Patent ID: 7882777

Claim:
A hydraulic pressure control apparatus comprising: a direction switch valve for controlling supply and drainage of a hydraulic fluid to and from a hydraulic actuator, the direction switch valve being formed by a spool valve switched between at least two switch positions in correspondence with movement of a spool; a housing including a supply passage for supplying the hydraulic fluid, a discharge passage for discharging the hydraulic fluid, an actuator passage connected to the hydraulic actuator, and a spool bore in which the spool is movably received, the spool bore being connected to the supply passage, the discharge passage, and the actuator passage; a load pressure detection circuit including load pressure detection circuit sections, the load pressure detection circuit sections each corresponding to one of the switch positions, each of the load pressure detection circuit sections detecting a load pressure when the actuator passage is connected to the supply passage, each load pressure detection circuit section being defined by a through hole provided in the housing, the load pressure detection circuit sections communicating with the spool bore; and check valves each arranged in one of the load pressure detection circuit sections, each of the check valves includes a valve seat and a valve body, the valve seat being formed as a portion of a wall of the through hole defining the corresponding one of the load pressure detection circuit sections, the valve body being received in the through hole.