Patent ID: 6962340

Claim:
A mechanical seal device for providing a seal between a high pressure process fluid side and a lower pressure side by developing a sealing contact between two seal faces of a first seal ring mounted on a rotary body and a second seal ring installed in a seal housing, said mechanical seal device comprising: a) a mating surface being retained by one of said seal rings and being fixedly installed in a step shoulder installation surface comprised of a radially extending surface and an axially extending circumferential surface; b) a seal face being located on the opposite side relative to said mating surface; c) a cup gasket being disposed between said mating surface of said seal ring and said step shoulder installation surface, a main body of said cup gasket being made of a resilient rubber material; and d) a support plate being disposed in the main body of said cup gasket in an integral manner, a support face of said support plate facing opposite relative to and approximately parallel with said mating surface of said seal ring; wherein a diameter of said support plate in said cup gasket extends in a range of from a diameter of an inner diameter surface of said seal ring to the diameter of an inner diameter surface of a through hole extending through said step shoulder installation surface; and wherein an inner diameter of said support plate in said cup gasket is smaller than an inner diameter of the main body of said cup gasket.