Valve spool with flow force mitigation features
US11841084B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 2021 |
| Grant date | Dec 12, 2023 |
| Priority date | — |
| Expiry date | Feb 25, 2042 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/8613
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An example spool includes a spool body varying in diameter along a length of the spool body, thereby forming a plurality of lands of variable diameters, wherein a land of the plurality of lands is configured to control fluid flow from a workport passage formed in a valve worksection to a return cavity; and a plurality of axial grooves formed in a circular array about a circumference of the land, wherein the plurality of axial grooves comprises a first set of axial grooves and a second set of axial grooves, wherein an axial length of axial grooves of the second set of axial grooves is greater than a respective axial length of axial grooves of the first set of axial grooves, allowing the axial grooves of the second set of axial grooves to engage the return cavity before the axial grooves of the first set of axial grooves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.