Positive-displacement pump
US5655891A · kind A · utility
10Cited by
8References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1995 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Jun 6, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S417/90
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The pump includes two pistons 10 each sliding in a cylinder 11. These are fed by a screw 21 through ports 12. Upon delivery, a rotary valve 6 turning in a bearing 1A2 in succession closes off and uncovers the passages 1A1 from the cylinders. This rotary valve 6 includes an axial bore 61 and a slot 62 through which the material collected from the cylinders passes in the direction of the outlet orifice of the pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.