Adjusting temperature on this type of radiator valve?

[adgo1]

In my flat I have two types of radiator valve, one that can be adjusted just by turning and a different type of valve (shown in pictures).

Sometimes I want to control the temp in different rooms. If I want to adjust the temperature on these radiators, is the only way to unscrew them and manually adjust the temperature with a spanner?

Thanks.

 

[king of pipes]

These are not much use i am afraid they are either on or off , you need thermostatic radiator valves fitted to have tempreture control. Cheers kop

 

[townfanjon]

Lol , never seen them clamped on

 

[sammathias]

Lol , never seen them clamped on

Yeah you will find they are actually holding the rad on the wall haha. With the help of 2 hooks over top side of rad. Came across a few on a new install few months back. Seemed solid.

 

[Harvest Fields]

I would change them all to TRV’s