Seal ring for valve stem

Details Seal ring for valve stem Seal ring for valve stem

1994-09-30

1995-12-05

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277205, F16J 1532

Patent

active

054722160

ABSTRACT:
A seal assembly for a valve stem has a primary seal ring with a relatively rigid gland member having an annular base of generally rectangular cross-section and a pair of flexible sealing lips formed in one piece with the base and extending outwardly from one side thereof. The sealing lips define a cavity for an elastomeric expander ring. The expander ring is disposed within the cavity and retained therein by the sealing lips. Each sealing lip has a sealing edge on the outer surface thereof which is pre-loaded against the valve stem and the valve housing when the primary seal ring is installed around the valve stem. Each sealing lip has a flared angle which narrows down to a thickness of between 0.033 and 0.041 inches along the length of the sealing lip between the base and the sealing edge. The expander ring also has a maximum cross-sectional dimension at substantially the midpoint of the expander ring in a direction normal to the central axis of the seal ring which is between 74% and 96% of the nominal cross-section between the valve stem and the valve housing, and each of the sealing lips has a maximum radial dimension about a plane through the midpoint and normal to the central axis which is between 2% and 13% of the nominal cross-section between the valve stem and the valve housing. The primary sealing ring with these dimensions provides enhanced sealability, reliability and dependability.

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