Re-Install valve / retract pin ?

[mdillmann]

Hi,
as I have some problems with some valves not closing fully, I thought of unmounting and re-mounting them again just to make sure they fit correctly.

Problem: if I unmount a closed valve (pin fully extended) and re-mount I might apply too much peasure while re-fastening.
So question: is there a mechanism in the valve to go to "fully open" (retract pin) so that is enough space between pin and the valve-head at the radiator ? Should I "deinstall" the valve first per software or simply set the highest manual temperature before unmount/remount ?

Thanks,
-Markus