Load compensated servo system to control flow rate as a function

Details Load compensated servo system to control flow rate as a function Load compensated servo system to control flow rate as a function

1988-08-22

1989-08-08

Michalsky, Gerald A.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91461, 137596, F15B 13043

Patent

active

048542229

ABSTRACT:
A hydraulic servo system to control flow rate of working fluid to a hydraulic motor as a function of command includes a spool-type pilot valve with manual or electrohydraulic structure for positioning the pilot valve and control conduits connecting the pilot valve to a flow control valve having lands and chambers between the lands for directing flow to the hydraulic motor, the flow control valve having a cylindrical cavity at one end and being exposed to full system pressure at the other end, a shuttle valve coaxially positioned with respect to the flow control valve having an axial extension extending into the cylindrical cavity, a spring in the cavity which tends to urge the flow control valve in a direction to oppose the system pressure, with control passages connecting opposite sides of the shuttle valve with the flow control valve chambers causing the shuttle valve to select the higher pressure in the flow control valve chambers and causing the spool to seek a position providing the desired flow rate.

REFERENCES:
patent: Re29329 (1977-08-01), Walters
patent: 3410306 (1968-11-01), Malott
patent: 3896852 (1975-07-01), Holmes
patent: 3899001 (1975-08-01), Orme
patent: 3978891 (1976-09-01), Vick

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