Bidirectional pilot operated control valve
US6328275A · kind A · utility
43Cited by
13References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2000 |
| Grant date | Dec 11, 2001 |
| Priority date | — |
| Expiry date | Sep 8, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7771
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pilot operated valve is provided to control a bidirectional flow of fluid between two ports. A main poppet selectively controls flow of fluid between the ports in response to pressure in a control chamber on one side of the main poppet. A pilot passage in the main poppet extends between the second port and the control chamber A first pair of check valves allow fluid to flow only into the pilot passage from the two ports. A second pair of check valves allow fluid to flow only into the control chamber from the two ports.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.