Unscrewing Coupler Direction for Radiator Bleeding & Stuck Nipple Handling: Left or Right?

I want to bleed the radiator. It would seem like a simple activity, especially since I have done it before, i.e. closed the valve, loosened the connection between the valve and the radiator and waited for the air to come out. However, this year, probably due to the old age of the elements, I cannot loosen this nut, because no matter which way I try, the whole valve turns.

I have doubts which way to unscrew this connector? Is it like in the photo, i.e. to the left, looking from the valve side?

How to deal with a nipple stuck on the valve? I hold the valve with the other key, but I'm afraid it will break - it will twist.

As you indicated. First, however, remove the head - it will be safer and more convenient.
Put a well-fitted wrench on the part you are talking about, the other one on the side of the pipe. And do not press with uniform force, but tap the wrench on the side of the semi-union with your fist, preferably with a hammer.
The old mechanics way, very effective.

Added after 15 [minutes]:

benbog wrote:

the entire valve turns

do not let this happen, because if the connection between the valve and the supply pipe becomes unsealed, it will be self-venting involuntarily ...

I coped with the "way", now there is only a problem with tightening the connector, because it is minimal, but it seeps and I'm afraid to twist the valve. I tried the method of slightly moving the valve and tightening the fitting at the same time, and it helped.

Maybe you can stop the leak somehow. You put on the key a bit weird, because if you miss something, you can smash your head. And the nut after such an operation looks wounded.

A method

benbog wrote:

move the valve slightly

you can really make a mess. The valve screwed to the pipe should not be moved on this side.

If the valve has been screwed into the pipe on hemp saturated with thread paste, a slight movement should not unseal the connection. Worse, if it was screwed on a Teflon tape - then any movement could unseal the thread. This nut of this valve screw connection shows that it was unscrewed more than once with the wrong wrench - maybe with a "franuz" (it is shown in the photo).

Added after 3 [seconds]:

If the valve has been screwed into the pipe on hemp saturated with thread paste, a slight movement should not unseal the connection. Worse, if it was screwed on a Teflon tape - then any movement could unseal the thread. This nut of this valve screw connection shows that it was unscrewed more than once with the wrong wrench - maybe with a "franuz" (it is shown in the photo).

Zbigniew Rusek wrote:

the valve was screwed onto the pipe on hemp

the other way around, my friend

Gentlemen, I have finished and described everything, because it may be useful to someone. Of course, the seals are on tow, I would not risk taking Teflon at all.

Injured caps were already there, because a few years ago a magician from a cooperative also caught them with both French and frogs. Since it flooded my bathroom in the process, since then I prefer to tire myself out. When unsealing, I cover the valve with a cloth and put the container underneath. This prevents the water from splashing out once the air has gone out.

Thank you for your comments, and after the heating season, I will report the need to regenerate this connector.