Hydraulic pressure control device

Details Hydraulic pressure control device Hydraulic pressure control device

1998-08-19

2000-12-12

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

60427, 60452, 91446, 91518, 13759613, F15B 11042

Patent

active

061584622

ABSTRACT:
The present invention is directed to a hydraulic pressure control device which can overcome problems, such as a shock to an actuator or a pressure boost phenomenon involving a rapid increase in pump delivery pressure, conventionally encountered when a directional control valve is switched. The hydraulic pressure control device is constructed such that first and second connecting ports are connected to a tank when a directional control valve is in its neutral position, one of the first and second connecting ports is cut off from the tank and connected to an actuator and the other is cut off from the tank and closed when the directional control valve has been switched, in accordance with a position to which the directional control valve has been switched, and a maximum pilot pressure selectively taken from between a pressure compensating valve and a pair of check valves is introduced into a pilot line.

REFERENCES:
patent: 5305789 (1994-04-01), Rivolier

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