Viscous damped valve for hydraulic pump
US4792291A · kind A · utility
2Cited by
2References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1987 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Sep 9, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L23/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The hydraulically powered fluid pump has a spool valve which controls the direction of travel of the pump. The spool valve is designed to switch between positions relatively slowly so that in between pump cycles, the ball checks associated with the pump may return under the force of gravity to their seats. This natural gravity return produces greatly decreased noise levels and increased seat life compared with the slamming action present in current pumps. The spool valve is viscous damped and of a closed centered construction to allow the relatively slow switchover to take place.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.