Cantilever beam positioner for valve actuators

Details Cantilever beam positioner for valve actuators Cantilever beam positioner for valve actuators

F - Mech Eng,Light,Heat,Weapons

15

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251/18

F15B 13/16 (2006.01) F16K 31/00 (2006.01)

Patent

CA 1103645

CANTILEVER BEAM POSITIONER FOR VALVE ACTUATORS Abstract of the Disclosure A pneumatic valve actuator having a rotatable output shaft is provided with a valve positioner comprising an axially displaceable spool valve and a pneumatic trans- ducer responsive to applied signal air pressure for dis- placing the spool valve away from a neutral position to effect rotation of the actuator output shaft. The actuator output shaft is gear-connected to an element which rotates with the output shaft, and an elongated cantilever beam spring attached at one end to the rotatable element extends in a direction transverse to the axis of rotation of said element to the transducer for providing a feedback force which balances the control signal responsive transducer force when the actuator output shaft has rotated to a desired position.

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