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US 5,225,262 AGranted
Braided high-temperature packing comprising a core of folded flexible graphite sheet
AssigneeA. W. Chesterton Company
InventorRobert D. Leduc
Life of this patent
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Abstract
A high temperature, high pressure resistant packing (e.g., for the packing gland of a valve stem) has a core of density 1.3-1.6 gm/cc that includes a plurality of strands, each strand including a flexible graphite tape, longitudinally corrugated and folded into at least two longitudinally extending partially superimposed layers. Preferable, each strand is overknitted with a reinforcing wire, the strands in the core are braided, and a jacket, which includes a carbide fiber, an inorganic fiber, and a phenolic fiber, is disposed about the core.
Claims12
A packing core comprising:
- a plurality of strands, each said strand comprising flexible graphite tape, longitudinally corrugated and folded into at least two longitudinally extending layers integrally connected along a longitudinal edge thereof, said layers having at least a partially superimposed relationship to one another, each strand further comprising a reinforcing wire overknitted about said folded graphite tape;
- and
- a blocking agent dispersed in said strands;
- said core having a density of 1.3-1.6 gm/cc.
1 more element
A packing comprising:
- a core comprising a plurality of strands, each said strand comprising a flexible graphite tape, longitudinally corrugated and folded into at least two longitudinally extending layers integrally connected along a longitudinal edge thereof, said layers having at least a partially superimposed relationship to one another, each said strand further comprising a reinforcing wire overknitted about said folded graphite tape;
- said core further comprising a dispersed blocking agent therein;
- said core having a density of about 1.3 to 1.6 gm/cc;
- and
- an overbraided fiber jacket disposed about said core.
2 more elements
Dependencies are inferred from the claim text.