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Usually with electronically controlled valves or any other device that has movement limits, there will be either a slotted ribbon, or 2 sensors and a stepper motor where the device can auto calibrate by moving until both sensors are hit, then it can calibrate it's self and move to a predetermined home position.
The same is with a ribbon, (a good example of that design is a printer where you will see it spin the feed wheels and move the heads from side to side on startup to calibrate it's self)
Usually electronically controlled valves do not need any user adjustment for calibration. (at least with heating and cooling systems)
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