A high pressure vessel sealing ring formed by an annular body made up of at least two parts, a polymer gasket and a sealing gasket, wherein the ring is in contact with the surface of a high pressure lid and with the surface of a vessel and includes at least a first part coupled by means of a mechanical stop to a second part which is concentric to the first part, where the radius of the second part is of the same or different size with respect to the radius of the first part.