Replacement of heat convector issues

[diyhelp2022]

Hi,

Looking for some advice please.

We need to initially cap and then replace some heat convectors which are leaking from pin hole leaks in the tube. They are currently closed on the thermostat and produce 3 single drops a day.

They have a Herz valve for 2 pipe system which looks like the picture attached.

1. For capping purposes do you only cap the opening opposite the thermostat head (2) or should both openings be capped (1 and 2 in the diagram)
2. We live on the top of a block of shared flats and may not be permitted to drain the whole system down. Is it possible to do this without draining down the system like I've seen with standard radiators that have valves on either end? - we should be allowed to turn off the pressure pumps. I understand this is not the ideal scenario to do this but as there is no significant amount of water above us would it be doable although messy.

Thanks for your help

 

[OvertonPlumber]

Does your flat have a metering unit for your communal heating?
Bit like this

Google Image Result for https://herzvalves.com/cms_upload/catalog/product_images/1445_hiu_caledonia_0521_1664468822.jpg

Under the lower blank on the valve you can turn of the lockshield and the herz head will turn of positive off.
I no the former managing director of herz UK and we did their offices in Guildford.

 

[diyhelp2022]

Does your flat have a metering unit for your communal heating?
Bit like this

Google Image Result for https://herzvalves.com/cms_upload/catalog/product_images/1445_hiu_caledonia_0521_1664468822.jpg

Under the lower blank on the valve you can turn of the lockshield and the herz head will turn of positive off.
I no the former managing director of herz UK and we did their offices in Guildford.

Didn't know that, would have been a good idea but I'm afraid no metering unit sadly
I reckon it's unlikely they'd have installed a valve under the wooden floor panels which you'd have to lift to access