Abstract: A gas seal assembly which in one embodiment comprises a seal ring having a plurality of annularly spaced-apart geometric impressions which cooperate with another seal ring having an annular groove into which opens a plurality of fluid pathways, the pathways placing the space between the sealing faces in fluid communication with an annular space defined by, inter alia, the sealing rings and a seal housing which contains the seal rings. The assembly enables a gas in the annular space to be recirculated between the annular space and the space between the seal faces to facilitate separation of the seal faces when sufficiently rotated relative to one another. In another embodiment, the gas seal assembly comprises a rotary seal ring disposed between two stationary seal rings. Methods of sealing the opening between a rotary shaft and an object through which the shaft extends are also disclosed.

Abstract: Split mechanical seal assemblies which include a pressurized fluid barrier and multiple concentric and axially aligned stationary seal rings. The stationary seal rings are in sealing relation with a rotary seal ring at their respective seal faces, and with the gland of the mechanical seal assembly, thereby forming an annular cavity for pressurized fluid to create a positive fluid pressure barrier across the seal faces when in sealing contact with each other. The axially and concentrically aligned stationary seal rings comprise an inner stationary seal ring and an outer stationary seal ring, and the area of the axially extending portion of the outer surface of the outer seal ring partially defining the annular cavity is greater than the area of the axially extending portion of the inner surface of the outer seal ring partially defining the annular cavity. The split configuration of the seal assembly facilitates quick installation, removal and maintenance of the seal assembly and its component parts.