Importance

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Abstract

A sealing assembly, designed primarily for both very low and high pressure sealing of a rod while either stationary or reciprocating, comprising a first sealing ring having a generally Y-shaped cross-sectional configuration and a second sealing ring having a generally L-shaped cross-sectional configuration. One arm of the Y-shaped sealing ring seals in the static mode. The other arm seals in the static mode and also serves as a wiper arm wiping fluid off the surface of the reciprocating rod in the dynamic mode. This wiper arm is provided with a sharp wiping edge which in cooperation with the L-shaped sealing ring maintains both a higher loading per unit area and a high rate of pressure rise at the contact with the rod for maximum leakage control at both low pressure and high pressure. The L-shaped sealing ring also restricts and controls the deformation of the wiper arm so as to maintain an optimum contact area between the wiper and rod surface thereby minimizing friction and wear therebetween. The Y-shaped sealing ring is preferably made of a relatively flowable material such as rubber while the L-shaped sealing ring is preferably made of polytetrafluorethylene to provide good sealing characteristics and low friction at high pressures. The seal is designed to take advantage of the good characteristics of rubber and polytetrafluorethylene while retaining almost none of the disadvantages of either.

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First Claim