Valve actuator differential worm planetary gear drive

Details Valve actuator differential worm planetary gear drive Valve actuator differential worm planetary gear drive

F - Mech Eng,Light,Heat,Weapons

16

K

251/20

F16K 31/53 (2006.01) F16H 37/08 (2006.01) F16K 31/05 (2006.01) G05G 11/00 (2006.01)

Patent

CA 1317584

1031-7 ABSTRACT OF THE INVENTION A valve actuator differential worm planetary gear drive pro- vides forward or reverse motion to a valve stem, from an input from either a motor-driven worm or a handwheel driven worm, by using a plurality of planet gears to send motion to the sun gear. If the preference is to have the motor drive the valve primarily, the manual worm stays locked and the motor worm acts as a plane- tary arm. When it is desired to move the valve by hand, the motor gear is fixed and rotation of the handwheel worm gear transmits the power through the ring gear and the planet gears to the drive sleeve. - 13 -

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