Flapper closure mechanism
US6877564B2 · kind B2 · utility
20Cited by
32References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2002 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Oct 24, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7898
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A closure mechanism for a flapper features a pinion on the ear extending from the flapper that is used to mount it for pivotal movement. A spring-loaded rack meshes with the pinion or pinions on the flapper so that when the flow tube swings the flapper open, rotation of the pinion teeth advances the teeth on the rack against the force of a spring. When the flow tube is retracted, the spring pushes the teeth on the rack in the opposite direction causing a rotational movement of the flapper toward closure in contact with a conforming seat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.