First, the product description ????? PFG4 expansion foam fire extinguishing system is one of the main equipment of high-expansion foam fire extinguishing system. It features easy to use and flexible, foaming capacity, suitable for extinguishing flammable liquids, gases, fire, fixed storage, a variety of large, medium-sized ship's cabin, pump room, expensive equipment, underground engineering and other places. ? Second, the principle ??? supply equipment to provide 0.3-1.0 Mpa pressure water directly into the part of the main channel through turbines, water wheels rotate the drive and turn the drive wheel through the wind turbine shaft. Another part of the water flowing through the proportioner, a sharp increase in the flow rate of the nozzle, the vacuum chamber to form a vacuum, high-expansion foam liquid in the tank by suction pipette proportioner vacuum chamber, mixing with the water coming from the nozzle exit together into the pipe, and then with the outflow from the turbine second mixed water, administered Netcom had four heads of the foam mixture to form a mist sprayed into the foaming, the inner surface of the network form a thin film, the wind wheel Online wind blowing, blow bubbles into a large, high-expansion foam is configured, flooded or covered with burning surface. Interdiction use foam, cooling and suffocation achieve the purpose of extinguishing