Abstract: System for distributing secondary fluid into a primary fluid, as in a fire-fighting system, including a proportioner having plurality of passages, each of which is sized for the amount of secondary fluid necessary for a particular one of a plurality of fire-fighting elements.

Abstract: A foam generating apparatus includes a manifold defined by a rectangular metal block, into which a liquid and surfactant is introduced under very high pressure via a first longitudinally extending passage, and air is introduced via a second longitudinally extending passage parallel to the first passage. The liquid passes through restricted orifices into the narrow ends of a plurality of venturi outlet passages, which are perpendicular to the liquid inlet passage. The velocity of the liquid/surfactant mixture exiting the restricted orifices is maintained sufficiently high to cause flashing to take place to initiate foam generation. Air is injected into the venturi through small diameter ports extending from the second inlet passage to the venturi. The foam and liquid/gas mixture is discharged from the venturis through fittings which may contain vaned inserts for promoting turbulence and thus foaming. Foam production continues in the foam carrying lines downstream of the discharge bushings.

Abstract: A foam liquid proportioner including a positive displacement water motor coupled to a positive displacement foam liquid pump is provided with a gear drive mechanism which steps up the RPM of the foam liquid pump to be much higher than the RPM of the water motor to a speed so as to reduce the ratio of the slippage of foam liquid to the total flow of the foam liquid through the foam liquid pump.

Abstract: A system for supplying foam liquid concentrate via a concentrate pump to one or more water pump discharge outlets. The concentrate pump is powered by a variable output hydraulic drive which in turn is automatically modulated independently of the level of operation of the water pump by a control system which is responsive both to the water pressure developed by the water pump and to the foam liquid concentrate pressure developed by the concentrate pump.

Abstract: An apparatus for use in foam-type fire-fighting equipment in which a halogenated hydrocarbon (halogen), preferably trifluorobromomethane, CF.sub.3 Br, is injected into the fire extinguishing agent to improve the efficiency thereof. In several embodiments in which a foam nozzle or a foam generator is employed, the halogen is metered at a prescribed rate into the foam or foam liquid to entrain halogen into the bubbles of the foam such that the bursting of the bubbles due to the effects of the fire release the halogen to act on the fire. In further embodiments, a foam for fighting fires is produced with a plain hose nozzle by injecting the halogen into the fire extinguishing agent, the bubbles of the foam having halogen entrained therein that is released when the foam is used to blanket a fire.

Abstract: An apparatus (10) for generating and discharging foam is provided. Apparatus (10) includes a container (12) for receiving and storing a foam generating solution (24). A discharge tube (66) is connected to container (12). An ejector tube (32) is disposed within container (12) for discharging the foam generating solution (24) to the discharge tube (66). Foam generating structure (34) is disposed between the ejector tube (32) and the discharge tube (66) exterior of the container (12) and includes a chamber (74) communicating with ejector tube (32) for permitting the passage of the foam generating solution (24) therethrough to the discharge tube (66). A pressure source (52) communicates with the container (12) for forcing the foam generating solution (24) through the ejector tube (32) and the foam generating structure (34). The pressure source (52) further communicates with the chamber (74) for aerating the foam generating solution (24) prior to flowing through the discharge tube (66).

Abstract: Apparatus for introducing a widely variable predetermined quantity of liquid from a non-pressurized source into a flowing stream of a pressurized fluid. The unitary apparatus is readily detachably assembled to bulk shipping containers of different sizes and its pneumatically powered proportioning mechanism is quickly adjustable at will to pressurize and dispense a liquid at a selected one of many different precise rates into a pressurized fluid stream. The apparatus is readily and quickly adjusted to operate at a wide range of pressures and at many hundreds of pounds per square inch and to vary the ratios of the two fluids between one part in 1,000 and one part in 40,000. The proportioner has many applications including dispensing a fire fighting agent into a pressurized water line supplying fire hoses.

Abstract: A system for injecting chemicals into a fire fighting system of the type using a plurality of water hoses and having a source of water and a source of chemicals. A servo motor system is connected to automatically meter a certain ratio of chemicals into the water supply. The servo motor system is responsive to the total flow to control the chemical pump to pump a certain ratio of chemicals into the water supply even if the total flow varies.

Abstract: Nozzle having a housing with a cylindrical inner surface and with a fixed wall extending at a right angle to its axis. A movable wall is mounted in the housing adjacent the fixed wall and is rotatable about the axis, so that a pattern of apertures in the movable wall match similar apertures in the fixed wall to control flow of fluid therethrough.

Abstract: A process for the simultaneous utilization of low expanded foam and medium expanded foam produced by respective generators thereof, for the extinction of fires, from liquefied gas comprising transporting the medium expanded foam by the faster traveling low expanded foam in order to provide a high velocity of flow of the medium expanded foam. The low expanded foam is produced by a plurality of generators disposed beneath a single generator of medium expanded foam and inclined with respect thereto to direct the jets of low expanded foam into the lower part of the jet of medium expanded foam.

Abstract: A fire curtain constituted by two nets of nonflammable material is stored in a container on the ceiling and hangs therefrom as soon as a fire starts. Simultaneously, a mixture of water and a bubbling agent in the form of fine bubbles is flown down the curtain to check the spread of flame and smoke. Any section where a fire starts can be isolated from neighboring sections by means of a plurality of such fire curtains. Made of soft, flexible material, the curtain used neither injures a person upon closure nor prevents him from escaping to safer places.

Abstract: Foam producing equipment in which a container interior is sub-divided by a concentric array of cylindrical shells into radially spaced concentric chambers. A relatively small amount of a foamable liquid solution is held in the lower part of the container, and, above the liquid level, the shells are selectively perforated. A compressed gas is admitted to an outermost concentric chamber and agitates the liquid solution therein to form a foam which rises and then in a generally radial motion moves progressively through the perforate wall portions of the concentric shells to a foam outlet associated with a central, innermost concentric chamber. A staged extraction of liquid, with foam compaction, occurs as the foam is forced through successive perforate shell portions, with separated liquid utilizing imperforate wall portions of the shells to drain back into the supply of the liquid solution.

Abstract: An automatic fire extinguishing system acting through aerated foam filling of the room on fire. The automatic fire extinguishing system includes an air conditioning system comprising a central blower with air feeding ducts having an air inlet in each room, an air outlet in each room communicating with an exhaust duct, a screen occupying the section of each of the air inlets, a foaming mixture generator for spraying the screen with foaming mixture arranged near the air inlet and at least a fire detector in each room, the fire detector controls the foaming mixture generator of the room.

Abstract: A modular fire-fighting unit can be used on the ground as an individual fire piece connected to a water source such as a hydrant, for producing foam or as a nurse unit to other fire apparatus, or it can be quickly mounted on, or demounted from, a portable source of water such as a 5,000 gallon tank truck, for producing foam to extinguish runway fires. The module includes a protein tank, an AFFF tank, an inflexible connection to a source of water, mixing valves and a motor driven pump so that foam may be dispersed from either a turret gun or an airport spreader bar.