I have recently moved to this place, and before winter I went to install trvs on the water circulated radiators in order to have some more control over the temp (there used to be manual valves).

Now that the colder days are about to end, I have a question on how would be the best (or recommended) way to maintain those valves when not used. I have read that the thermic piece on the valve may get stuck after a long period of no use, so I am wondering if it would be best to have the valve fully closed (if it gets stuck, should it loose after the circuit warms up again?), or to leave it fully open (so it looses by closing it when needed),

I am from a more tropical climate country where heating in winter is not really necessary, so I am a total strange on how these things should work. All advice is welcome.