Hydraulic priority circuit

Details Hydraulic priority circuit Hydraulic priority circuit

1976-12-22

1978-01-31

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60431, 60484, 91412, F15B 1116, F15B 1120

Patent

active

040708578

ABSTRACT:
A hydraulic priority circuit for a fork lift truck or the like includes a variable output pump controlled by a motor. The speed of the motor is controlled by feedback from a demand indicator in a primary work system, such as a hydraulic steering system, and from a demand indicator in a secondary work system, including, for example, tilt and lift hydraulic circuits. A valve means, including a priority control valve, a sequence valve, and pressure compensated flow control orifices, is provided to regulate the fluid flow requirements of the primary work system on a priority demand basis, with the excess fluid flow being coupled to the secondary work system.

REFERENCES:
patent: 3355994 (1967-12-01), Malott
patent: 3979908 (1976-09-01), Alderson

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