Which of the statements is true concerning the illustrated hydraulic circuit when the directional control valve is centered? GS-0105

Correct Answer: Option D — The load on the actuator may cause a difference in pressure to exist between the rod and cap end, and oil discharging to the sump across the relief valve with the pump operating.

When the directional control valve is centered, the pump flow is bypassed to the reservoir. However, the actuator remains connected to the system. If an external load acts on the cylinder, pressure differentials occur, and the relief valve may lift to protect the system from excessive pressure spikes.