Pump-regulator combination with power limitation
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United States of America Patent
Stats
-
Feb 26, 2019
Grant Date -
Mar 30, 2017
app pub date -
Sep 30, 2016
filing date -
Sep 30, 2015
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A pump-regulator combination includes first and second pumps, a control valve, first orifice, and pilot valve. The first pump is configured to pump fluid from a tank to a first point. The control valve is configured to control pressure and/or delivery flow at the first point by adjusting a displacement volume of the first pump. The second pump is configured to pump fluid from the tank to a second point, through the first orifice, and back to the tank. A highest load pressure of the actuator is connected to a third point. The pilot valve includes an adjustable second orifice connected to the third point, via a fourth point, and the tank to pass fluid from the actuator to the tank. A pressure at the second point acts to close the second orifice. A pressure of the fourth point acts to adjust the control valve.
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