Hydraulic control valve system with electronic load sense...

Details Hydraulic control valve system with electronic load sense... Hydraulic control valve system with electronic load sense...

2006-08-15

2006-08-15

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

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

C060S452000

Reexamination Certificate

active

07089733

ABSTRACT:
An apparatus is provided which has sensors that detect pressure on opposite sides of a control valve which controls the flow of hydraulic fluid from a source to a hydraulic actuator. The sensors produce electrical signals indicating those pressures. In response to the sensor signals, a controller produces an output signal the operates a proportional control valve to thereby regulate pressure at a node of the hydraulic circuit. Several mechanisms are described that react to the pressure at the node by varying the pressure of the fluid being supplied to the main valve so that a controlled pressure level is achieved.

REFERENCES:
patent: 5138838 (1992-08-01), Crosser
patent: 5571226 (1996-11-01), Kobayashi
patent: 6173573 (2001-01-01), Kamada
patent: 6269635 (2001-08-01), Zuehlke
patent: 6389808 (2002-05-01), Sakai
patent: 6560962 (2003-05-01), Sawada et al.

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