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. Which of these are worth fitting is on best radiator valves and TRVs.
| 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 — see How to repair a TRV with a stuck pin