Odd radiator bleed valve

[rdwm]

Any ideas on what type of valve this is, or, more importantly, how to get it working?

Looks just like a nipple but appears to have some sort of locking ring behind it...I've tried tapping it but to no avail...

 

[Softus]

What are the symptoms of the plumbing or heating problem you need help in solving?

 

[rdwm]

Long story

After shearing off a rad valve top a few days ago, I've replaced the valve this morning. Naturally, I took the radiator off the wall to do so. Valve replacement went smoothly, repressurised the system, bled all the rads one at a time, until I came to this one, that I'd taken off the wall.

In short, it's an empty radiator going back on the wall so will need bleeding.

Edit: Ought to say that it's quite an old radiator, with only two inlets at the base, thus the valve is the only way to bleed it (that I know of).

 

[gas_man_gaz]

looks like a norm bleed screw what has rounded off, cud try some little grips on it

 

[Softus]

If it's a normal rad vent, then remove it and replace with a new one.

If it's not a normal one, then remove the rad again, drill and tap a new hole, and fit a new vent, leaving the old one in place.