Patent ID: 8297305

Claim:
A valve assembly suitable to control a flow of a first fluid supply, but not more than one fluid supply at a time, the valve assembly comprising: a valve housing having an internal bore, wherein both an inlet port and an outlet port extend between the internal bore and an exterior of the valve housing; a valve cartridge positioned in the internal bore, the valve cartridge being suitable to control volume of fluid flow from the inlet port to the outlet port if a supply of a fluid is supplied to the inlet port; wherein the valve cartridge has: a stationary disk positioned over both the inlet port and the outlet port, wherein the stationary disk has an inlet aperture and an outlet aperture; a movable disk positioned over the stationary disk and having a cavity on its bottom side; and a rotatable valve stem operationally linked to the movable disk such that rotation of the valve stem can cause rotation of the movable disk over the stationary disk, with the movable disk as a result moving between a first position that prevents fluid flow between the inlet port and the outlet port, and a second position where fluid flow from the inlet port, if the inlet port is supplied with fluid, is permitted to pass up through the inlet aperture, through a portion of the cavity, down through the outlet aperture and into the outlet port; wherein the cavity has a partition wall; and wherein an upper portion of the cavity is concavely contoured along a continuously arced surface extending transversely from the partition wall to facilitate fluid flow between the inlet aperture and the outlet aperture when the partition wall is rotationally positioned so as not to prevent such flow.