Hydraulic control valve system with non-shuttle pressure compensator
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United States of America Patent
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Apr 6, 1999
Grant Date -
N/A
app pub date -
Oct 23, 1997
filing date -
Oct 23, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
An improved pressure-compensated hydraulic system for feeding hydraulic fluid from a variable displacement pump to multiple hydraulic actuators. A separate valve section controls the fluid flow between the pump and a different actuator. Each valve section has a pressure compensating valve with a valve member and poppet within a bore and biased apart by a spring. The poppet acts as a check valve which prevents fluid flow from the actuator through the valve section to the pump when the back pressure from the load exceeds the pump supply pressure. A pressure differential between the load-dependent pressure and the actuator pressure determines a position of the valve member which controls the pressure applied to the pump pressure control input.
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