Swing-frame motor flow and sensed load pressure control system f

Details Swing-frame motor flow and sensed load pressure control system f Swing-frame motor flow and sensed load pressure control system f

1988-09-15

1990-07-03

Garrett, Robert E.

Power plants

Pressure fluid source and motor

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

60420, 60452, 91518, 91529, 91531, 414687, E02F 922

Patent

active

049380230

ABSTRACT:
A fluid pressure control system comprising a first selector valve for controlling the action of a first actuator, a second selector valve for controlling the action of a second actuator, a first flow control valve for controlling a fluid to be supplied to the first actuator, and a second flow control valve for controlling a fluid to be supplied to the second actuator. A pressure reducing valve is provided for reducing the pressure of the fluid supplied to the second actuator. The pressure on the outlet side of the pressure reducing valve is controlled by the proportional pressure relief valve which is controlled by an external pilot pressure. This system is applicable, for example, to a hydraulic excavator.

REFERENCES:
patent: 4449366 (1984-05-01), Sato et al.
patent: 4523430 (1985-06-01), Masuda
patent: 4573319 (1986-03-01), Chichester
patent: 4665698 (1987-05-01), Trusock
patent: 4738103 (1988-04-01), Tha
patent: 4739617 (1988-04-01), Kreth et al.

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