Dual seal fire safe stem packing orientation
US10036485B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2016 |
| Grant date | Jul 31, 2018 |
| Priority date | — |
| Expiry date | Jul 16, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/6069
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve with a packing assembly can include a first stem packing circumscribing a first portion of a valve stem, forming a seal between the valve stem and a valve body assembly, and being located in the second bore portion. A first packing retainer can have a collar that limits axial movement of the first stem packing and a first retainer body defining an inner cavity. A second stem packing can circumscribe a second portion of the valve stem and be located in the inner cavity of the first packing retainer. A second packing retainer can limit axial movement of the second stem packing. A piston member can be located axially between the first stem packing and the second stem packing, the piston member being moveable to apply axial force to one of the first stem packing and the second stem packing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.