Extrusion-resistant sealing ring

摘要

The invention relates to a sealing ring composed of tough and resilient or elastoplastic plastic or of an elastomer material, in which the zone adjoining the housing gap on the low-pressure side is configured in such a way as to prevent or delay the extrusion of the sealing ring into the housing gap at a high pressure of the fluid to be sealed off. According to the invention, the cross-section of the sealing ring D is configured to be considerably more resistant to extrusion by shaping a transitional surface Ü arranged between its end contact face and its conical or cylindrical circumferential surface that, when the pressure to be sealed off acts on the sealing ring it is under compressive stress in all directions and, as a result, has the supporting effect of an arch. For this purpose, the transitional surface is designed as a preferably concave annular surface recessed into the sealing ring. <IMAGE>