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Abstract

An improved liquid filtering assembly used in applications such as filtering solvents for use in a liquid chromatography system. The filter assembly uses a filter cup having a large surface area which can be quickly removed and changed. The filter assembly also allows for the liquid to be drawn close to the bottom of the liquid reservoir. The filter assembly includes a coupling nut into which the tubing is secured on one side and an expansion member is secured on the other side. A seal ring is located around a portion of the expansion member. The expansion member urges the seal ring against the interior surface of the filter cup to secure the filter cup to the filter assembly. When the filter cup becomes clogged, the expansion member can be loosened to allow an operator to remove the clogged filter cup, replace it with a new filter cup, and then tighten the expansion member. Thus, the filter assembly can be reused simply by replacing the filter cup.

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First Claim