Method for manufacturing spool valve
US6675477B2 · kind B2 · utility
0Cited by
12References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2002 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Nov 21, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8671
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A spool valve is provided which has a plurality of small-diameter portions formed at predetermined spacings on a peripheral surface of a shaft, and pairs of annular ridges on peripheral surfaces of the small-diameter portions to have a larger diameter than an inner diameter of collars. The collars are closely fitted between the annular ridges to make valve bodies, and the collars include an inner wall, an outer wall and at least one connection therebetween, and an annular gap is provided between the inner wall and the outer wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.