Abstract: A seal having a body portion, at least one lip portion extending from the body portion, and a protrusion formed on the at least one lip portion. The lip portion and protrusion formed thereon may each include an arcuate segment wherein the arcuate segment of the protrusion exhibits a smaller radius than the arcuate segment of the lip portion. The protrusion further includes a surface or a segment adjoining its arcuate segment on the intended fluid or upstream side of the seal. The segment of the protrusion on the intended fluid side may be configured to be substantially perpendicular with the surface of a machine element with which it comes in contact. The configuration and orientation of the protrusion enables the seal to apply an increased contact force over a reduced area, improving penetration of any fluidic film formed on the surface of the machine element and thereby reducing leakage.

Abstract: A seal having a body portion, at least one lip portion extending from the body portion, and protrusion formed on the at least on lip portion. The lip portion and protrusion formed thereon may each including an arcuate segment wherein the arcuate segment of the protrusion exhibits a smaller radius than the arcuate segment of the lip portion. The protrusion further includes a surface or a segment adjoining its arcuate segment on the intended fluid or upstream side of the seal. The segment of the protrusion on the intended fluid side may be configured to be substantially perpendicular with the surface of a machine element with which it comes in contact. The configuration and orientation of the protrusion enables the seal to apply an increased contact force over a reduced area improving penetration of any fluidic film formed on the surface of the machine element and thereby reducing leakage.

Abstract: A rod wiper for disposition about the rod of a fluid actuator comprises an annular wiper element of relatively high durometer having a pair of axially spaced lips engageable with the rod of the actuator, and an annular elastomeric element of relatively lower durometer disposed radially outwardly of said wiper element. The elastomeric element is normally engaged with only the wiper element and with an axial wall of a rod housing. However, the elastomeric element is movable into engagement with a radial wall of the rod housing in the presence of dirt and scale on the rod. The axial force on the elastomeric element results in an increased bias of the lips of the wiper element on the rod.