valve by taking apart the two unions.
Examine to see if it is gunked up.
I don't see where the dedicated line returns to the tank, nor an "indirect tank". I doubt you have an indirect tank unless you have a boiler somewhere.
Maybe more complete set of pictures.