On 27/09/2019 17:38, AnthonyL wrote:
I think the penny is dropping slowly. There are at least two types of
valve head. One which is purely mechanical so the user has to turn
the knob to allow more or less heat through the radiator. The other
is thermostatic so it attempts to stop the room from getting warmer
than it is set to. Is that right?
Yes. The latter is called a TRV, Thermostatic radiator valve.
In general a wax cylinder exapands and pushes the pin to cut off the rad
at a given point



--
€œI know that most men, including those at ease with problems of the
greatest complexity, can seldom accept even the simplest and most
obvious truth if it be such as would oblige them to admit the falsity of
conclusions which they have delighted in explaining to colleagues, which
they have proudly taught to others, and which they have woven, thread by
thread, into the fabric of their lives.€�

ۥ Leo Tolstoy