A proportioner having a body portion that defines a fluid passage for transporting a fire protection fluid, and a foam passage for transporting a foam concentrate. The proportioner also includes a restrictor assembly having a restrictor disk and an orifice plate. The proportioner further includes a clapper assembly configured to control a flow of the foam concentrate through the foam passage by varying a distance between the restrictor disk and the orifice plate. The clapper assembly is configured to move the restrictor disk so as to maintain a foam concentrate percentage in the fire protection solution within a target concentration that provides effective fire protection for flows of the fire protection solution within a target flow ratio in a range of 10 to 70, for a foam concentrate viscosity that is greater than 1300 mPas.

The present invention relates to a method for producing compressed-air foam and to a corresponding device. The method comprises providing fire-fighting water admixed with foaming agent, and foaming the fire-fighting water admixed with foaming agent, with addition of compressed gas, wherein the compressed gas comprises a chemical extinguishing agent. The method according to the invention and the device according to the invention allow the production of an effective extinguishing foam due to the inhibitory effect of the chemical extinguishing agent.

The invention relates to fire-fighting ground vehicles. A mobile fire extinguishing apparatus with pressurized foam generation comprises: a mixing chamber for supplying foam to a fire; and, a water supply system comprising a water supply pump with a drive, a foam-forming concentrate supply system comprising a foam pump with a drive, and also an air supply system comprising an air compressor with a drive. The drives of the compressor and of the foam pump are in the form of an adjustable hydraulic transmission of the air compressor drive and an adjustable hydraulic transmission of the foam pump drive, which are connected to a driving motor. The apparatus comprises a water meter, a gate valve having an electric drive, and a non-return valve, which are mounted on a water supply pipe between the water supply pump and the mixing chamber, and an electronic control unit for the gate valve.

The present invention relates to the technical field of mine fire prevention and extinguishing, in particular to a liquid nitrogen direct injection and low-temperature foaming intelligent filling system based on mine fire area characteristics and an application method, comprising a liquid nitrogen storage tank, a liquid nitrogen direct injection system and a low-temperature foaming system, wherein the liquid nitrogen storage tank communicates with a liquid nitrogen pressurizing device through a main pipeline; a temperature control unit is arranged on the main pipeline; and the liquid nitrogen pressurizing device is connected with the liquid nitrogen direct injection system and the low-temperature foaming system, respectively, liquid nitrogen is directly injected into a foam liquid, to prepare a low-temperature foam type fire preventing and extinguishing material by means of forced convection, membrane boiling, explosion boiling and nucleate boiling between the liquid nitrogen and water.

A proportioner having a body portion that defines a foam passage and a fluid passage. The proportioner also includes a restrictor assembly having a restrictor disk and an orifice plate having an opening for receiving the restrictor disk. The proportioner can further include a rod member connected to the restrictor disk and a clapper assembly connected to the rod member via a sliding interface. The clapper assembly can be configured to control a flow of the foam concentrate through the foam passage in proportion to a flow of the fire protection fluid through the fluid passage by moving the rod member to vary the distance between the restrictor disk and the orifice plate. The sliding interface can be disposed between a first guide and a second guide, and at least a portion of the restrictor disk is disposed in the opening.

An integrated operator interface for a fire suppression system is provided. The fire suppression system includes an engine, a water source, a water pump, a foam system and a compressed air system. The integrated operator interface includes a control panel including a plurality of one-touch activation controls. Each one-touch activation control is configured to cause the output of a predetermined fire suppression fluid from the fire suppression system and cause a predetermined increase in engine speed resulting in an associated increase in water pump pressure. The predetermined fire suppression fluid comprising a predetermined flow of water, a predetermined type of foamant, a predetermined concentration of the predetermined type of foamant, and a predetermined flow of compressed air.

An integrated operator interface for a fire suppression system is provided. The fire suppression system includes an engine, a water source, a water pump, a foam system and a compressed air system. The integrated operator interface includes a control panel including a plurality of one-touch activation controls. Each one-touch activation control is configured to cause the output of a predetermined fire suppression fluid from the fire suppression system and cause a predetermined increase in engine speed resulting in an associated increase in water pump pressure. The predetermined fire suppression fluid comprising a predetermined flow of water, a predetermined type of foamant, a predetermined concentration of the predetermined type of foamant, and a predetermined flow of compressed air.

This application with regard to an apparatus of mixing a compressed air foam is disclosed. The disclosed application includes a first mixing unit that receives fire water and an undiluted foam solution, and adjusts an inflow of the undiluted foam solution so that a supply amount of the undiluted foam solution is adjusted in proportion to a supply amount of the fire water, and mixes the received fire water and undiluted foam solution to produce a foam aqueous solution; and a second mixing unit that mixes a compressed gas with a foam aqueous solution produced in the first mixing unit to produce a compressed air foam.

The present disclosure provides an air mixer for a compressed air foam (CAF) fire-extinguishing system. A foam concentrate and compressed air are respectively transported by a liquid inlet pipe and an air inlet pipe. When the compressed air and the foam concentrate enter a straight pipe through a first tapered pipe, they reach an outlet end of the first tapered pipe through a path narrowing due to different cross-section diameters at two ends of the first tapered pipe, and there is a compression process. Under an action of a high-pressure airflow, the foam concentrate is fully mixed. The mixed foam concentrate reaches a porous plate of the straight pipe and can be mixed secondarily. When the foam concentrate is discharged by a second tapered pipe, a flow path widens and there is a release process.

The present invention relates to the technical field of mine fire prevention and extinguishing, in particular to a liquid nitrogen direct injection and low-temperature foaming intelligent filling system based on mine fire area characteristics and an application method, comprising a liquid nitrogen storage tank, a liquid nitrogen direct injection system and a low-temperature foaming system, wherein the liquid nitrogen storage tank communicates with a liquid nitrogen pressurizing device through a main pipeline; a temperature control unit is arranged on the main pipeline; and the liquid nitrogen pressurizing device is connected with the liquid nitrogen direct injection system and the low-temperature foaming system, respectively, liquid nitrogen is directly injected into a foam liquid, to prepare a low-temperature foam type fire preventing and extinguishing material by means of forced convection, membrane boiling, explosion boiling and nucleate boiling between the liquid nitrogen and water.