Replacement TRV Heads

[DIYWell]

I'm after some help identifying an equivalent TRV head.

Some have Danfoss on the tops, others are blank. They must be at least 25 years old, quite probably older.

The valves they are on look like

with the top corrugated part about 17 or 18mm in diameter.

The valves work fine, but the heads are looking tired. What am I looking for as a modern replacement?

 

[Only me]

I very much doubt you’ll get replacement heads for those valves.
I’m sure they are Danfoss. You could try their website but I think you’ll need to renew the valves too.

 

[ianmcd]

I think those ones are a direct replacement but I would e-mail danfoss and attach those pics to be sure before you go and buy them.

https://www.ebay.co.uk/itm/RA-2910-...245692&hash=item3b2e3654a0:g:VdsAAOSwJm9cmnZ9

 

[DIYWell]

Yep, I had it confirmed. The valve is a Danfoss RA, the sensor is an old style RA2000 and the RA2910 is a direct replacement. If the valve plays up, the gland can be replaced so no need to change valves or drain down.

 

[ollski]

 

[ianmcd]

Yep, I had it confirmed. The valve is a Danfoss RA, the sensor is an old style RA2000 and the RA2910 is a direct replacement. If the valve plays up, the gland can be replaced so no need to change valves or drain down.

yes you can replace the glands without draining, a small amount of water will come out but very little as you remove the gland, if it was me doing it for all the time it takes, while replacing the sensors, I would remove the gland and clean the pin with wire wool or emery paper or similar and grease the pin with silicon grease, and refit then fit the new sensor, it only takes a few minutes on each valve