Valve, notably engine control valve, comprising: - at least three paths (2, 9, 11) opening into a common interior space, - a metering flap able to pivot in a first path in order to vary the cross section for the passage of a fluid along the latter, - a routing flap able to pivot between a position in which it closes off a second path and a position in which it closes off a third path, - a common device for actuating the flaps (10, 12), the actuating device comprising at least one actuating wheel movable in rotation to cause at least one of the flaps that are the routing flap and the metering flap to pivot, the actuating device having at least a first configuration in which the metering flap is in a position for closing off the first path and in which the routing flap is in an intermediate position in which it is neither in the position for closing off the second path nor in the position for closing off the third path, and the actuating device being configured so that rotation of the actuating wheel when the actuating device is in the first configuration leads: - in a first phase, to significant pivoting of the routing flap while the metering flap is subjected only to a small amount of pivoting, and - in a second phase subsequent to the first phase to the pivoting of the metering flap in order to modify the cross section for the passage of fluid along the first path without the position of the routing flap being modified, the valve being characterized in that the actuating device is configured so that rotation of the actuating wheel while the actuating device is in the first configuration causes the metering flap to pivot in just one single same direction of rotation regardless of the direction of rotation of the actuating wheel. - at least three paths (2, 9, 11) opening into a common interior space, - a metering flap able to pivot in a first path in order to vary the cross section for the passage of a fluid along the latter, - a routing flap able to pivot between a position in which it closes off a second path and a position in which it closes off a third path, - a common device for actuating the flaps (10, 12), the actuating device comprising at least one actuating wheel movable in rotation to cause at least one of the flaps that are the routing flap and the metering flap to pivot, the actuating device having at least a first configuration in which the metering flap is in a position for closing off the first path and in which the routing flap is in an intermediate position in which it is neither in the position for closing off the second path nor in the position for closing off the third path, and the actuating device being configured so that rotation of the actuating wheel when the actuating device is in the first configuration leads: - in a first phase, to significant pivoting of the routing flap while the metering flap is subjected only to a small amount of pivoting, and - in a second phase subsequent to the first phase to the pivoting of the metering flap in order to modify the cross section for the passage of fluid along the first path without the position of the routing flap being modified, the valve being characterized in that the actuating device is configured so that rotation of the actuating wheel while the actuating device is in the first configuration causes the metering flap to pivot in just one single same direction of rotation regardless of the direction of rotation of the actuating wheel. - in a first phase, to significant pivoting of the routing flap while the metering flap is subjected only to a small amount of pivoting, and - in a second phase subsequent to the first phase to the pivoting of the metering flap in order to modify the cross section for the passage of fluid along the first path without the position of the routing flap being modified, the valve being characterized in that the actuating device is configured so that rotation of the actuating wheel while the actuating device is in the first configuration causes the metering flap to pivot in just one single same direction of rotation regardless of the direction of rotation of the actuating wheel.