Load sensed variable discharge fixed displacement pump control with low unload features
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United States of America Patent
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-
Nov 29, 1994
Issued Date -
N/A
app pub date -
Sep 13, 1993
filing date -
Jan 29, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A load sensed variable output gear pump having adjustable high pressure compensation, tuneable response, low unloading pressure and variable pressure drop adjustability. It comprises a unitary housing enclosing a pump which pumps through a main inlet-outlet passage which bypasses through a combined control having a single load sense line. The single control including a chamber connected to the load line by means of a popper with a 2:1 area ratio and a spool having a 1:1 area ratio. An overload control may also be used connected to an inlet load sensing passage which tends to close said fixed and variable controls.
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