Governing means for a hydraulic actuator

Details Governing means for a hydraulic actuator Governing means for a hydraulic actuator

1981-12-11

1984-04-24

Maslousky, Paul E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91383, 91465, 251 11, F15B 910, F15B 903, F15B 909

Patent

active

044440901

ABSTRACT:
In a hydraulic piston actuator the supply of working fluid is governed by at least one servo valve of the three-gate type, the spring-loaded valve body of which is activated by a thermowire adapted normally to hold the valve body in a position to close-off the supply of fluid. One end of the thermowire is connected to a compensating device, goverened by the movement of the actuator piston in such a manner that thermal movements are partly counteracted. The servo valve may actuate a maximum switch, and a time relay will, after a predetermined period of time put the fluid pump out of action, and connect both sides of a double acting actuator with a return flow tank.

REFERENCES:
patent: 2570624 (1951-10-01), Wyckoff
patent: 4121504 (1978-10-01), Nowak
patent: 4219181 (1980-08-01), Joelson

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