Water filter cartridge and manifold head seal

An assembly including at least a manifold and barrel valve for a water filter cartridge for an appliance, the assembly having a longitudinal axis, the assembly comprising:

• a manifold comprising:
• a manifold head having a manifold wall defining a first generally cylindrical manifold inner surface centered on the longitudinal axis with a first manifold fluid passage passing through the manifold wall and opening onto the first manifold inner surface, the manifold head having a second generally cylindrical manifold inner surface centered on the longitudinal axis with a second manifold fluid passage through the manifold wall and opening onto the second manifold inner surface, the second manifold fluid passage spaced apart a distance along the longitudinal axis from the first fluid passage and below the first fluid passage;
• a middle manifold vent passage extending through the manifold wall and opening onto one of the first or second manifold inner surfaces;
• a barrel valve having a barrel valve wall, comprising:
• a first barrel valve wall portion having a first outer, generally cylindrical barrel valve surface sized to fit inside the first manifold inner surface and a second barrel valve wall portion having a second outer, generally cylindrical barrel valve surface sized to fit inside the second manifold inner surface, the first barrel valve wall portion having a first barrel valve fluid passage extending therethrough, the second barrel valve wall portion having a second barrel valve fluid passage extending therethrough and spaced apart a distance along the longitudinal axis below the first barrel valve fluid passage, the first and second barrel valve fluid passages having a first position in which the first and second barrel valve fluid passages do not overlap and are not in fluid communication with any portion of the first and second manifold fluid passages and having a second position rotated about the longitudinal axis in which the first and second barrel valve fluid passages are in fluid communication with the first and second manifold fluid passages, respectively, the barrel valve further having a middle barrel valve vent passage extending through the barrel valve wall between the first and second barrel valve fluid passages, respectively, the middle barrel valve vent passage having a first position that does not overlap with the middle manifold vent passage and having a second position that is in fluid communication with the middle manifold vent passage;
• a top barrel valve seal encircling the barrel valve and longitudinal axis and interposed between the first manifold inner surface and the first barrel valve outer surface and located above the first manifold fluid passage and above the first barrel valve fluid passage;
• a first, middle barrel valve seal encircling the barrel valve and longitudinal axis and interposed between the first manifold inner surface and the first barrel valve outer surface and located below the first manifold fluid passage and below the first barrel valve fluid passage;
• a second, first middle barrel valve seal encircling the barrel valve and longitudinal axis and interposed between the second manifold inner surface and the second barrel valve outer surface and located below the first middle barrel valve seal and above the second manifold fluid passage and above the second barrel valve fluid passage, the first and second middle barrel valve seals defining a middle barrel valve void volume between those first and second middle barrel valve seals and the facing surfaces of the barrel valve and manifold abutting those first and second middle barrel valve seals, the middle barrel valve vent passage opening onto the middle barrel valve void volume when the barrel valve is in at least the second position;
• a first lower barrel valve seal encircling the barrel valve and longitudinal axis and interposed between the second manifold inner surface and the second barrel valve outer surface and located below the second manifold fluid passage and below the first barrel valve fluid passage;
• a top fluid passage seal interposed between the first manifold inner surface and the first barrel valve outer surface and encircling the first barrel valve fluid passage when the barrel valve is in at least the second position;
• and
• a bottom fluid passage seal interposed between the first manifold inner surface and the first barrel valve outer surface and encircling the second barrel valve fluid passage when the barrel valve is in at least the second position.

A lateral filter cartridge for lateral connection with a filter manifold head having a flow inlet and a flow outlet, the filter cartridge having a longitudinal cartridge axis and a filter element located in a filter housing with the filter element in fluid communication with a filter inlet and filter outlet so that liquid from the manifold flow inlet passes through the filter inlet and filter and out the manifold outlet, the lateral filter cartridge comprising:

• a lateral filter cap having a first generally cylindrical portion with a first fluid passageway extending inward toward a longitudinal axis of the lateral filter cap, the lateral filter cap axis being in a plane orthogonal to the filter cartridge axis, the first fluid passageway forming one of the inlet or outlet of the filter cartridge, the lateral filter cap having a second generally cylindrical portion with a second fluid passageway extending inward toward the lateral filter cap axis and forming the other of the inlet or outlet of the lateral filter cartridge, the lateral filter cap having a closed end with the first generally cylindrical portion further from the filter axis than the second generally cylindrical portion, the first and second generally cylindrical portions having respective first and second outer diameters with the first outer diameter being smaller than the second outer diameter, the filter cap having a first internal cavity formed in part by the first generally cylindrical portion and in fluid communication with the first fluid passageway and extending along the lateral filter cap longitudinal axis along a length of the first and second generally cylindrical portions of the lateral filter cap, the filter cap having a second internal cavity extending along the second, generally cylindrical portion of the lateral filter cap and comprising an annular recess encircling the first internal cavity and extending along the filter cap longitudinal axis, the lateral filter cap connecting to a distal end of the filter housing enclosing the filter;
• first and second seal members encircling the outside of the first generally cylindrical portion on opposing sides of the first fluid passageway, respectively;
• and
• third and fourth seal members encircling the outside of the second generally cylindrical portion on opposing sides of the second fluid passageway, respectively, the second and third seal members being separated by a middle distance.