System for precise position control

Details System for precise position control System for precise position control

1980-01-11

1981-12-29

Cohen, Irwin C.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

91 6, 91449, F16K 3102, F16K 3142

Patent

active

043077501

ABSTRACT:
A hydraulic system for precise positioning of a control device, such as a valve actuator. A double-acting, hydraulic cylinder, which operates the control device, is held in any set position by a hydraulic lock ensured by one-way check valves which prevent interflow between the chambers on opposite sides of the piston. Occurrence of a signal indicating a need to change position activates one of two three-way directional control valves allowing exhaust flow from the appropriate cylinder volume. Connected in parallel in the exhaust line is a plurality of on-off valves, each having a flow capacity that is some multiple of that of the next smaller valve, e.g. twice as large. This provides a wide range of distinct and precise flow capacities to provide close and instantaneous control over rate of movement of the positioning device.

REFERENCES:
patent: 764240 (1904-07-01), Hinman
patent: 2390425 (1945-12-01), Crum
patent: 2998515 (1961-08-01), Campbell et al.
patent: 2999482 (1961-09-01), Bower
patent: 3635020 (1972-01-01), Mahlmann
patent: 3700396 (1972-10-01), Adams
patent: 3776249 (1973-12-01), Wailes et al.
patent: 3890992 (1975-06-01), Wolz et al.
patent: 3973595 (1976-08-01), Schmoll
patent: 4019585 (1977-04-01), Dezelan
patent: 4244396 (1981-01-01), Friedland et al.

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