Liquid metering and transfer valve assembly
US4896546A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1989 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Jan 11, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotary liquid metering and transfer valve assembly for a diluting system which includes a pair of stationary valve disc elements sandwiching a central, rotatable valve disc element, said disc elements being coaxially aligned and mounted on a spindle. One of the outer stationary elements has a first external loop secured thereto, said loop having a precise interior volume. An aspirator probe is secured to the other of said stationary elements. The central element has formed therein an axial segmenting passageway having a precise interior volume. A second external loop is secured to the center element. The second loop extends outwardly, preferably radially, of said element and has a precise interior volume. Appropriate interior passageways are provided in the outer elements for directing a liquid sample in a continuous path through the valve assembly, the path including the one segmenting passageway and the first and the second external loops. Additional interior passageways also are provided for coupling the valve assembly to sources of diluent and to exterior destinations. The central element is rotated to isolate the contents of the segmenting passageway and of the first and the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.