Packing nut for control valve
US7980530B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2005 |
| Grant date | Jul 19, 2011 |
| Priority date | — |
| Expiry date | Dec 3, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/6069
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A packing nut assembly for a control valve having a valve body and a valve stem includes a packing box arranged for operative coupling to the valve body and having a primary bore sized to receive the valve stem and first and second counterbores. The first counterbore is sized to receive valve packing and the second counterbore includes internal threads. A packing nut having a central bore is sized to receive the valve stem and includes a threaded outer surface positioned to engage the second counterbore of the packing box. The packing nut includes an adjustment surface positioned to face the first counterbore, and includes an adjustment head having a plurality of tool-receiving apertures sized to receive an adjustment tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.