The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 1993
Filed:
Nov. 13, 1990
Kiyoshi Shirai, Kawasaki, JP;
Kazuo Uehara, Kawasaki, JP;
Koichi Morita, Kawasaki, JP;
Takahide Takiguchi, Kawasaki, JP;
Naoki Ishizaki, Kawasaki, JP;
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JP;
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).