A power steering system for a marine steering includes a hydraulic cylinder, an actuator block that is mounted on an outer end of a ram of the cylinder, and valving. In one embodiment, the valving is located in the hydraulic cylinder and includes at least one flow limiting valve that, through an initial portion of a stroke thereof, limits fluid flow rates through the valve to a generally constant, relatively low level. This limits the rate of extension or retraction of the ram out of or into the barrel and prevents valve chatter. In another embodiment the valving includes ball-type check valves that are located within the actuator block and that are actuated by a rocker arm assembly in the actuator block.