Hydraulic control systems

Details Hydraulic control systems Hydraulic control systems

1979-08-24

1981-06-30

Bleutge, Robert L.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91446, 1375961, 13759613, F15B 1302

Patent

active

042756430

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.

REFERENCES:
patent: 2933105 (1960-04-01), Jerman
patent: 3807447 (1974-04-01), Masuda
patent: 3903786 (1975-09-01), Walters
patent: 3998134 (1976-12-01), Budzich

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