Eductor apparatus
US7367361B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 2005 |
| Grant date | May 6, 2008 |
| Priority date | — |
| Expiry date | Nov 22, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87643
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An eductor assembly includes an inlet connectable to a high pressure water source useful in firefighting, an outlet connectable to a fire hose and/or nozzle, and a venturi therebetween. An additive inlet communicates with the venturi so that a chemical additive, such as a foam concentrate, is educed into the output stream. A check valve is positioned at the additive inlet to open under venturi flow conditions and remain closed otherwise. An actuator is provided that holds the check valve in its open position while water flows through the eductor assembly under non-venturi conditions to produce a back flow through the additive inlet and ultimately through the additive fluid circuit, including the additive metering valve components. A return element may be disposed within the eductor body to return the check valve to its closed position when the back flow ceases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.