Almeno secondo le istruzioni nel seguente documento, dove "pinch" è opposto a "open":

NOTE:
When valves are pinching, at anytime other than when manually setting pinch distance the user may open all valves by holding down the right arrow key.
1.
Press the Enter key on a highlighted Control icon to enter Valve mini menu and edit Valve configurations
2.
Navigate to Exit and press Enter to exit the Valve mini menu
3.
Press the right arrow on the highlighted Control icon to start pinching. If on Manual mode, hold down either the left or right arrow afterwards to manually adjust the pinch distance.
Pressing/holding the left arrow will decrease pinch distance, while pressing/holding the right arrow will increase pinch distance. When satisfied with manually set pinch distance, user may press Enter to tell valve to hold that position
4.
To open valve, user can press the right arrow key on the highlighted Control icon

https://studylib.net/doc/25754756/spectrum-kr2i-kmpi-tff-sys...

--------------------------------------------------
Note added at 38 Min. (2023-03-16 18:54:39 GMT)
--------------------------------------------------

O "stringimento".
Quindi: chiusura/stringimento ecc. automatica/o vs. manuale

--------------------------------------------------
Note added at 48 Min. (2023-03-16 19:04:14 GMT)
--------------------------------------------------

"serraggio"