Patent ID: 6615868
Filing Date: 2003-09-09
Classification: F16K,Y10T

Abstract:
A spool valve comprising:a valve housing having a valve bore; an input port and an output port axially disposed from each other and defined in said valve housing and opening into said valve bore; a spool received in said valve bore for sliding movement in an axial direction; a first land and a second land formed on said spool and axially disposed from each other; a groove defined in said spool and connected to said first and second lands through first and second steps; a notch cutout portion from said first step; and an actuator that drives said spool in the axial direction, so that said input port is put into communication with said groove; wherein a fluid flowing into said groove through said input port is discharged from said output port through said groove, and a concave curved face is formed on a bottom of said groove; and wherein said notch in said spool is formed so that a line which extends through a communication zone provided upon communication of said notch with said input port and which forms a free flow-in angle of a jet formed by said notch, points to a portion of said curved face displaced from a smallest-diameter portion toward said first step.