Packing gland assembly
US4177998A · kind A · utility
25Cited by
9References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1978 |
| Grant date | Dec 11, 1979 |
| Priority date | — |
| Expiry date | Aug 25, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K41/003
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A packing assembly for a valve shaft or stem (8) consisting of inner and outer telescoping expander sleeves or rings (44, 46) slidably received intermediately in a stuffing box (32) between two groups of elastomeric sealing rings (F, G). Semi-fluid plastic sealing material is injected (60) between the expander rings to move them apart and thereby axially compress and radially expand the seal rings into sealing engagement with the stem or shaft and box wall. Portions of the plastic material pass through radial holes in the inner expander ring to form secondary seals within and about these rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.