The PHYM series foam proportioning mixer is a crucial piece of equipment for fixed low-expansion foam fire protection systems in oil fields, refineries, petrochemical plants, garages, hangars, oil tanker transport ships, and docks. When paired with foam generators, foam nozzles, foam guns, foam cannons, or other spraying equipment, it can produce low-expansion air foam to extinguish Class A or water-soluble and non-water-soluble Class B fires. The foam liquid used in this unit is a low-expansion foam liquid, and water-forming foam liquids are recommended.

This unit is primarily composed of a foam liquid storage tank with capsules, foam ratio mixer, inlet and outlet pipelines, exhaust pipeline, position markers, and drain pipelines. Each pipeline is equipped with a valve; the ratio mixer is installed on the side of the tank; the inlet and outlet pipelines connect the tank to the mixer. Safety valves and pressure gauges are also installed on the inlet and exhaust pipelines. The drain, inlet, outlet, and exhaust pipelines can form a complete cleaning loop, allowing for a thorough wash of the tank, outlet pipelines, and ratio mixer with clean water, removing any dirt and impurities within the foam liquid storage tank and pipelines. The safety valve on this unit ensures that it opens to release pressure when the tank's pressure exceeds 1.05 to 1.1 times the maximum working pressure. Once the tank's pressure drops back to the working pressure, the safety valve closes, providing protection for the foam storage tank.

This product is a capsule-type foam device, featuring high-strength rubber capsules inside the tank, which completely separate foam liquid and water. It operates by equal substitution of water for foam liquid. Each use provides an accurately proportioned (3% or 6%) mixture, and any remaining foam liquid can be reused, thus maximizing foam liquid savings and reducing fire protection costs. When the system is active, a pressure water source is fed through the inlet pipe by the inlet valve to fill the tank and compress the capsules, displacing the foam liquid. This displaced foam liquid is then proportionally mixed with water in a proportioning mixer to form a low expansion foam mixture, which is transported out through the outlet.