Microbore twin entry radiator valve replacement

[zackhob]

My radiator valve is leaking slightly from under the cap.
I tried to unscrew the cap and then reach the nut and tighten it. But the screw holding the cap is rusted and the screw-driver will not hold.
Any advise how to unscrew the cap pleace?
In case I need to replace the whole unit where can one buy a two entry (10mm) TVR or manual valve?
Appreciate if you'll guide a a not-so-experienced- DIYer how to replace the valve or how to unscrew the cap so as to reach the nut and tighten it.... maybe this will stop the slight leak.
Thanks in advance for any help
Zack

 

[mysteryman]

I think you will need to drill the screw out, remove the knob, and tighten up or repack the gland. It's quite a bit of work to change a twin entry valve, even if you can buy one.

 

[zackhob]

Thank you mysteryman. i will try your suggestion.

 

[zackhob]

Dear Mysteryman,
Can u please guide me as to how "to drill a screw out?"
Thanks Again
Zack

 

[Charnwood]

If it’s one of these, you’d better hope it doesn’t need replacing.

We bought the last 1500 made by Yorkshire in 2009 when they said they were discontinuing them as we had a contract with BG.
No merchant, I’m sure, will have one on the shelf.
A German company – Oventropf – may still make them, but it’s doubtful you’ll find them over here.

 

[mysteryman]

Use a very small drill bit in a variable speed drill. Hold it good and steady, go slowly and carefully, and when you have machined away the head of the screw, you should be able to remove the knob. Put a drop of WD-40 on the remains of the screw, and you may be able to undo it with a pair of pliers or small mole grip. Do not attempt any of this if you are not confident.

 

[zackhob]

Thanks for your reply.
It seems you can still get one.
https://www.plumbnation.co.uk/viewquote.php?id=90ea46a2339f0f0d72c797af2f84b0ec

 

[Charnwood]

I’d ring first and get them to check stock.

 

[RAFAdam]

Charnwood, do you have any of the dual valves left? The lockshield screw on my is completely corroded. Thanks Adam

 

[ollski]

Just put a valve at each end and run an extra little bit of microbore pipe to the far end, it’s just simpler than peeing about