Abstract: In a rotary end face seal for fluid pumps or the like including a housing adapted to be received within a seal counterbore, a primary seal ring with an end face portion adapted to engage a mating ring, a spring element urging the primary seal ring axially outwardly of the housing in a first direction, and an elastomeric sleeve providing a secondary seal between the housing and the seal ring. The seal also includes a seal ring holder and drive unit which includes radially inwardly directed drive surfaces adapted to engage counterpart outwardly directed drive faces on the primary seal ring, with both of the ring and the drive unit surfaces extending axially to permit free but limited axial movement of said primary seal ring.

Abstract: A resilient diaphragm separates one side of the rotary seal, such as is used to seal the space between a rotatable shaft and an adjacent surface of a machine housing through which the shaft extends. The seal assembly employs a casing which is secured to the housing and contains, or has adjacent thereto, parts of the seal including a sealing ring or pad which has rubbing contact with a pad on the housing. The sealing ring which, in turn, retains certain parts of the assembly, is held to the casing by means of an annular flange engaged behind a flange of the casing by the use of resilient parts put together with a snap fit. That is, the flange of the sealing ring is forced past the flange of the casing while both parts undergo momentary deformation. Thereafter the sealing ring is semi-permanently retained in the assembly by the casing flange. The present invention has reference to improvements in the resilient diaphragm which isolates one side of the rubbing surfaces from the other side.