Abstract: A valve arrangement for adding air to the intake line of an internal combustion engine, particularly Otto-cycle engines, during the deceleration of the engine. A diaphragm which is controlled by intake pipe pressure, acts against the force of a spring and is located within a dosing or metering unit so as to divide the unit into two chambers. The diaphragm actuates the valve via a rod, and the two chambers are connected through a calibration and a check valve. The upper chamber can be vented through a bore or opening by means of a second diaphragm which is controlled by the intake pipe pressure and acts against the force of a spring. A barometer bellows determines the preload of the spring through a disc and a rod.