Compact stem set with load-balanced rollers for non-lubricated double block and bleed plug valves
US6276394A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2000 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Jul 11, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8275
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In the stem set configuration for a double block and bleed plug valve, the improvement provides an operator which can be significantly shorter and more compact than conventional operators for such valves. The invention makes use of a novel nesting of the threading section whereby a conventional female thread is replaced by a nested male thread surrounded by the translation section. The translation section, in turn, houses the indication section inboard of the nested male threads thereby compacting three functions into one location. This design lends itself nicely to investment casting technology obviating conventional machine shop practices. The invention also combines by use of a long plug stem pin, the plug connection and L slot functions into one location. The input function still remains separate, however, combining ultimately all functions in only three discrete locations and what appears at this time to be the ultimate compacted or nested arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.