Hydraulic control device

Details Hydraulic control device Hydraulic control device

2011-01-18

2011-01-18

Lazo, Thomas E (Department: 3745)

Power plants

Pressure fluid source and motor

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

C091S516000

Reexamination Certificate

active

07870729

ABSTRACT:
The invention relates to a hydraulic control device for a priority, first hydraulic consumer and a subordinate, second hydraulic consumer, pressure medium being deliverable to the first or the second consumer via a first or a second metering diaphragm. A pressure scale which allows a constant pressure difference to be adjusted above the first metering diaphragm is mounted upstream from the first metering diaphragm. For this purpose, said pressure scale is provided with a valve piston encompassing a first control edge, by means of which a first flow area between a feeding duct and the first metering diaphragm can be controlled. A second control edge which allows a second flow area to be controlled between the feeding duct and a load signaling line is provided on the valve piston of the first pressure scale.

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