| 摘要 |
A valve assembly having a valve spool shiftably mounted within a housing and provided with an alignment sleeve surrounding the spool. The alignment sleeve is supported on the housing by a resilient seal ring for permitting limited relative movement between the sleeve and the housing. The alignment sleeve and the housing define axially therebetween a narrow ring-like passage surrounding the valve spool for providing communication between a pair of ports formed in the housing. The valve spool has a resilient seal ring positioned thereon, which seal ring is adapted to completely cover the ring-like passage when the valve spool is shifted between its extreme positions.
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