Cartridge valve assembly
US7686039B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2006 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Nov 5, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8663
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A cartridge valve assembly includes a body having a pilot port, a first port, a second port, a third port fluidly connected to a central bore, and a spool positioned within the central bore and being movable between at least a first position and a second position. The spool includes a first chamber at a first end surface of the spool in fluid communication with the pilot port, a second chamber at a second end surface of the spool, and a control chamber. The area of the first end surface is greater than the area of the second end surface. A passage fluidly communicates the control chamber with the second chamber. In the first position, the first port and the second port fluidly communicate with the control chamber. In the second position, the second port and the third port fluidly communicate with the control chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.