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US 12,643,727 B2Granted
Gland packing
AssigneeNippon Pillar Packing Co., Ltd.
InventorsKazuyoshi Sato, Takashi Kawasaki, Ryohei Murakami
Life of this patent
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Abstract
A seal layer of a gland packing is a tubular portion containing fluororesin, whose outer periphery is in closely contact with an inner periphery of a stuffing box, and whose inner periphery is in closely contact with an outer periphery of a movable shaft of a fluid device. One or more protective layers of the gland packing are annular portions containing no fluororesin. The protective layers cover at least an atmosphere-side axial end surface of the seal layer to prevent oxygen and moisture from entering the seal layer.
Claims6
A gland packing comprising:
- a seal layer that is a tubular portion containing fluororesin,
- whose outer periphery is in close contact with an inner periphery of a stuffing box, and
- whose inner periphery is in close contact with an outer periphery of a movable shaft of a fluid device;
- a protective layer that is an annular portion containing no fluororesin, and that covers an atmosphere-side axial end surface of the seal layer to prevent oxygen and moisture from entering the seal layer;
- and
- a metallic plate that covers an atmosphere-side axial end of the protective layer.
3 more elements
A gland packing comprising:
- a seal layer that is a tubular portion containing fluororesin,
- whose outer periphery is in close contact with an inner periphery of a stuffing box, and
- whose inner periphery is in close contact with an outer periphery of a movable shaft of a fluid device;
- a protective layer that is an annular portion containing no fluororesin, and that covers an atmosphere-side axial end surface of the seal layer to prevent oxygen and moisture from entering the seal layer;
- and
- a sacrifice member that is an annular member abutting an atmosphere side of the protective layer, and including sacrifice metal whose corrosion resistance to hydrogen fluoride is poorer than that of material of the movable shaft.
3 more elements
Dependencies are inferred from the claim text.