Valve sleeve assembly
US5184643A · kind A · utility
Inventor
Key dates
| Filing date | Jan 21, 1992 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Jan 21, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86879
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A shrunk fit annular valve sleeve assembly characterized by a land configuration which provides a reduced annular area of engagement with the surrounding housing compared to the annular area of the base portion of the land disposed inwardly toward the spool bore to reduce the effects of temperature changes which cause spool bore deflection when using different metals for the housing and the sleeve. One preferred embodiment of a valve sleeve described defines a generally truncated triangular upraised land formed by complimentary shaped adjacent recesses when the sleeve is viewed in a section taken along a radial plane perpendicular to the axis of the spool bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.