Odd radiator valves

My house has this type of valve. It became obsolete (ish) by 1990.

If you remove the domed cap (it shouldn't leak) there is a coarse threaded screw underneath that is the lockshield adjustment.

The flow is taken by a long plastic tube to about a third of the way along the radiator - shooting the flow to the far end so that it circulates and returns coaxially back down the return.

See this:

They were made by Yorkshire Valves - called Twinfast I believe

Yorkshire Maxitwin is the name

..and the cap itself screws off too.

Thanks for the replies. I'll have a go at screwing the cap off then and see if an adjustment of the return pipe makes a difference. As I said though I suspect someone has switched the flow and return pipes as the return is hot and flow cold! I guess it wouldn't make much difference with standard valves but these may be different. Thanks again

Jon

adder1969 wrote:

Didn't seem to make much difference to one of my rads but sure it makes it harder to adjust and often the lockshield valve part will drip a bit if you're planning on adjusting it often. I've changed mine around now though.

I recently replaced a double rad with a newer one and when I came to put the feed pipe in I realised that the layout of the pipes meant I couldn't so I'm goign to have to run a pipe around the back and fit a tap either end.

Sorry - Maxitwin