Abstract: A sealing system for separating two pressure zones includes: a shaft including a groove, which includes a plurality of groove sealing surfaces; a component; and a seal arranged between the shaft and the component, the seal being configured for moving axially in the groove, the seal including a plurality of sealing surfaces, wherein, based on a plurality of pressure conditions in the two pressure zones, the seal is configured for being moved into a first functional position or a second functional position, wherein the seal further includes a sliding region and a radial sealing surface including a diameter D that is adjustable elastically by the sliding region.