Patent ID: 8720899

Claim:
A seal assembly configured to extend circumferentially about a shaft, the seal assembly comprising: a housing defining an interior cavity open towards a central axis of the seal assembly; a sealing element configured to move radially within the interior cavity in a manner to maintain sealing contact, the sealing element disposed within the interior cavity of the housing; a first seal disposed in contact with and between the sealing element and the housing, the first seal maintaining sealing contact to limit fluid flow between the sealing element and the housing; a first element configured to move axially within the interior cavity in a manner to maintain sealing contact, the first element disposed within the interior cavity of the housing; a second seal disposed between the first element and the sealing element, the second seal maintaining sealing contact to limit fluid flow between the sealing element and the first element during radial motion of the sealing element relative to the first element; a spring disposed in contact with the first element, the spring configured to bias the first element towards sealing contact with the sealing element such that first element and the second seal maintain sealing contact during axial movement of an end face of the sealing element; and a third seal disposed between the first element and the housing, the third seal maintaining sealing contact to limit fluid flow between the housing and the first element.