Electro-hydraulic systems

Details Electro-hydraulic systems Electro-hydraulic systems

1977-10-12

1980-02-26

Michalsky, Gerald A.

Fluid handling

Systems

Line condition change responsive release of valve

13762565, F15B 13044

Patent

active

041900812

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, speed reducing coupling means such as a leadscrew or worm and worm wheel driving a rack and pinion, 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, and a centering unit for centering the valve in the absence of hydraulic pressure, can also be provided.

REFERENCES:
patent: 3921666 (1975-11-01), Leiber
patent: 4046165 (1977-09-01), Rose, Sr. et al.

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