Hydraulic control system

Details Hydraulic control system Hydraulic control system

1985-09-12

1987-06-30

Yeung, James C.

Motors: expansible chamber type

With motive fluid valve

Plural separately controlled waste passages for single...

91454, 60477, 187 17, F15B 1108

Patent

active

046761403

ABSTRACT:
A hydraulic control system for an elevator or other similar reciprocating user is disclosed, which comprises an adjustable throttle valve and a control or bypass valve disposed in the fluid supply line between the pump and elevator. A pressure difference balance is provided for controlling the operation of the control valve, and the pressure difference balance has one end operatively connected to the pressure provided by the pump, and the other end operatively connected to the pressure in the user or load line. The control valve is thus adapted to maintain a desired pressure difference across the throttle valve which is independent of the load on the user. In addition, the zero setting of the pressure difference balance is adjustable, so as to permit the system to be equally operable in both the upward and downward movements of the elevator.

REFERENCES:
patent: 3437012 (1969-04-01), Bjorklund
patent: 3842943 (1974-10-01), Nakamura et al.
patent: 4179889 (1979-12-01), Gondek
patent: 4401009 (1983-08-01), Zeuner
patent: 4548296 (1985-10-01), Hasegawa

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