Liquid chromatographic pump and valve assembly

Details Liquid chromatographic pump and valve assembly Liquid chromatographic pump and valve assembly

1997-06-16

1999-07-06

Noland, Thomas P.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

73 6155, G01N 3018, G01N 3020, G01N 3022

Patent

active

059200065

ABSTRACT:
The disclosed HPLC syringe or pump has valve components housed immediately adjacent a defined pump chamber, effectively minimizing dead flow passage spaces and the needed volume of flushing liquid between tests. The mated surfaces of the valve components are biased together with forces substantially proportional to the pumped liquid pressures, and the drive for moving the syringe chamber piston also and concurrently shifts the valving components before driving the piston in the pump chamber, effectively minimizing leakage while allowing valve shifting without excessive wear. The chamber piston drive is comprised of concentrically positioned lead screw and pump cylinder structure keyed to the valve components. Spaced seals isolate the defined pump chamber from the piston drive lead screw for minimizing damaging solvent contact with the screw, and passages allow for flushing the pump chamber walls between the seals of solvent left thereon to minimize solvent crust buildup thereon.

REFERENCES:
patent: 3847507 (1974-11-01), Sakiyama et al.
patent: 3922115 (1975-11-01), Coe et al.
patent: 4102782 (1978-07-01), Saito et al.
patent: 4233156 (1980-11-01), Tsukada et al.
patent: 4311856 (1982-01-01), Boldvin et al.
patent: 4406158 (1983-09-01), Allington
patent: 4883409 (1989-11-01), Strohmeier
patent: 4939943 (1990-07-01), Struhmeier
patent: 4980296 (1990-12-01), Trisciani et al.
patent: 5637208 (1997-06-01), Dourdeuille
patent: 5846832 (1998-12-01), Oetner et al.

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