Hydraulic circuit system

Details Hydraulic circuit system Hydraulic circuit system

1992-02-14

1995-12-26

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

91517, F16D 3102

Patent

active

054776783

ABSTRACT:
In a hydraulic circuit system, when pressurized oil discharged from a single hydraulic pump is supplied to a plurality of actuators: the pressurized oil is supplied to heavily-loaded ones of the actuators at gradually reducing flow rates to reduce a shock, while supplied to lightly-loaded ones of the actuators at gradually increasing flow rates to increase working speeds of these lightly-loaded actuators. The hydraulic circuit system comprises a plurality of directional control valves (2) one of which is provided with pressure-compensated flow control valves (18) each of which is provided with a load lead-in passage having a restriction means (R). In addition, further comprised in the system are: relief valves (22, 22) for relieving the pressurized oil under the influence of load pressure of the actuators (3) operated by the directional control valves (2); a restriction orifice (24) provided in a drain side of each of the relief valves so as to produce pressure therein.

REFERENCES:
patent: 3414017 (1968-12-01), Hodgson
patent: 4693272 (1987-09-01), Wilke
patent: 4986071 (1991-01-01), Voss et al.
Pippenger, Fluid-Power Controls, McGraw-Hill Book Co., Inc., copyrighted 1959, p. 75.

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