(A) structure is dominated by atmospheric foam concentrate tank, balancing valves, pressure relief / pressure valves, safety valves, foam proportioner, foam pumps, control systems, needle gauge, turbine, common base and pipe fittings and the like. (B) the principle of work driven by the pressure of the water when the water wheel rotation, while driving the bubble pump, fluid pressure after the bubble into the balancing valve, balance valve adjustment by injecting proportioner. When the fire mains water pressure and flow changes when there are different conditions, balance can dynamically adjust the amount of fluid injected into the mixer was foam, thus ensuring the device during operation, continue to formulate more precise mixing ratio of foam mixture supply foam fire extinguishing equipment for effective operations. (C) Features ★ dynamically adjusted by balancing valves into the foam proportioner amount of foam, ensure accurate mixing ratio; ★ relief / holding steady pressure relief valve reflux assurance system rated working pressure; ★ apply to any current bubble extinguishing agent; ★ can always add to the tank liquid foam extinguishing process; ★ automatic / manual switch control, easy and reliable