PF(PFS) high expansion foam generator is one of the main equipment of high expansion foam fire extinguishing system and can be used on fixed fire extinguishing devices. It can also be used on mobile fire extinguishing equipment, characterized by high foaming capacity and suitable for extinguishing various types of fires. PF(PFS) series high expansion foam generator is a water pump that provides the pressure mixed solution to deliver to the generator. When the mixed solution passes through the water spray wheel, the rotating jacket drives the fan blade to rotate, thus forming a secondary afterburner rotation, so that the fan can generate strong airflow, blow up the mixed solution to produce a large amount of high expansion foam to cover the fire point, which has the functions of cooling, oxygen isolation and fire extinguishing, and protecting personnel safety. The high expansion foam generator is applicable to warehouses, garages, tunnels, libraries, liquefied gas stations, archives, chemical workshops, passenger and cargo ships, shopping malls, hotels, machine rooms, coal yards, garbage stations, etc.