Controlled pressure upstaging and flow reduction

Details Controlled pressure upstaging and flow reduction Controlled pressure upstaging and flow reduction

B - Operations, Transporting

60

P

138/72.11

B60P 1/16 (2006.01)

Patent

CA 1141265

Controlled Pressure Upstaging And Flow Reduction Abstract An improvement is disclosed in a hydraulic system having a variable displacement pump and being capable of delivering pressurized fluid from the pump to selectively engage at least three work circuits with a first of the circuits being normally operable up to a first pressure and a second of the circuits being normally operable up to a second and lower pressure. The improvement comprises circuitry for selectively operating a third of the circuits at one of the first or second pressures or at an upstaged pressure which exceeds the first pressure and circuitry for reducing the displace- ment of the pump in response to the third circuit being operated at the upstaged pressure. Such upstaged pres- sure is available in a controlled manner for working against particularly heavy loads. Thus, a third and higher operating level is added to a system which already operates at at least two pressure levels.

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