Here comes an over-discussed topic, but I don't dare to take a chance, so I'm asking specifically about my connection.

As I understand it, there is a shut-off valve behind the nut on the far right in the picture, but is it fortunate enough that it shuts off both incoming and outgoing water?
If I successfully block the pipes, how do I drain the radiator?
Should you perhaps close the valve behind the nut and then drain the radiator by releasing the pipe at the knob (in the upper part of the radiator) and like suck out the water?!
Very grateful for input!!!

Close-up of radiator piping with a shut-off valve behind the rightmost nut, showing multiple pipes and connectors on a wooden floor.
 
Sure, it worked fine! Inside the "connection" there was a shut-off valve for both incoming and outgoing water. Then I released the upper connection (at the thermostat) and lastly the lower connection. It's important to have towels ready and to be quick in turning the radiator with the open connections upwards, so you don't have to let out all the water.

Finally, I can finish!!!

Radiator with thermostat and pipes, surrounded by insulation foam and towels, showcasing plumbing connections in a renovation project.
 
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