TRVs on rad

[Deanrowland]

Hi guys, new here with just a little query.
I have old TRVs on my rads which im 99% sure are pre-jarrassic... Almost...
Either way they are not working as they should as most will not come on unless fully turned up in winter, which hasnt been a prob till now when ive decided im tightening up the purse strings.
Before winter kicks in i would like to replace them all.
Can i get away with just replacing the top plastic thermostat bit, or wil i need to replace the whole valve?
Will it fit? Standard thread? If it fits, will it work?

Thanks alot, Dean

 

[ShaunCorbs]

whole valve recommened as the pins get warn / stick look like honeywell trv valves

 

[townfanjon]

As Shaun says , defo Honeywell. If the pins move up and down with a push with a hammer shaft , I would be tempted to change the trv only , I think they are Valencia or something like that , just buy one first and see if it fits , I am pretty sure it will .

 

[Harvest Fields]

If the valve looks like they are in a good condition you may get away with just changing the heads. But if they look like they have wept at any point or have silt on them then I would change the whole valve.

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[Deanrowland]

They all look good, but im happy to change them if needed, it just means probably geting a plumber in, whereas i coukd swap the tops in seconds.
So wil any brand fit, or does it need to be honeywell?

 

[townfanjon]

If you are happy to get a plumber in it will be a good idea , any trv will fit.
Personally I fit honeywell , but you could go for what you fancy , change the Lockshield valve ( other end ) at the same time

 

[Harvest Fields]

If you are just swapping the heads. It needs to be Honeywell. But if you are changing the whole lot any will work as long as you buy the correct size for your pipework. But a reliable trv in my eyes is Honeywell.

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