Old & knackered TRV needs replacing.

[bri160356]

I need to replace a failed TRV on a radiator that has 8mm microbore copper piping. The radiator/TRV/piping are all original and have been in place for approx 30 years.

I know that I’ll need a 15mm-8mm reducer as all modern TRV’s have 15mm connectors (is that right?).

However I’m unsure what type of 15mm-8mm reducer to use in conjunction with the new TRV; there seems to be 2 types.......

http://www.ebay.co.uk/itm/281390992...49&var=580419233842&ssPageName=STRK:MEBIDX:IT
and
http://www.ebay.co.uk/itm/231247774...49&var=530473159791&ssPageName=STRK:MEBIDX:IT

Which one will I need???

I’ve changed one of these TRVs about 10 years ago but that was in conjunction with moving the radiator to another wall and adding new pipework, which was increased to 10mm.

I also recall having to remove/replace the internal connection from the radiator itself so that it would accommodate the new TRV fitting/size etc.

It’s so long ago I’m a little uncertain of what details the job entails. Anyone care to enlighten me please.

Also, are these TRVs any good;

http://www.amazon.co.uk/Plumb-Pak-T...mostatic+Radiator+Valve+15mm+-+Elegance+Model


All replies gratefully received. Thank you in advance.

 

[TCCHeating]

Have a look at the 8/10mm danfoss rasc2:

http://heatingnplumbing.co.uk/stock_danfoss_ras_c2_10mm_8mm_angle_trv-299_76.aspx?cp=

They come with both 8 and 10mm reducers and they are good reliable valves. You may need to change the tail peice in the radiator with the one that comes with the new valve. It just depends on what size tail the current valve has.

 

[bri160356]

Have a look at the 8/10mm danfoss rasc2:

http://heatingnplumbing.co.uk/stock_danfoss_ras_c2_10mm_8mm_angle_trv-299_76.aspx?cp=

They come with both 8 and 10mm reducers and they are good reliable valves. You may need to change the tail peice in the radiator with the one that comes with the new valve. It just depends on what size tail the current valve has.

Many thanks for your recommendation............I’ve decided to use the opportunity and change the remaining 6 TRVs as well.
£11.99 each from S/fix.
http://www.screwfix.com/p/danfoss-ras-c-white-chrome-trv-8-10mm-angled/33140

Also, need some inhibitor etc;

Any thoughts on this stuff?; only a fiver!

http://www.jtmplumbing.co.uk/jtm-chemicals-292/corrosion-inhibitor-10108.htm

or same site sells Sentinel X100 @ £14.40.

http://www.jtmplumbing.co.uk/sentinel-160/sentinel-x100-inhibitor-1ltr-3746.htm

Which should I go for?

 

[Terry7556]

sentinal bud