阀芯

The valve spool is a critical sliding component within pilot valves that regulates hydraulic or pneumatic fluid flow by moving axially within a precisely machined bore. Its position determines which ports are connected or blocked, enabling directional control of actuators in industrial machinery. The spool features precisely machined lands and grooves that align with valve body ports to create specific flow paths when actuated by pilot pressure, mechanical force, or electrical signals.

The valve spool operates on the sliding principle where axial movement within the valve body changes the alignment between spool lands/grooves and valve ports. When the spool shifts position, it either connects or blocks fluid passages, directing pressurized fluid to specific ports while allowing return flow from others. This movement is typically controlled by pilot pressure differentials across the spool ends, creating precise metering of fluid flow for directional control applications.