Usual story, I want to remove a radiator to decorate but I'm not confident I've found the LOCKSHIELD VALVE. The radiator has a Danfoss Thermostat. When I remove the thermos cover, I can see a pin (that's pushed in and out controlling the temperature) protruding from the center of a nut. Will turning this nut isolate the radiator so that it can be removed? I don't want to unscrew this if it just removes the "pin parts". There's nothing else that could be used to isolate the radiator so I'm guessing this nut is what I'm looking for.