Filtration container assemblies and methods

A filtration container assembly, comprising:

• an outer container having a first open end and a second closed end and an inner wall extending between the first open end and the second closed end, the outer container defining an inner cavity;
• and
• a plunging assembly having a longitudinal axis and being configured to be received at least partially within the inner cavity of the outer container, wherein the plunging assembly includes an inner sleeve having a first end and a second end, an outer wall extending between at least a portion of the first end and the second end, and an inner bore, a filtration assembly in fluid communication with the inner bore, and a sealing device configured for forming a seal between the inner wall of the outer container and the plunging assembly, wherein the sealing device includes a seal disposed in a groove, the groove defined by a first annular surface and a second annular surface spaced from the first annular surface, the second annular surface defining a non-planar surface, wherein the plunging assembly is configured to filter a liquid as the liquid moves from the inner cavity of the outer container through the filtration assembly to the inner bore of the plunging assembly, and wherein at least a portion of the sealing device is movable between first and second positions, such that in the first position, the sealing device forms a seal between the outer container and the plunging assembly, and in the second position, the sealing device provides a fluid pathway between the outer container and the plunging assembly.

A method of filtering a liquid, comprising:

• filling an outer container at least partially with the liquid, wherein the outer container includes a first open end and a second closed end and an inner wall extending between the first open end and the second closed end, the outer container defining an inner cavity;
• inserting a plunging assembly at least partially into the inner cavity of the outer container, wherein the plunging assembly defines a longitudinal axis and an inner bore, wherein the plunging assembly includes an inner sleeve having a first end and a second end and an outer wall extending between at least a portion of the first end and the second end, a filtration assembly in fluid communication with the inner bore, and a sealing device configured for forming a seal between the inner wall of the outer container and the plunging assembly, wherein the sealing device includes a movable seal disposed in a seal channel, the seal channel defined by a first surface and a second surface spaced from the first surface, the first surface defining a planar sealing surface and the second surface defining a non-planar surface, and wherein the movable seal is movable between first and second positions, such that in the first position, the movable seal forms a seal between the outer container and the plunging assembly, and in the second position, the sealing device provides a fluid pathway between the outer container and the plunging assembly;
• and
• pressing the plunging assembly into the inner cavity of the outer container such that liquid moves from the inner cavity of the outer container through the filtration assembly to the inner bore of the plunging assembly.