Foam additive supply system for rescue and fire fighting vehicles
US6725940B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2000 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | May 10, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62C31/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A system for supplying a pre-determined ratio of liquid foam concentrate and water to a mixing device immediately upstream from a fire fighting nozzle. The system is electronically balanced by measuring pressure from a plurality of pressure signal sensors and transmitting said pressure signals to a controller unit. A foam additive pump is powered by a fixed displacement piston motor which in turn is electronically modulated independently of the level of operation of the water pump by a control system that is responsive both to the water pressure developed by the water pump and to the foam liquid concentrate pressure developed by the additive pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.