New TRVs

[adrian_t42]

I've just bought some TRVs to replace manual rad valves. I fitted the head to the body to check them out before installing. I found that even with the head set to max the plunger in the valve was firmly pressed into the close position. It was a warm day, my thermometer read 25. But they are supposed to support a temperature up to 28C. Should the collar be fully tightened normally, or is this supposed to be only partially tightened as a calibration? If it is normal to fully tighten the collar should there still be a visible gap at 25C, with the dial set to max? Are they faulty and should I return them? This is for a bathroom so I want to be able to make the towel rail hot when taking a shower. I expected setting it to max to allow water to flow even in warm weather.

 

[oldbutnotdead]

Are these posh electronic trv heads or boring manual ones? And have you tried blowing through the valve?