Hydraulic control systems
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United States of America Patent
Stats
-
Jun 30, 1981
Grant Date -
N/A
app pub date -
Aug 24, 1979
filing date -
Aug 25, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system for operating a double-acting hydraulic ram or motor, including a proportional meter-out type directional-control valve which meters the flow of fluid out of the load and, in association therewith, a combined flow and pressure-control valve in the return line from the load. The flow and pressure-control valve is responsive to the pressure drop across the meter-out orifice of the directional-control valve such that return-line flow is restricted at high pressure drops and the supply pressure to the load is increased at low pressure drops, whereby a substantially constant pressure drop across the meter-out orifice is maintained irrespective of the size or direction of the load.
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