Abstract: A seal between a housing and a rotatable shaft is provided, comprising a first ring member generally concentric with a rotatable shaft, the first ring member being attachable to the shaft in a non-rotatable position relative to the shaft, the first ring member further having an annular self-lubricating sealing surface facing away from the first ring member; and wherein the sealing surface is adapted to face a fixed annular surface and to slidably and sealingly engage the fixed annular surface when the first ring member is biased toward the fixed surface. The self-lubricating surface may be provided on a sealing ring which is biased against the fixed surface. The self-lubricating surface, sealing ring and/or first ring member may be constructed of a fluoroplastic material such as glass filled polytetrafluoroethylene. The fixed surface may be provided on a second ring member, enabling the seal to function as a cartridge unit.

Abstract: A dynamic seal is provided, comprising a gland, fixedly connectible to a housing around a rotatable shaft and having a first side, facing interior of the housing; a second side, facing exterior of the housing; a center opening, communicating between the first and second sides; and having a diameter greater than that of the shaft; an annular inner face, countersunk into the second side adjacent to the center opening so as to form an interior groove between the shaft and the gland; an annular first flange, extending axially from the inner face; and at least one relief port, communicating between the interior groove and the exterior of the gland.

Abstract: A ring seal between a housing and a rotatable shaft comprising a plurality of ring members generally concentric with the shaft. A first ring member is provided having an outer annular surface facing externally of the housing, an inner annular surface facing internally of the housing and an annular recess in the inner surface. A flange is provided in the first member, projecting radially inward into the annular recess, thus forming an annular channel in the first member. An opening is provided, opening from the lowest point in the channel of the first member to the outer surface. The first member is fixedly attachable to the housing so as to allow for free rotation of the shaft within the first member. A second ring member is positioned axially internal to the first member and is provided with an outer annular surface facing the inner surface of the first member and an inner annular surface facing internally of the housing.

Abstract: A ring seal between a housing and a rotatable shaft comprising a plurality of ring members generally concentric with the shaft. A first ring member is provided having an outer annular surface facing externally of the housing, an inner annular surface facing internally of the housing and an annular recess in the inner surface. A flange is provided in the first member, projecting radially inward into the annular recess, thus forming an annular channel in the first member. An opening is provided, opening from the lowest point in the channel of the first member to the outer surface. The first member is fixedly attachable to the housing so as to allow for free rotation of the shaft within the first member. A second ring member is positioned axially internal to the first member and is provided with an outer annular surface facing the inner surface of the first member and an inner annular surface facing internally of the housing.