The device consists of foam tanks, pressure ratio mixers, diaphragms, inlet pipes, outlet pipes, and control valves, etc. As the pressure water flows through the ratio mixer of the device, it automatically mixes water with foam liquid in a certain proportion, outputting a foam mixture for use in foam generation and jet equipment to produce air foam for fire extinguishing.

This device can be integrated with fire pumps (or fire trucks), foam generators, and foam喷射 equipment to form fixed or semi-fixed foam fire extinguishing systems. It is widely used for extinguishing Class A (excluding liquefied gas), B, and C fires, boasting advantages such as safety, reliability, and high fire extinguishing efficiency. It is a commonly used fire protection equipment in oil depots, refineries, chemical factories, oil fields, docks, oil tankers, aircraft hangars, airports, and fuel boiler rooms.