Forged valve stem packing set
US6273431A · kind A · utility
18Cited by
12References
30Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1999 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Nov 15, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K41/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A three-ring packing set for a forged valve stem is disclosed which includes upper and lower adapter rings formed from fiber reinforced graphite tape and each having a first density and a first axial thickness, and an intermediate preform ring formed from graphite tape and having a second density that is less than the density of the upper and lower adapter rings and a second axial thickness that is less than the axial thickness of each of the adapter rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.