Electronically controlled positioner for pneumatic actuators

Details Electronically controlled positioner for pneumatic actuators Electronically controlled positioner for pneumatic actuators

G - Physics

05

B

341/103

G05B 11/44 (2006.01) F15B 9/03 (2006.01) G05D 3/14 (2006.01)

Patent

CA 1214533

ABSTRACT OF THE INVENTION An electronically controlled apparatus for controllably positioning pneumatic actuators includes, in a first embodiment, first means for selectively flowing compressed fluid to the actuator and valve means for selectively exhausting compressed fluid from the actuator. An electronic control panel is adapted to receive digital command signals from a computerized controller and is coupled to the first means and to the valve means for actuation thereof in response to the command signals. Means are included for isolating electrical switching transients from the controller. In a second preferred embodiment, the positioner also includes transducer means for generating a feedback signal representative of the position of the actuator piston assembly. A third preferred embodiment is similar to that of the second embodiment and incorporates a control adapted to receive analog rather than digital command signals. An optional high limit pressure switch may be used with any embodiment.

431461

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