Load sense hydraulic system

Details Load sense hydraulic system Load sense hydraulic system

1998-04-22

1999-07-27

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

91516, F16D 3102

Patent

active

059270721

ABSTRACT:
A load sense hydraulic system includes a pilot operated on/off valve disposed within a signal line which communicates a dynamic load sense signal from a steering control valve to a pressure controller of a load sensing pump. Upon actuating a brake valve or applying a brake mechanism, a pressurized fluid signal downstream of a variable flow control orifice in the brake valve is directed to move the on/off valve to its closed position blocking the dynamic load sense signal from a load sense port to the pump controller. This causes the pump controller to stroke the load sensing pump to its high pressure stand-by position so that the brake valve always functions under high pressure operating conditions.

REFERENCES:
patent: 4034563 (1977-07-01), Orth
patent: 4537029 (1985-08-01), Gunda et al.
patent: 4553389 (1985-11-01), Tischer et al.
patent: 5179835 (1993-01-01), Casey et al.
patent: 5456078 (1995-10-01), Goloff
patent: 5460000 (1995-10-01), Kropp

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