Your thermostatic valves at the radiators basically control the amount of hot water flowing through the radiators, If this type system is using a single speed pump some method of pump bypass must be provide.
With the pump in the supply header the head pressure would build as one or more of the radiators throttled down thereby restricting the flow in the heating loop.
In your last picture just above the Grundfos circulator pump appears to be a bypass flow control device that has a small pipe tied back into the return line (usually these are adjustable but I can’t see an adjusting knob in the picture) so as your radiators throttle down and the head begins to rise this valve opens and bypasses some of the flow back to the return to keep the head on the pump from rising too high.
Again I can’t tell from the pictures but from your description of the piping you appear to have plumbed it in a two pipe one zone system.
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