The PC series low expansion foam generator is the main component of the low expansion foam extinguishing system that sprays foam on the liquid surface. The low expansion foam generator mixes the liquid produced by the proportioning mixing device with inhaled air to create air foam, which is then sprayed onto the burning surface through a deflector or foam nozzle to form a foam layer. This layer utilizes the foam's blocking, cooling, and asphyxiating effects to achieve extinguishing. Structurally, they can be divided into horizontal (PC type) and vertical (PCL type) models.