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Ghost Flow? additional spring check valve?
Radiant heat was installed on the main floor and basement coupled on the existing baseboard heating upstairs. This is the second heating season. The issue is up stairs bedroom are getting warm without the thermostat calling. Looking at the piping it has one supply and two return pipes to the manifold. I see already a spring check valve was installed on the supply line to the upstairs baseboard. I think the ghost flow is going up the return and moving around (like a race track) see attach schematic. My question is could I install another spring check valve on the return side?
Thank you again for the help.