Bulk cement metering device
US5174320A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 1992 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Jan 3, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8275
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An improved bulk cement metering apparatus includes a valve housing having a cylindrical inner housing bore. The housing has an inlet opening through a side wall thereof. A housing outlet is defined at an open lower end of the cylindrical valve housing. A cylindrical valve element is concentrically and rotatably received within the housing bore. The valve element is rotatable relative to the valve housing between a first fully closed position and a second fully open position. In the closed position the valve element completely blocks the inlet opening. In the open position the inlet opening is completely open. As the valve element rotates from its closed position to its open position a circumferentially extending cutout means thereof progressively uncovers an increasing upper portion of the inlet opening. This design results in decreased plugging of the metering device at low flow rates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.