Patent ID: 8267406

Claim:
A mechanical seal assembly for sterile applications comprising a seal ring and a retaining ring, the retaining ring comprising a recess inserted at a side of one of its axial ends for a sealing receipt and force-fit assembly of the seal ring, wherein an engaging ring made of a flexible material and having a corrugated profile at its inner periphery is retained in the recess, the corrugated profile having elevations configured to be brought in a force-fit engagement with an outer periphery of the seal ring when the seal ring is moved into the engaging ring by an external mounting force, wherein each elevation has a leading flange in direction (P) of the mounting movement having an inclination angle (α 2 ) larger than an inclination angle (α 1 ) of a lagging flange, wherein the inclination angle of the leading flange (α 2 ) and the inclination angle of the lagging flange (α 1 ) refer to the opening angle enclosed by a tangent toward the respective flange and the center longitudinal axis, opposite to the mounting movement direction (P), wherein the engaging ring includes a free surface that is flush with a radial surface of the retaining ring for providing a dead-spot-free engagement between the engaging ring and the retaining ring for sterile applications, and wherein the inner periphery of the engaging ring includes the corrugated profile on a first portion thereof and a corrugation-free portion engaged with the outer periphery of the seal ring for providing a dead-spot free engagement between the engaging ring and the seal ring.