Thermal balancing - Initial values taken for adjustment

Oh, and I have to join the question from . At 0.5 and below, I really can't tell anymore if there is still any flow or not. Especially since the readings also fluctuate by about 0.25, I would say.

The flow indicators in your case are just indicators, you can't adjust anything there. You have to remove the actuators and underneath there should be a hexagon where you can then change the flow rate.

I really can't tell anymore at 0.5 and below whether there is any flow at all or not.

You don't have to be able to tell. The flow indicators are an extra or a bonus (call it what you want) and by far not all heating systems have them. But all are still quite adjustable. You just have to know what you're doing and not turn wildly, but count in 1/10, 1/4, or half turns. A full turn is sometimes already too much and could disrupt the entire hydraulics.

Turn carefully and definitely mark the starting position on all circuits. You can do a lot wrong. Photos and documentation are of course mandatory.

Sorry that I have to ask again. I removed the actuator motors some time ago. I have now attached another picture. I wanted to loosen the hex nut or rather turn it to the left to minimize it, but it is quite tight. I did not try with a lot of force, but is it really correct to turn the hex nut or does the copper part need to be moved? In my opinion, the hex nut is stuck. Therefore, it does not seem to be adjustable.

I think you need a square here.

Yes, only the brass part. For you, it is a square. The big one is the entire valve which, of course, you should not touch otherwise the water will come out.

It is clearly visible that the hexagon forms a unit with the bare valve underneath. Of course, you only have to turn the square...