Which symptom indicates internal leakage past the spool of a hydraulic directional control valve?

💡 Explanation

When the spool has internal leakage, fluid bypasses the intended path, especially under static load, causing actuator drift because the valve fails to hold position against external forces. Therefore actuator drift occurs, rather than overheating, cavitation, or chatter which imply other valve or system dysfunctions.

• Which limitation is encountered when using a screw pump to increase flow rate in highly viscous fluid?
• Which constraint dominates when hot-carrier injection damages a MOSFET?
• Which outcome occurs when a micro-robot's inertial measurement unit (IMU) experiences accumulated gyroscope drift?
• Which risk increases when rapidly closing a gate valve in a long oil pipeline?
• Which risk increases when a silicon-controlled rectifier's (SCR) gate loses control?
• Which mechanism causes voltage imbalance in a three-phase power distribution system when single-phase loads are unevenly distributed?