the invention relates to an air bellows for a pneumatic spring , in particular of a commercial vehicle , the air bellows including an axle - side region and a body - side region , wherein the axle - side region is arranged on a plunger and movable by a compression or extension movement between a first , compressed position and a second , extended position , and further including an interior space adapted to be filled with compressed air via a compressed air opening that is connectable to a compressed air line . the air bellows further comprises a valve connected to the atmosphere for ventilating the interior space , wherein by applying compressed air present in the interior space to the valve the valve is moved to a closed position .