Fluid handling – Systems – Programmer or timer
Patent
1975-04-08
1976-06-22
Cohan, Alan
Fluid handling
Systems
Programmer or timer
222264, 222287, 73422TC, G01N 120
Patent
active
039645134
ABSTRACT:
A rotating sampling valve is described consisting of a rotating plate held between two fixed plates. The rotating plate contains a number of concentric channel sets bored through its longitudinal axis which channels are disposed symmetrically around its center axis. The channels in each set are of equal volume while the volume of channels in different sets can vary as desired. Both the upper and lower fixed plates contain the same number of correspondingly placed channels serving as inlets and outlets. Thus, when the center plate is rotated liquids flowing through the channels in the center plate are entrapped and transferred to a position indexing with different channels in the upper and lower plates. By connecting the desired inlet and outlet channels with selected sets of channels in the rotating plate it is possible to obtain varying sample volumes. This sampling valve is useful in obtaining discontinuous samples from column eluents for analytical assay such as, for example, fluorescence analysis of proteins, peptides and amino acids, or in other chemical analysis, process control and other purposes. Moreover it is possible to readily change the sample volumes obtained without replacement of the valve body.
REFERENCES:
patent: 2472092 (1949-06-01), Campbell
patent: 2865447 (1958-12-01), Kaufman
patent: 3067912 (1962-12-01), Neri
patent: 3080759 (1963-03-01), McQuaid
patent: 3885439 (1975-05-01), Stone
Cohan Alan
Gould George M.
Hoffmann-La Roche Inc.
Welt Samuel L.
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