Electro-hydraulic systems

Details Electro-hydraulic systems Electro-hydraulic systems

1979-05-22

1981-08-25

Rosenthal, Arnold

Valves and valve actuation

With correlated flow path

With mounting or support

74548, 74625, 192 89A, 192 93R, F16K 3105, F16D 1110

Patent

active

042854962

ABSTRACT:
A valve assembly for regulating the amount or pressure of hydraulic fluid supplied to a hydraulically operated machine system comprises a progressively movable valve member, especially a rectilinearly-moving valve spool controlling ports in a ported valve sleeve, a motive power unit, such as an electric stepper motor, disengageable speed-reducing coupling means, including a worm and worm wheel, to convert the rotary output motion of the motor into valve motion, a valve member position feedback transducer, and an electrical controller controlling the motor in response to input command signals and the feedback signal. A manual override control lever is provided for moving the valve member when the power drive is disengaged.

REFERENCES:
patent: 1931655 (1933-10-01), Haseltine
patent: 3408035 (1968-10-01), Lathrop et al.
patent: 3515250 (1970-06-01), Cantalupo

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