System for introduction of concentrated liquid chemical foamant into a water stream for fighting fires

摘要: A fire fighting system introduces a liquid chemical foam concentrate into water stream. The may incorporate either or both of hydraulic motor driven pump under control microprocessor-based valve driver and an electric DC drive circuit. circuit is adapted to be connected in electrical communication with the display/controller also incorporating microprocessor. When operating dual mode, when quantity foamant that must added stream maintain desired percentage mixture exceeds capacity pump, transferred, via driver, allow separate pump. In this fashion, can cover first range flow rates from very low rate intermediate then taking over extend relatively high rate.