Patent ID: 7992589

Claim:
A valve, comprising: a body delimiting first and second ducts which open into a third duct and wherein the first duct is provided with a first butterfly valve element and the second duct is provided with a second butterfly valve element, wherein the first butterfly valve element is mounted on a first transmission gearwheel connected to an output shaft of a drive motor in order to be movable between a first closed position and a second closed position, wherein the first closed position is situated on a first side of an open position of the first duct and the second closed position is situated on a second side of the open position of the first duct, and wherein the second butterfly valve element is mounted on a second transmission gearwheel connected to the drive motor and is configured to pivot, wherein the second butterfly valve element is connected to the second transmission gearwheel by a one-way positive drive element when the first butterfly valve element is moved from an open position to the second closed position, which drives the second butterfly valve element from a closed position of the second duct to an open position of the second duct, wherein the valve comprises a member for returning the second butterfly valve element to the closed position when the first butterfly valve element is moved to the first closed position.