Can't isolate radiator

[Sanjay Savani]

I have a valve on the feed/return of the radiator and i cant shut it off. The trv end shuts off but all my radiators have this (as shown in pic) on the other side which i cant isolate with to change radiator. Help please do i need to drain the whole system to remove one radiator?

 

[Riley]

Is the part in your hand a cap

 

[Sanjay Savani]

Yes it tightens to the outside thread so that being on makes no difference just looks pretty.

 

[Riley]

Difficult to tell from the angle but is it an Allen key type slot?

 

[Sanjay Savani]

The inside is round so not allen key. And the outer nut thing wont turn on any of the rads.

 

[Riley]

The centre of the nut is round but is there a different shape below that in the cavity

 

[Sanjay Savani]

Not sure. It was a mates house he bought an i took that picture earlier today. I will check and see if it ia allenkey inside. I will get back to you on that one tomorrow. Thanks for the reply. Much appreciated

 

[Riley]

Pleasure

 

[Best]

Either a slotted screw or an Allen screw below the caps. Most likely Allen screw on modern LS valves that have no exterior spindle

 

[king of pipes]

As above needs to be shut off with the appropriate allen key count how many turns it takes to close . cheers kop