Step open zone valve

Details Step open zone valve Step open zone valve

F - Mech Eng,Light,Heat,Weapons

24

D

341/32, 318/39,

F24D 3/00 (2006.01) F24D 19/10 (2006.01) G05B 11/14 (2006.01) G05D 23/275 (2006.01)

Patent

CA 1136734

ABSTRACT A control system for positioning the output shaft of a motor is disclosed having a motor for positioning the output shaft between first and second positions, the output shaft having an intermediate position between the first and second positions, a motor energizing circuit for energizing the motor to drive the output shaft from the first position towards the second position, a position responsive apparatus responsive to the intermediate position of the output shaft for stopping the output shaft at the intermediate position, a time delay circuit responsive to the output shaft reaching the intermediate position for driving the motor after the passage of a predetermined amount of time to position the motor at the second position, and a return mechanism for returning the output shaft to the first position when the motor is de-energized.

332386

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