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 Post subject: Thermo Value Stuck
PostPosted: Sun Sep 10, 2017 8:47 pm 
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Its that time of year again where the central heating must go on!

Bleed all radiators and as usual some radiators did not come on, got 1 out of 3 that did not come on by using the old trick of removing the valve handle and with pliers moving in and out the pin.

However this did not work for 2 radiators; if I leave the pin just a bit in they heat up, but even with oil they are stiff and fail to come on; i.e. when i fit the valve handle it pushes the pin in and off it goes!

So my question is what do I need to replace, they are over 25 years old.

I am not a plumber but can drain the system and refill, just do not want to do any pipe work as in bedrooms!

See photo of valve.

Many thanks,


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 Post subject: Re: Thermo Value Stuck
PostPosted: Mon Sep 11, 2017 11:07 am 
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I am not the expert and hope one will join and advise, but it looks like you have a 1/2 union tail in the rad and unless you are willing (easy job usually, if you have the 1/2 hex allen key tool and the ptfe looks recent with no rust showing on rad boss) to replace the tail with a 15mm compression type, then you need to source original TRV type 15mm x 1/2"" but better take old one to a Plumbing Centre to match up.
Flow direction is important or a bi-directional trv.
If by chance it is older style and hence bigger with 3/4" union, then this is a sample:-

For this message the author aeromech3 has received gratitude : graham101
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