Is this Radiator Valve Adjustable?

[papachumba]

Hi all, have a radiator in the hallway which has never worked. When I bled the radiators few days ago I checked the hallway one, and it appears to have pressure.
The valve on the right of the radiator is fully open, now the valve on the left I am confused about. It is the type with a small plastic cap on top, and is the only valve of this type in the house. I am unsure whether its an adjustable valve at all. I have tried to open it with pliersin the past but have inadvertedly damaged one of the two top pins holding the plastic cap's screw.
Does anyone know whether this valve is just always fully open, or whether it is adjustable? In which case it could be stuck closed and hence the radiator not working.

 

[ShaunCorbs]

Tbh wants replacing now

Also looks shut

Yes it’s adjustable in regards to balancing etc

 

[papachumba]

Tbh wants replacing now

Also looks shut

Yes it’s adjustable in regards to balancing etc

Will try and sort, but for short term,
how do I try and open? Pliers try to twist or something else?

 

[ShaunCorbs]

Chances are it won’t move as it’s probably seized

 

[papachumba]

managed to undo it with jaw pliers, happy days.