How does it work? - Inside the Ecocal™ Thermostatic Radiator Valve (TRV)

[@jlongrigg]

Thanks for sharing this. I recently replaced Myson TRV with one from Toolstation - the head only, which fitted on okay. I also did the same with one from ebay. When I switched the heating on, the room temperature was already 18 degrees in the two rooms and the trv was set on number 1, but the radiators still warmed up - eventually reaching 20 degrees, yet the TRV shouldn't have activated because number 1's temperature activation was no more than 14 degrees. I expected to turn the knob to number 3 if I wanted 20 degrees. Do some of these TRVs not work as expected for some reason? I could go out and purchase your brand but I am unsure if I might experience the same problem.

[@donnaham9724]

How do I completely stop any water passing the valve so I can get the radiator off? Thank you