Fluid handling – Systems – Supply and exhaust
Patent
1990-11-13
1993-02-23
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
60427, 60452, 91446, 13759613, F15B 1308
Patent
active
051881470
ABSTRACT:
A pressure compensating type hydraulic valve wherein a pressure compensation can be made according to the movement of the movable portion of a hydraulic actuator, and the movable portion of the actuator can be stopped against load pressure when it is located at its neutral position. This pressure compensating type hydraulic valve is arranged such that a spool (24) is moved in a valve hole (16) so as to allow a first actuating port (21) and a second actuating port (22) connected with pressure receiving chambers (13.sub.1, 13.sub.2), respectively, defined on both sides of a movable portion (13.sub.3) of a hydraulic actuator (13) to be selectively connected with or disconnected from a first pumping port and a second pumping port in which fluid under pressure discharged by a hydraulic pump (10) flows, through the intermediary of a first check valve (31) and a second check valve (32), respectively, both of which are preset at predetermined pressures, and either one of the actuating ports which is isolated from the pumping port is connected with either one of the tank ports (33.sub.1, 33.sub.2).
REFERENCES:
patent: 3602104 (1971-08-01), Stremple
patent: 4253482 (1981-03-01), Stephens
patent: 4693272 (1987-09-01), Wilke
patent: 4782859 (1988-11-01), Constantinian
patent: 5025625 (1991-06-01), Morikawa
Ishizaki Naoki
Morita Koichi
Shirai Kiyoshi
Takiguchi Takahide
Uehara Kazuo
Kabushiki Kaisha Komatsu Seisakusho
Michalsky Gerald A.
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