Abstract: A fluid seal device for use in sealing an annular space between an internal surface of a cylinder and a member therein having an outer cylindrical surface and being formed at least in part from rubber. An oleamide additive is included in the rubber compound comprising about 1.0%–5.0% by weight of oleamide. The oleamide additive to the rubber of the fluid seal device results in a reduced coefficient of friction and low speed vibration as well as enhanced abrasion resistance.

Abstract: An improved fluid seal device or pressure seal of the type suitable for uses such as sealing an annular space between an internal surface and a member having an outer cylindrical surface is described. The seal includes a reinforced body formed of fabric reinforced rubber and at least one dynamic lip made substantially of rubber. The lip protrudes from the seal so that a small portion of the lip contiguous to the body of the seal and containing fabric reinforcement is contacted by the movable member in addition to the movable member contacting the resilient portion of the lip. The resilient portion of the lip hinges along the interface between the resilient portion and the fabric reinforced portion to control break-away frictional forces between the seal and the member.

Abstract: A fluid seal device comprising an annular body having an inner side, an outer side, a closed end face and an at least partly open end face wherein the at least partly open end face defines a first radial sealing area protruding outwardly from the outer side and a second radial sealing area protruding outwardly from the inner side of the annular body so that the plane defined by the first radial sealing area is spaced apart a further distance from the closed end of the annular body than the plane defined by the second radial sealing area. The at least partly open end face of the fluid seal device defining the first and second radial sealing areas is formed of a less rigid elastomeric material than the remaining portion of the annular body of the fluid seal device so that the radius of the second radial sealing area will tend to hinge and roll and to thereby maintain a generally constant resistance during movement of an element in contact therewith.

Abstract: A guided split packing ring comprising a split in the circumference of the annular body defining a nose at one end and a cavity at the other end for matingly receiving the nose therein. The annular body of the packing ring defines a slightly enlarged outside diameter having an interference between about 0.025 to 0.035 inches when the packing ring is positioned in a hydraulic cylinder so as to urge the ends of the split into sealing engagement.