Drain Valve Change Without System Drain?

[Haret1969]

Have one radiator still not working despite whole lot new now and was the only one tepid before all changed and don't really know if drain valve necessary anyway as another drain option outside from another radiator too.

Actual valve on turning weeps water and so was wondering whether considering the pipe feeding it is hot whether it would be possible to change and replace with a new drain valve possible without draining whole system a possibility or just getting rid of drain off valve and plumbing it normally into radiator?

Reasonable amount of sludge in upstairs rads when I flushed all out to decorate despite being new so guessing magnaclean not doing much either from Worcester Oil boiler but maybe Powerflush and Balance a good idea too but rest seem to be working OK
apart from the one main issue so any help and advice much appreciate re changing the Drain Valve without hopefully draining the whole system down please?

Thanks very much

 

[Aquarius]

Depends on what system have, combi, open vent, system boiler? Each having different methods. Where exactly is it leaking from?

 

[Haret1969]

Depends on what system have, combi, open vent, system boiler? Each having different methods. Where exactly is it leaking from?

It's a Worcester Bosch Greenstar External Oil Boiler Condensing Boiler using Balanced Flue system that does Rads&Hot Water Cylinder so Open Vent.

Leaking from the top of the Open/Close spindle to radiator rather than Open/Close Drain Valve.

Thanks for the help

 

[Aquarius]

Have you tried to tighten the gland nut of the spindle? If no success, then you could always try and create a vacuum - if your not comfortable doing this then it would need a drain down.

 

[Haret1969]

Have you tried to tighten the gland nut of the spindle? If no success, then you could always try and create a vacuum - if your not comfortable doing this then it would need a drain down.

Will try that thanks.Re the radiator not heating either when the pipe feeding it is hot to this spindle could that be the reason then?

 

[Aquarius]

Will try that thanks.Re the radiator not heating either when the pipe feeding it is hot to this spindle could that be the reason then?

I wouldn’t have have thought so, but it might be that its not opening, which would be the reason

 

[Stu-B]

Can you freeze it? Shut the other rad valve, whip off the rad and freeze the pipe just a little distance away from the valve

 

[Haret1969]

Can you freeze it? Shut the other rad valve, whip off the rad and freeze the pipe just a little distance away from the valve

Would that be possible on the thin pipe feeding the Rad through the drain valve so I could swap the whole drain valve for a working one?At least I'd know it was opening then and maybe get the rad hot too if poss?
Bit worried re freezing it with system full obviously but is that OK?
Thanks v.much for your help