Proportional valve spool with linear flow gain
US11680649B2 · kind B2 · utility
1Cited by
15References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 26, 2021 |
| Grant date | Jun 20, 2023 |
| Priority date | — |
| Expiry date | Nov 13, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/353
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An example spool includes a shaft varying in diameter along a length of the shaft, and a plurality of annular lands formed on the shaft and spaced-apart by respective reduced diameter annular neck portions. The plurality of annular lands comprise at least one annular metering land, and wherein the at least one annular metering land comprises: one or more sine notches formed as a portion of a sine wave, and one or more additional notches having a different shape from the one or more sine notches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.