A system for fighting fires from a helicopter. The system has a wetting agent tank to hold a wetting agent, a suppressant mix tank to hold a fire suppressant mix including water and the wetting agent, and pumps. The system has a fire hose containment system including a retractable hose to deliver the fire suppressant mix from the suppressant mix tank through a suppressant mix hose to the hose containment system and out through the retractable hose. The hose containment system has a hose drum around which the retractable hose is stored, and a motor to extend and retract the retractable hose. Coupled to the distal end of the retractable hose is a nozzle array unit configured to direct the fire suppressant mix to a fire through nozzles included in a nozzle array housing of the nozzle array unit.

An ice slurry firefighting system includes a water tank for receiving and storing water from a water source. A water pump is connected to the tank and pumps water to a valve. The valve selectively directs the pumped water to one or both of a slurry generation unit and a pump panel. The slurry generation unit includes a condenser, an evaporator, and a compressor that remove heat from water supplied by the tank passing over evaporator coils to produce an ice slurry mixture. The pump panel houses a system controller and a valve tap for engaging a fire hose and nozzle. The system controller operates the pump, the valve, the slurry generation unit, and a ratio control valve to dispense any ratio of water and ice slurry through the hose and nozzle. A generator provides power to the system components.

A ratio controller includes a housing defining a mixing chamber. The housing has a water inlet configured to receive water from a water supply, an agent inlet configured to receive agent from an agent supply, an outlet configured to output an agent-water solution, a first pressure port extending through a sidewall of the housing at a first position proximate the water inlet, and a second pressure port extending through the sidewall of the housing at a second position proximate the mixing chamber.

A method as well as a liquid mixing system provide a liquid-foam mixture by mixing water with at least one additive. The liquid mixing system includes a water pressure source, an additive reservoir unit, an air compressor unit with a compressor and a drive device, a first and second mixing device, a discharging unit, and multiple different line networks for the respective media. The drive device is formed by a water engine or a water turbine, the water inlet of which is line-connected to the water pressure source.

A method for producing a firefighting medium from water (W) and a liquefied gas, such as liquid nitrogen (LN) or liquid carbon dioxide, a fire extinguisher (200) for extinguishing a fire with the produced firefighting medium, and a method for extinguishing a fire with the produced firefighting medium, wherein the firefighting medium (FFM) is produced by spraying a pressurized jet of water (WJ) out of a nozzle (201) at a pressure of, for instance, at least 50 bar and mixing a proportion of liquid nitrogen (LN) into the jet of water (WJ).

A fluid system of a fire apparatus includes a water circuit, an agent circuit, and a ratio controller. The agent circuit includes an agent metering valve. The agent metering valve includes a flow restrictor having a non-uniform profile. The ratio controller is configured to (a) receive water from the water circuit and agent from the agent circuit and (b) provide an agent-water solution.

A admixing system for fire extinguishing systems for producing an extinguishing agent-extinguishing agent additive mixture (premix) by mixing an extinguishing agent additive with an extinguishing agent. The admixing system has a motor that can be driven by a flow of extinguishing agent, an admixing pump connected to the motor for pumping the extinguishing agent additive, an admixing line, and an extinguishing agent additive line, from which the extinguishing agent additive is mixed with the extinguishing agent in the admixing line. The admixing system has a branching line, from which a part of the flow of extinguishing agent can be branched off if the load in the fire extinguishing system only requires a small flow of extinguishing agent. In this manner, the flow of extinguishing agent flowing through the motor is artificially increased so that the motor runs in a higher rotational speed range in which a reliable operation of the motor is ensured (a so-called start-up flow reduction). The admixing system has a motor rotational speed measuring device and a controller, said controller being designed to completely or partly open and/or close the branching valve on the basis of the motor rotational speed measured by the motor rotational speed measuring device.

A chemical injection system. The chemical injection system includes at least two Venturi injectors in parallel. Each of the Venturi injectors having an injector housing with a longitudinal cavity having the shape of hourglass. One end of the longitudinal cavity forms an injector inlet, and the other end forms an injector outlet. Each of the injector housings also has a first vertical cavity forming an injector port located at the hourglass constriction. The injector inlets are fluidly coupled together to form a shared injector input and each of the injector ports is fluidly coupled to an individual valve. Each of the injector outlets is fluidly coupled to the input a separate T-filter and the outputs of the T-filters are fluidly coupled together to form shared T-filter output.

An ice slurry firefighting system includes a water tank for receiving and storing water from a water source. A water pump is connected to the tank and pumps water to a valve. The valve selectively directs the pumped water to one or both of a slurry generation unit and a pump panel. The slurry generation unit includes a condenser, an evaporator, and a compressor that remove heat from water supplied by the tank passing over evaporator coils to produce an ice slurry mixture. The pump panel houses a system controller and a valve tap for engaging a fire hose and nozzle. The system controller operates the pump, the valve, the slurry generation unit, and a ratio control valve to dispense any ratio of water and ice slurry through the hose and nozzle. A generator provides power to the system components.