Load-independent control device for hydraulic load devices

Details Load-independent control device for hydraulic load devices Load-independent control device for hydraulic load devices

1990-04-02

1991-09-10

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

90445, 90447, 90461, F15B 1102

Patent

active

050463101

ABSTRACT:
A control device transmits hydraulic pressure from a continuously circulating pump to a hydraulic device. A pressure limiting valve communicates with the pump to exhaust the pump to reservoir when the system is in a stand-by mode. The control device includes a servo valve and a directional control valve. Movement of the latter relative to the former is possible in order to create a pressure back-up in a load indicating line which closes the pressure limiting valve, thereby increasing the pump pressure supplied to the servo valve when it is desired to initiate a working mode. Subsequent actuation of the servo valve causes hydraulic pressure to be supplied to or exhausted from the hydraulic device. Actuation of the servo valve is produced by hydraulic pressure which also communicates with the load indicating line via a one-way valve.

REFERENCES:
patent: 2892312 (1959-06-01), Allen et al.
patent: 4711155 (1987-12-01), Brunner et al.
patent: 4967554 (1990-11-01), Kauss

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