ᐅ The district heating control unit is switching on too frequently.

Hello everyone,

First of all, the house already exists, but I hope you can still help me?

I live in an old house from 1900 with a district heating system installed. This was renewed about 3 to 5 years ago. That means the valve for the flow was replaced along with the control technology for this valve (plus some piping). The circulation pump remained the same, as did the rest of the heating system.
The circulation pump for the hot water was replaced this year because it broke down. Last year already (just after the warranty ended, of course), the control unit for the valve broke.

Shortly after the installation 3 to 5 years ago, I noticed that the valve switches very frequently. I asked the plumber during the valve installation, but he said this was normal. The process goes roughly like this:

Heating is required, for example.

The control switches the valve to open.
The valve starts to open (there seems to be a small motor with a gear inside, like a little model car motor, which becomes audible as it begins to turn).
The water temperature in the heating circuit (supply line) rises very quickly.
At around 45°C to 50°C (I would say), the heating control switches the valve to close.
The valve then begins closing.
However, the supply water temperature reaches about 75°C to 80°C before the valve is fully closed.
The temperature then slowly drops below approximately 40°C over the next few seconds, and the next cycle begins.

This whole process takes about 10 seconds (I haven’t measured it, but I can if needed?) and repeats throughout the day.
As a layperson, I find this unnecessary. I would have expected the control technology to maintain the supply water temperature around 60°C until the return temperature reached around 50°C. I recently removed the valve (the motor on the valve) and manually operated the valve with a rotary knob, which allowed me to keep the supply temperature at about 70°C for over 5 minutes. During this time, I didn’t have to switch wildly back and forth, but could calmly observe the temperature. The return temperature was constantly at 33.0°C and only increased to 33.5°C after 5 minutes.

My question now is: Do I have poor control technology that is just not working well, or is this really how it’s supposed to work?
The background is, I sit in the attic and generally get cold feet quickly, so I like to keep my feet close to the radiator. Over the day, I observe that the radiator gets very warm for a very short time and then remains only hand-warm or less for longer periods. The radiator valve on this heater is set the same all the time. Other radiators in the house show a similar pattern.
It does get warm, but to my feeling, it all takes too long. Especially when the return temperature currently shows 33°C, I would expect warmer water to be circulated for longer and more continuously.

Do you have any tips for me? Am I expecting too much?

Thanks for reading, I would appreciate your opinions.

Hello, is there no one here who can help me?