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.
| Brand | Model | Repair Tool available | Compatible with IMI Radiator valve removal tool | Notes |
|---|---|---|---|---|
| Altecnic | Ecocal | Yes | Yes | Altecnic / Caleffi have their own service tool. |
| Drayton | RT212 | Yes | No | This 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) |
| Drayton | TRV4 | Yes | No | This 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) |
| Honeywell | Valencia V120 | Yes | Yes | Honeywell service tool - VA8200A001 TRV Service tool |
| Honeywell | V117e | No | No | Honeywell service tool - VA8200A001 TRV Service tool |
| IMI | Eclipse | Yes | Yes | |
| IMI | Calypso | Yes | Yes | |
| Pegler | Belmont III | Yes | Yes | |
| Pegler | Terrier | No | No |
Common problems with TRVs and radiator valves
– Leaking glands
– Broken shafts.
– TRV pins that have stopped moving properly or internals are not functioning properly