XP on a hydraulic pilot-operated DCV means ____________.

• A. an extra pilot port
• B. extra high pressure
• C. external drain
• D. external pilot

Answer: (D)

XP on a hydraulic pilot-operated DCV means an external pilot. In a pilot-operated directional control valve, a small pilot pressure moves the main spool. When XP is shown, the pilot signal is supplied from outside the valve body—through an external pilot line or circuit—rather than being generated inside the valve. This lets you drive the valve from a separate control source or logic signal, providing isolation between the control and the main hydraulic circuit. The other ideas don’t fit because XP does not indicate an extra internal pilot port, higher pressure, or an external drain.