Final answer:
Main pressure is the key factor in determining the position of the governor valve.
Explanation:
Main pressure is the factor that does the most to determine the position of the governor valve in a system. Governor valves are used in machines to control the speed of an engine, and main pressure plays a crucial role in regulating this speed. For instance, in a hydraulic system, main pressure directly affects the positioning of the governor valve based on the pressure changes.
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