F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
26/161, 251/56
F16J 15/10 (2006.01) F16J 15/32 (2006.01) F16K 41/04 (2006.01)
Patent
CA 1265114
PRESSURE SEAL FOR VALVE STEMS AND THE LIKE ABSTRACT An improved elastomeric seal is provided for preventing both low or high pressure fluid from escaping past a rotatable valve stem or similar shaft. The annular seal comprises an outer generally envelope-shaped first plastic member for sealing engagement with the rotatable stem and valve bonnet, and an inner second plastic member substantially encapsulated by the first member. The annular legs of the envelope-shaped member are positioned downstream from fluid pressure, thereby sealing the inner second member from fluid attack. Novel techniques are employed for forming the elastomeric seal outside the valve bonnet by applying a substantial radially-directed force for deforming the first plastic member into the envelope configuration, while deforming the inner plastic member into an elliptical configuration. The seal in the substantially deformed configuration is then assembled within the bonnet cavity while preventing radial expansion of the envelope-shaped member.
507516
Borden Ladner Gervais Llp
General Screw Products Company
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