Air turbine starter having a force balanced, pressure energized, weighted check valve
US7033134B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2004 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Jul 8, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7873
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air turbine starter is provided that includes a check valve assembly for placement between a first environment, at least a portion of which is at a first pressure (P1), and a second environment, at least a portion of which is at a second pressure (P2), wherein the difference between the first and second pressures generate a pressure force (Fp). The check valve assembly comprises a valve element disposed between the valve seat and the valve body, the valve element capable of being acted upon by a gravitational force (Fw), a viscous force of the fluid to be communicated between the gearbox assembly and the starter housing (Fv), a buoyancy force of the valve element (Fb), and the pressure force on the valve element (Fp), the valve element further configured to translate axially to a closed position when P2<P1 and Fw<Fv+Fb+Fp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.