Position sensor for a rotary valve

摘要

A position of a rotary valve having limited motion between an open and a closed position is determined by a limit sensor. A stepper motor supplies power to open and close the rotary valve. A coupling transmits any stepper motor motion to the rotary valve. A sensor actuator is affixed to the coupling. A limit sensor determines the position of the rotary valve by sensing the position of the sensor actuator, wherein there is no contact between the sensor actuator and the limit switch when the position of the rotary valve is being determined.