Throttling slot configuration for a valve spool

摘要

A throttling slot is formed in a control valve spool and interconnects a reduced diameter portion and a peripheral surface of a land provided on the spool with the throttling slot including a pocket recessed into the land at an angle inclined in the direction opposite to the normal direction of movement of the spool for effecting fluid flow through the throttling slot, and a longitudinally extending groove from the pocket which terminates in an end intersecting the reduced diameter portion.