Importance

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Abstract

A spool type valve for minimizing degradation in sealing ability is provided. The spool type valve comprises a spool 30 having land portions 36A-36E. The spool is inserted into a sleeve 20 for slidable movement along the axis thereof so as to define a plurality of fluid passages 23, 24 in the sleeve. The spool controllably opens and closes ports 21A-21E of the sleeve. Each land portion includes a slider member 38 and an O-ring 37. The slider member is divided into plural elements and is in slidable engagement with the inner wall 22 of the sleeve. The O-ring is adapted to resiliently urge the slider member against the inner wall of the sleeve. The slider member includes an annular groove 39B into which the O-ring 37 is fitted.

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First Claim