Adjustable orifice for coal supply conduit
US8122911B2 · kind B2 · utility
Inventor
Key dates
| Filing date | May 5, 2010 |
| Grant date | Feb 28, 2012 |
| Priority date | — |
| Expiry date | Jul 14, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7898
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A variable orifice for use in connection with a conduit designed to convey particulate material comprising a set of semi-circular plates mounted on respective concentric shafts so that they may be rotated in opposite directions between a first position in which they extend across the interior of the conduit for maximum flow resistance to a second folded condition where they are adjacent and parallel to one another to present minimum flow resistance. An actuator is connected through the concentric shafts to the plates and mounts on the outside of the conduit surface. The unit is operated by hand crank and has a position indicator. The size of the valve plates is such that, even when fully extended relative to one another and lying across the cross-section of the conduit, only about a 30% restriction is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.