Radiator valves which one do I turn, what direction, which one is the flow.

Radiator valves. There seems to be lots of confusion. From what direction to turn them off ? How do I know what valve is the flow ? What is a lock shield valve ? Can I balance the heating system by just adjusting the thermostatic radiator valves ? My valve is not working and so on. In this video I will try to explain all.
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Видео Radiator valves which one do I turn, what direction, which one is the flow. канала dereton33