Patent ID: 7757962

Claim:
A thermostatic assembly for opening and closing one or more apertures used for controlling the flow of a coolant fluid, the thermostatic assembly comprising: a housing; a first fixed element fixed interconnected to the housing; first and second moveable elements moveably interconnected to the housing; a fluid path passing through the fixed element, the fluid path being open and closed in response to movement of the moveable elements relative to the fixed element such that when the moveable elements are in a first position the fluid path is closed and the coolant fluid is prevented from exiting the housing and when the moveable elements are in a second position the fluid path is open and the coolant fluid exits the housing; a temperature responsive element coupled to the moveable elements for moving the moveable elements between the first position and the second position, the temperature responsive element being a bi-metal element; wherein the first moveable element selectively opens and closes at least two apertures of the first fixed element and the second moveable element selectively opens and closes at least two apertures of the first fixed element to control the flow of a fluid through the first fixed element such that the fluid pressure does not tend to bias the first and second moveable elements into an open position or a closed position; wherein the first fixed element includes a stationary housing with two or more apertures; the first moveable element includes an internal rotor that seals one or more apertures and the second moveable element includes an external rotor that seals the same number of apertures as the internal rotor; and a shaft connecting the internal and external rotors with the temperature responsive element.