Sealing apparatus for an air suspension device, air suspension device, and method for sealing a primary volume in an air suspension device

An air spring device for commercial vehicles, comprising:

• an air bellows element;
• a piston element;
• a primary volume positioned between the air bellows element and the piston element;
• and
• a sealing apparatus configured to seal the primary volume of the air spring device with respect to a secondary volume, the sealing apparatus including a main body and a movable sealing element positioned on the circumference of the main body;
• wherein the sealing element is configured such that, in the mounted state the sealing element is movable from a sealed position where the sealing element seals the primary volume with respect to the secondary volume, to a released position where air passes the sealing element, when a pressure difference between the primary volume and the secondary volume exceeds a threshold value, wherein the pressure difference is set with respect to the secondary volume as a negative pressure in the primary volume, the air spring device having a connecting duct or the exchange of air between the primary volume and the secondary volume, the sealing apparatus being arranged in the connecting duct;
• and
• wherein a ratio between an outermost diameter of the main body to an outermost diameter of the sealing element is between 0.78 and 0.98.