Hydraulic circuit with a switchover valve for switching between a high and a low-pressure relief
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United States of America Patent
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Aug 11, 1992
Grant Date -
N/A
app pub date -
Mar 16, 1990
filing date -
Apr 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic circuit, for use with i.e. a backhoe implement of a work vehicle. The circuit includes an engine, first through third pumps driven by the engine and a plurality of actuators. The invention is characterized by a relief pressure switchover device for selectively providing a first mode for realizing a low relief pressure in the first and second feed oil passages and a second mode for realizing a high relief pressure in the same and a relief pressure control device for causing the relief pressure switchover device to automatically provide the first mode when the third pump is loaded and causing the switchover device to automatically provide the second mode when the third pump is unloaded.
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