Patent ID: 7850088

Claim:
A thermostatic water mixing valve comprising: a base having a hot water inlet, a cold water inlet and mixed water outlet, the base further having a peripheral sidewall with an upwardly extending engaging member; a lower disk positioned on the base, the lower disk having a hot water inlet, a cold water inlet and a central opening, the lower disk further having a peripheral notch that receives a lower portion of the engaging member of the base; an upper disk rotatably positioned on the stationary disk, the upper disk having a hot water inlet, a cold water inlet and a central opening, the upper disk further having a peripheral channel that receives an upper portion of the engaging member of the base; a cap coupled to the upper disk, wherein the cap and the upper disk rotate as a unit with respect to the lower disk, the cap having a hot water cavity and cold water cavity positioned about a central opening; a cartridge assembly; and, internal mixing chamber.