Abstract: An anti-rotation device is for a circumferential seal disposed within a housing and having an annular body and one or more openings with facing first and second sides. The device includes at least one and preferably a plurality of lugs each having a first axial end coupled with the housing, preferably through an annular carrier disposed within the housing, an opposing second axial end, inner and outer radial ends each extending axially between the first and second axial ends, and opposing first and second retainer surfaces extending axially between the first and second axial ends and radially between the inner and outer radial ends. At least one retainer surface is convexly curved and each lug is disposable within a seal opening such that the convexly curved retainer surface is contactable with one of the seal opening sides to prevent angular displacement of the seal with respect to the housing.

Abstract: An anti-rotation device is for a circumferential seal disposed within a housing and having an annular body and one or more openings with facing first and second sides. The device includes at least one and preferably a plurality of lugs each having a first axial end coupled with the housing, preferably through an annular carrier disposed within the housing, an opposing second axial end, inner and outer radial ends each extending axially between the first and second axial ends, and opposing first and second retainer surfaces extending axially between the first and second axial ends and radially between the inner and outer radial ends. At least one retainer surface is convexly curved and each lug is disposable within a seal opening such that the convexly curved retainer surface is contactable with one of the seal opening sides to prevent angular displacement of the seal with respect to the housing.

Abstract: A circumferential seal assembly for sealing about a rotatable shaft includes two or more generally arcuate bodies coupleable together to form a generally annular seal disposeable about a shaft outer surface. Each arcuate body has opposing female and male circumferential ends. Each female end includes a recess defined between a radially-inner arm and a radially-outer arm each extending generally circumferentially from a remainder of the arcuate body. Each male end includes a projection extending circumferentially from the remainder of the arcuate body and is sized to be disposeable within the recess of an adjacent arcuate body to couple the arcuate body with the adjacent arcuate body. Further, the female end inner arm of each arcuate body is disposed radially between the shaft outer surface and at least a portion of the male end projection of the adjacent arcuate body when the arcuate body is coupled with the adjacent arcuate body.

Abstract: A circumferential shaft seal segment includes a radial outer face, a radially inner face, a first axial face extending from the radial outer face to the radial inner face and a second axial face axially spaced from the first axial face and extending from the radially outer face to the radially inner face. The seal has a bleed slot in the radially inner face extending from the first axial face toward the second axial face, and there are first and second recesses in the radially inner face in communication with the bleed slot that extend from circumferentially opposite sides of the bleed slot.

Abstract: A ring seal for a shaft includes a plurality of arc-shaped ring segments, each of the plurality of ring segments having a radially outer face, a radially inner face, a first axial side face, a second axial side face, a first end and a second end, a spring holding the plurality of arc-shaped segments in an arch-bound configuration, and at least one circumferential ramp in the radially inner face of each of the plurality of ring segments configured to generate an air cushion when a shaft rotates inside the ring seal. Also a ring sealing system including the ring seal and a shaft.

Abstract: A ring seal for a shaft includes a plurality of arc-shaped ring segments, each of the plurality of ring segments having a radially outer face, a radially inner face, a first axial side face, a second axial side face, a first end and a second end, a spring holding the plurality of arc-shaped segments in an arch-bound configuration, and at least one circumferential ramp in the radially inner face of each of the plurality of ring segments configured to generate an air cushion when a shaft rotates inside the ring seal. Also a ring sealing system including the ring seal and a shaft.

Abstract: A circumferential shaft seal segment includes a radial outer face, a radially inner face, a first axial face extending from the radial outer face to the radial inner face and a second axial face axially spaced from the first axial face and extending from the radially outer face to the radially inner face. The seal has a bleed slot in the radially inner face extending from the first axial face toward the second axial face, and there are first and second recesses in the radially inner face in communication with the bleed slot that extend from circumferentially opposite sides of the bleed slot.