Control valve unit for hydraulic actuator

Details Control valve unit for hydraulic actuator Control valve unit for hydraulic actuator

1979-02-22

1981-02-24

Maslousky, Paul E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Valve locking means

91382, 91387, 91461, F15B 1316

Patent

active

042520509

ABSTRACT:
A control valve unit (10) disclosed supplies hydraulic fluid to an actuator (12) in a manner that controls both acceleration and deceleration of the actuator movement. A supply valve (14, 22) of the unit is movable from a central closed position in opposite directions to open positions and back to the closed position by a servomechanism (16) and a control circuit (18) that operates the servomechanism to cooperatively control the supply of the hydraulic fluid to the actuator in a manner which controls both acceleration and deceleration of the actuator movement. A control member (62) of the servomechanism operates the supply valve and is moved in a controlled manner by cooperative operation of a pair of hydraulically operated pilot pistons (88a, b), a pair of acceleration control pistons (90a, b), and a pair of deceleration cams (84a, b). Directional and flow control valves (89, 92) of the control circuit operate the pilot pistons and the acceleration control pistons in cooperation with each other. Velocity governors (197) are also provided.

REFERENCES:
patent: 1912184 (1933-05-01), Ferris et al.
patent: 3290996 (1966-12-01), Floyd
patent: 3745883 (1973-07-01), Ward et al.
patent: 3954045 (1976-05-01), Barlow

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