Cantilever beam positioner for valve actuators

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

1978-12-04

1980-06-10

Maslousky, Paul E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Bias-type input and feedback signal means

91387, F15B 1316

Patent

active

042066867

ABSTRACT:
A pneumatic valve actuator having a rotatable output shaft is provided with a valve positioner comprising an axially displaceable spool valve and a pneumatic transducer responsive to applied signal air pressure for displacing 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.

REFERENCES:
patent: 671465 (1901-04-01), Bornes
patent: 2789543 (1957-04-01), Popowsky
patent: 2947286 (1960-08-01), Baltus et al.
patent: 3693501 (1972-09-01), Ward et al.
patent: 3915062 (1975-10-01), Westfall et al.
patent: 3971295 (1976-07-01), Nash

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