System for allocating fluid from multiple pumps to a plurality of hydraulic functions on a priority basis
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United States of America Patent
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Jul 28, 2015
Grant Date -
Sep 20, 2012
app pub date -
Mar 15, 2012
filing date -
Mar 15, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A valve assembly has a flow summation node coupled to a displacement control port of the first pump. Each valve in the assembly has a variable metering orifice controlling flow from an inlet to a hydraulic actuator and has a variable source orifice conveying fluid from a supply conduit to a flow summation node. The source orifice enlarges as the metering orifice shrinks. Each valve includes a variable bypass orifice and the bypass orifices of all the control valves are connected in series forming a bypass passage between a bypass node and a tank. The bypass node is coupled to the flow summation node and receives fluid from a second pump. At each valve, a source check valve conveys fluid from the supply conduit to the inlet and a bypass supply check valve conveys fluid from the bypass passage to the inlet.
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