Liquid chromatograph apparatus with a switching valve

Details Liquid chromatograph apparatus with a switching valve Liquid chromatograph apparatus with a switching valve

1998-07-13

1999-09-28

Therkorn, Ernest G.

Liquid purification or separation

With means to add treating material

Chromatography

210659, B01D 1508

Patent

active

059582278

ABSTRACT:
A liquid chromatograph apparatus has a precolumn and an analyzing column which are connected through a 8-port-two-position-switching valve wherein the switching valve is capable of switching between two movable positions wherein a flow path for a solvent directing from the precolumn to the analyzing column is formed in one of the two movable positions; a flow path for the solvent directing from the analyzing column to the precolumn is formed in the other of the two movable positions, and the flow paths formed in the two movable positions are such that flowing directions of the solvent in the precolumn are opposite and flowing directions of the solvent in the analyzing column are the same.

REFERENCES:
patent: 4017262 (1977-04-01), Small
patent: 4452067 (1984-06-01), Ahlstrom, Jr. et al.
patent: 4567753 (1986-02-01), Miller, Jr. et al.
patent: 4577492 (1986-03-01), Holba et al.
patent: 5071547 (1991-12-01), Cazer
patent: 5547497 (1996-08-01), Klemp
patent: 5567307 (1996-10-01), Karmarkar
patent: 5652398 (1997-07-01), Johnson

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