Multiple pump load sensing system
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United States of America Patent
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-
May 17, 1983
Grant Date -
N/A
app pub date -
Oct 17, 1979
filing date -
Oct 17, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A load responsive system employing a fixed displacement pump and a variable displacement pump in a parallel circuit as a source of fluid in an open-center load sensing system. The load response control valve includes an unloading spool which is flow responsive in the operative positions of the control valve and maintains a constant .DELTA..rho. across the control valve by dumping the pump flow to reservoir; the control valve .DELTA..rho. being greater than the .DELTA..rho. of the pump compensator means so that the variable displacement pump will remain destroked until the system utilizes the full flow of the fixed displacement pump at which time the variable displacement pump strokes-out upon demand.
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