Stem packing assembly for gate valves and means for removal
US4135546A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1977 |
| Grant date | Jan 23, 1979 |
| Priority date | — |
| Expiry date | Apr 20, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/6089
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A packing assembly is arranged between a gate valve stem connected to an actuator and a bonnet secured to the valve body. An externally threaded packing sleeve is threaded within the bonnet and has the packing assembly removably connected thereto for movement with the sleeve. The packing sleeve has an outer end portion which extends into an easily disassembled actuator body where it is easily accessible to a removal tool for replacing the packing. The valve stem has a beveled shoulder thereon which engages a flexible inner flange on the bonnet in the closed position of the gate valve to provide a tight metal-to-metal surface contact between the shoulder and flange.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.