Electro-hydraulic directional control valve

Details Electro-hydraulic directional control valve Electro-hydraulic directional control valve

1983-11-30

1985-10-01

Hershkovitz, Abraham

Motors: expansible chamber type

With motive fluid valve

Electrically operated

91461, 13762563, 13762564, F15B 13044

Patent

active

045438757

ABSTRACT:
A first front face of a main control spool of a main control valve is loaded with a constant pressure, whereas the opposite face is loaded with a controlled pressure to control the fluid passages to and from a hydraulic actuator. The control pressure is adjusted by means of a two-edge control of the pilot control spool of a pilot control valve which is actuated by a single proportional solenoid against the force of a spring. The advantages obtained thereby result in a substantial savings in manufacturing expenditure and a substantially improved control operation.

REFERENCES:
patent: 2775982 (1957-01-01), Canfield
patent: 4041983 (1977-08-01), Bianchetta
patent: 4067357 (1978-01-01), Ruchser
patent: 4201116 (1980-05-01), Martin
patent: 4266572 (1981-05-01), Schuttenberg

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