Claims
- 1. A packing for a stuffing box comprising:at least one center ring; and an end ring, responsive when axial compressive force is applied to the packing, for forcing the material adjacent one radial edge of a first end of one the at least one center ring to move axially and radially in a direction away from the at least one center ring and for further compressing the material into an impervious and effective seal, the end ring comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock.
- 2. The packing of claim 1 wherein a first end of the end ring forms an ID seal and wherein acute angles are formed in the axially inner direction, and wherein the acute angles of the at least one center ring and end ring facing surfaces are about 45° and 60°, respectively.
- 3. The packing of claim 1 wherein the end ring has a high resistance to extrusion and abrasion.
- 4. The packing of claim 1 wherein the end ring both supports the at least one center ring and wipes a valve stem.
- 5. The packing of claim 1 wherein the at least one center ring comprises:three low density graphite preform rings having angled facing surfaces operatively positioned between two end rings.
- 6. The packing of claim 1 wherein the at least one center ring comprises:at least two low density graphite preform rings; and at least one additional ring operatively positioned therebetween, the at least one additional ring comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock having angled facing surfaces operatively positioned between two end rings.
- 7. The packing of claim 1 wherein the at least one center ring comprises:at least three low density graphite preform rings having angled facing surfaces operatively positioned between two end rings; and at least one additional ring operatively positioned between adjacent low density preform rings, the at least one additional ring comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts operatively dispersed throughout the braided graphite tape stock having angled facing surfaces operatively positioned between two end rings.
- 8. The packing of claim 1 wherein the at least one center ring comprises:one low density graphite preform ring having angled facing surfaces operatively positioned between two additional rings, the additional rings being operatively positioned between two end rings, the additional rings comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock having angled facing surfaces operatively positioned between two end rings.
- 9. The packing of claim 1 wherein the at least one center ring comprises:at least three rings, each of the rings comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock having angled facing surfaces operatively positioned between two end rings.
- 10. The packing of claim 1 wherein the inserts in the braided graphite tape stock comprise:strips, wires, filaments or tinsels of metal capable of performing the support spacer and wiper functions.
- 11. The packing of claim 10 wherein the metal is selected from the group comprising:steel, copper, brass, aluminum and zinc.
- 12. The packing of claim 1 wherein the end ring comprises: metal-inserted conformable braided stock with nickel-chromium alloy stainless steel.
- 13. The packing of claim 1 wherein the inserts rigidly hold and conform the end rings into virtually any desired shape.
- 14. The packing of claim 1 wherein each end ring is die formed at compressive loading values within a range of from about 750 psi to about 38,000 psi.
- 15. A packing for a stuffing box comprising:at least two low density center rings; at least one additional ring operatively positioned therebetween, the at least one additional ring comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock, having angled facing surfaces; and an end ring, responsive when axial compressive force is applied to the packing, for forcing the material adjacent one radial edge of a first end of one of the at least two low density center rings to move axially and radially in a direction away from one of the at least two center rings and for further compressing the material into an impervious and effective seal, the end ring comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock.
- 16. The packing of claim 15 wherein a first end of the end ring forms an ID seal wherein the acute angles are in the axially inner direction, and wherein the acute angles of the at least one center ring and end ring facing surfaces are about 45° and 60°, respectively.
- 17. The packing of claim 15 wherein the end ring has a high resistance to extrusion and abrasion.
- 18. The packing of claim 15 wherein the end ring both supports the at least one center ring and wipes a valve stem.
- 19. The packing of claim 15 wherein the inserts in the braided graphite tape stock comprise:strips, wires, filaments or tinsels of metal capable of performing the support spacer and wiper functions.
- 20. The packing of claim 15 wherein the end ring comprises: metal-inserted conformable braided stock with nickel-chromium alloy stainless Steel.
- 21. A packing for a stuffing box comprising:at least three low density graphite perform rings having angled facing surfaces operatively positioned between two end rings; at least one additional ring operatively positioned between adjacent low density preform rings, the at least one additional ring comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock having angled facing surfaces; and an end ring, responsive when axial compressive force is applied to the packing, for forcing the material adjacent one radial edge of a first end of one of the at least three low density center rings to move axially and radially in a direction away from one of the at least three center rings and for further compressing the material into an impervious and effective seal, the end ring comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock.
- 22. The packing of claim 21 wherein a first end of the end ring forms an ID seal wherein the acute angles are in the axially inner direction, and wherein the acute angles of the at least one center ring and end ring facing surfaces are about 45° and 60°, respectively.
- 23. The packing of claim 21 wherein the end ring has a high resistance to extrusion and abrasion.
- 24. The packing of claim 21 wherein the end ring both supports the at least one center ring and wipes a valve stem.
- 25. The packing of claim 21 wherein the inserts in the braided graphite tape stock comprise:strips, wires, filaments or tinsels of metal capable of performing the support spacer and wiper functions.
- 26. The packing of claim 21 wherein the end ring comprises: metal-inserted conformable braided stock with nickel-chromium alloy stainless steel.
- 27. The packing of claim 21 wherein each end ring is die formed at compressive loading values within a range of from about 750 psi to about 38,000 psi.
- 28. A packing for a stuffing box comprising:a center ring assembly, the center ring assembly comprising: one low density graphite preform ring having angled facing surfaces; two preform support rings, the low density graphite preform ring being operatively positioned between the two preform support rings, the two preform support rings comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock; and an end ring, responsive when axial compressive force is applied to the packing, for compressing the material into an impervious and effective seal, the end ring comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock.
- 29. The packing of claim 28 wherein each end ring is die formed at compressive loading values within a range of from about 750 psi to about 38,000 psi.
- 30. A packing for a stuffing box comprising:at least three center perform rings, the at least three center preform rings comprising: braided graphite tape stock having angled facing surfaces and having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock; and at least two end ring, responsive when axial compressive force is applied to the packing, for forcing the material adjacent one radial edge of a first end of one of the at least the center rings to move axially and radially in a direction away from one of the at least three center rings and for further compressing the material into an impervious and effective seal, the at least two end rings comprising: braided graphite tape stock having a density of at least about 1.8 g/cc; and inserts, operatively dispersed throughout the braided graphite tape stock.
RELATED APPLICATION
This application is a continuation-in-part of commonly owned U.S. patent application Ser. No. 08/620,406, filed Mar. 22, 1996, of Harrelson, now U.S. Pat. No. 5,806,858 the disclosure of which is herein incorporated by reference.
US Referenced Citations (11)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0 227 474 |
Dec 1986 |
EP |
2 287 772 |
Sep 1995 |
GB |
WO 9735129 |
Sep 1997 |
WO |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
08/620406 |
Mar 1996 |
US |
Child |
09/152768 |
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US |