Rotary seal assembly

A seal assembly for sealing two relatively rotatable coaxial parts comprising;

• inner and outer annular casings nested together and forming an S-shaped recess in cross section defining inner and outer C-shaped concavities;
• each of said annular casings having a free peripheral portion and a peripheral seal extending radially from said peripheral portion to flex against an inside sealing surface of the opposite annular casing, thereby forming sealing interfaces along circular lines of contact;
• said peripheral seals being attached to the respective peripheral portion by a substantially continuous adhesive ring;
• inner and outer annular wafer seals pressed within respective said inner and outer C-shaped concavities by an adjacent peripheral portion, each wafer seal having opposite peripheral edges that contact the adjacent sealing surface within said one respective concavity, thereby forming two additional sealing interfaces in each concavity;
• said wafer seals engaging the respective peripheral portion on a side of the casing opposite said adhesive ring;
• whereby the two peripheral seals and two wafer seals form a total of six sealing interfaces providing the sealing on both sides of said casings.