Electronically controlled positioner for pneumatic actuators

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

1982-08-20

1984-11-06

Truhe, J. V.

Electricity: motive power systems

Positional servo systems

'feelback' systems

318663, 318662, 251129, 91361, 91363R, 91 37, 91 39, 236 49, G05B 1144

Patent

active

044814518

ABSTRACT:
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.

REFERENCES:
patent: 3487345 (1969-12-01), Watrous et al.
patent: 3521535 (1970-07-01), Oelrich
patent: 3738609 (1973-06-01), Divigard
patent: 3784334 (1974-01-01), Hilgert
patent: 3961224 (1976-06-01), Vreeland
patent: 4261509 (1981-04-01), Anders et al.
patent: 4388570 (1983-06-01), Sangree
patent: 4391320 (1983-07-01), Inoue et al.

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