Patent ID: 7788915

Claim:
A hydraulic circuit comprising: a first hydraulic actuator; a first hydraulic pump driven by a drive source so as to deliver fluid to the first hydraulic actuator; a motion switchover valve disposed between the first hydraulic actuator and the first hydraulic pump so as to switch a motion of the first hydraulic actuator; a hydraulic pressure regulation system for adjusting a differential pressure of the motion switchover valve between a delivery port of the first hydraulic pump and a suction port of the first hydraulic actuator to a predetermined value; at least one second hydraulic actuator; a second hydraulic pump driven by the drive source so as to deliver fluid to the at least one second hydraulic actuator; and a recovery passage for supplying the first hydraulic pump with fluid from the motion switchover valve to which the fluid is returned from a drain port of the first hydraulic actuator, so that the second hydraulic pump is driven by the fluid from the recovery passage.