Top-loaded rotary valve with elliptical sealing

A valve system, comprising;

• a valve cartridge, the valve cartridge including:
• a lower cylinder portion that includes a first open end, a first base, and a first flow opening;
• an upper cylinder portion that includes a second open end, a second base, and a second flow opening, wherein the lower cylinder portion and the upper cylinder portion are joined along the first open end and the second open end such that an axis of the lower cylinder portion and an axis of the upper cylinder portion are aligned on a common cylinder axis and the first flow opening and the second flow opening are aligned along a common flow axis;
• and
• a disc mounted for rotation about the common cylinder axis within the valve cartridge, wherein the disc has an elliptical perimeter, and
• wherein the disc rotates between an open position that permits flow between the first flow opening and the second flow opening and a closed position that prevents flow between the first flow opening and the second flow opening.