Hydraulic control system

Details Hydraulic control system Hydraulic control system

1977-10-17

1979-05-15

Michalsky, Gerald A.

Fluid handling

Systems

Line condition change responsive release of valve

91421, 91426, 91446, 91464, 1375962, F15B 1304

Patent

active

041542622

ABSTRACT:
The disclosure is directed to a closed center, pressure compensated hydraulic system which uses a multiple section hydraulic control valve in conjunction with a variable output hydraulic pump. The hydraulic control valve has a plurality of independently operable power spools each of which is used to control the flow of hydraulic fluid to a separate hydraulic actuator and load. Each valve section includes an automatic spool positioner which enables the operator to move the valve handle to a preselected position, the power spool thereafter being retained in such position until the actuator completes its stroke. After completion of the stroke, the automatic spool positioner causes the power spool to return to the neutral position. The multiple section hydraulic control valve also includes means for selecting the highest demand or work port pressure, and for controlling the variable output pump as a function of this selected pressure.

REFERENCES:
patent: 2448532 (1948-09-01), Kirkham

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