Strange Lockshield type valve???

[Bunglebonce]

Hi all,

am going to balance the heating system after I've done a bit of work to it but I'm puzzled by the valves fitted on the return pipes from the rad.

instaead of the usual Lockshield type they have a flat plastic cap with no screw or slot to remove them. When I prised one off there is water visible inside but its not leaking.

So I replaced the cap until I'm better informed!

Any ideas..?

 

[Softus]

Photo?

 

[Bunglebonce]

Forgive the state of the rad and wallpaper, i've just moved in and it's a bit of a dump at the mo!

 

[JohnD]

is there a pin sticking up under the cap?

let's have a pic with the cap off.

 

[gasacs]

it's a very old valve approx 30 years old and will no doubt leak after adjustment and need replacing..

 

[namsag]

Do not touch it ,to adjust it it needs an allen key and they leak everytime if touched and sometimes severely and not just weeping. So leave well alone or replace

 

[Bunglebonce]

Thanks folks.

I'm going to replace the lot then when I drain down to fit a new rad and fit trvs the other side whilst I'm at it.