How to repair a thermostatic radiator valve (TRV) using a service tool

Introduction – In this how to page we show you how to replace a faulty / leaking TRV insert using a service tool. This can save on having to drain down the system as it works on the live system.

Video – How to Change a faulty radiator TRV valve without draining using a IMI removal tool.

In the video below, it shows how certain valves are compatible with removal tools. For this video we have used an IMI valve removal tool on a Altecnic/ Caleffi TRV.

Show below is a table showing popular TRVs and the availability of repair tools as well as compatibility with the IMI tool.
BrandModelRepair Tool availableCompatible with IMI Radiator valve removal toolNotes
Altecnic Ecocal YesYesAltecnic / Caleffi have their own service tool.
Drayton RT212YesNoThis TRV has it's own gland replacement tool, possible to do without draining down.
- Drayton TRV replacement gland seal kit (0735009)
- Includes 2 gland seals and a pre-setting / balancing key (0735162)
DraytonTRV4YesNoThis TRV has it's own gland replacement tool, possible to do without draining down.
- Drayton TRV replacement gland seal kit (0735009)
- Includes 2 gland seals and a pre-setting / balancing key (0735162)
HoneywellValencia V120YesYesHoneywell service tool
- VA8200A001 TRV Service tool
HoneywellV117eNoNoHoneywell service tool
- VA8200A001 TRV Service tool
IMIEclipseYesYes
IMI CalypsoYesYes
PeglerBelmont IIIYesYes
PeglerTerrierNoNo

Common problems with TRVs and radiator valves

– Leaking glands
– Broken shafts.
– TRV pins that have stopped moving properly or internals are not functioning properly

Disclaimer: Information on this website is provided for informational purpose therefore we cannot accept liability for subsequent problems. All repair tasks should be carried out by qualified trades people. We may also receive commission payments when you are taken to external websites and complete purchases from third party sellers, once you leave our site, we cannot be held liable for your purchases.