OP
clueless456
DIY
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The valve on the other side is called a lockshield valve, and it is used when balancing the radiators so that they all give equal heat out. You wouldn't adjust it yourself.
The threads are standard right hand threads, so tighten as you would a normal nut on a bolt.
I am not experienced with tightening nuts in general, but I do have a tool box... I do not want to cause a flood by loosening the nut.... Is it generally left for loose and right for tight?