Abstract: A hydraulic block includes multiple pairs of actuator ports connectable to a hydraulic actuator and a discharge oil passage for discharging work oil returned from the hydraulic actuator to the outside. The charge oil passage includes a first oil passage corresponding to a predetermined actuator port of all the actuator ports and a second oil passage corresponding to non-predetermined actuator ports other than the predetermined actuator ports. The first oil passage is disposed in parallel with the second oil passage.

Abstract: A hydraulic block includes multiple pairs of actuator ports connectable to a hydraulic actuator and a discharge oil passage for discharging work oil returned from the hydraulic actuator to the outside. The charge oil passage includes a first oil passage corresponding to a predetermined actuator port of all the actuator ports and a second oil passage corresponding to non-predetermined actuator ports other than the predetermined actuator ports. The first oil passage is disposed in parallel with the second oil passage.

Abstract: A hydraulic circuit includes a first oil passage communicating with a first port of an actuator and a second oil passage communicating with a second port of the actuator. A lower portion-communicating oil passage or oil discharge passage communicates with an oil tank. A first valve is provided between the first oil passage and the lower portion-communicating oil passage or oil discharge passage. The first valve is capable of allowing the first oil passage to communicate with the lower portion-communicating oil passage or the oil discharge passage when a pressure of the first oil passage reaches a predetermined value or higher. A second valve is located in a vicinity of the first valve and between the second oil passage and the lower portion-communicating oil passage or the oil discharge passage.