Valve control unit for hydraulic actuator

Details Valve control unit for hydraulic actuator Valve control unit for hydraulic actuator

1994-09-28

1995-12-26

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Electrically operated

91461, F15B 13044, F15B 1108

Patent

active

054777704

ABSTRACT:
A valve control unit includes a main hydraulic oil circuit and a pilot oil circuit. The main circuit includes a main pump, a main valve downstream from the main pump, and a hydraulic actuator downstream from the main valve. The pilot oil circuit circulates pressurized pilot oil to control the main valve and includes a pilot oil pump, an automatic control switching valve downstream from the pilot oil pump, a manual limit switching valve downstream from the pilot oil pump, a manual control switching valve downstream from the manual limit switching valve, and a pilot oil chamber downstream from the manual control switching valve. The pilot oil chamber is located near the main valve such that the flow of pressurized pilot oil moves the main valve.

REFERENCES:
patent: 4625622 (1986-12-01), Gunda et al.
patent: 5110085 (1992-05-01), Iwasawa
patent: 5235809 (1993-08-01), Farrell
patent: 5333533 (1994-08-01), Hosseini
patent: 5357878 (1994-10-01), Hare

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