Abstract: Mechanical foam fire fighting equipment and method wherein an inert gas is delivered to a foaming chamber of a mechanical foam making assembly, the foaming chamber also receiving a liquid and foam concentrate, the inert gas in some embodiments being supplied by the exhaust of an engine.

Abstract: Nozzle, apparatus and method for extinguishing fires that includes applying to a fire simultaneously a first fluid surrounded by a second fluid and that includes a nozzle for discharging a first fluid in a path surrounded by a second fluid.

Abstract: A method and apparatus for extinguishing fires by simultaneously applying a spray of dry powder and liquid/liquid-foam, including a nozzle for the simultaneous spray of powder and liquid/liquid-foam, wherein the velocity of the powder stream can be adjusted.

Abstract: A method and apparatus for extinguishing fires by simultaneously applying a spray of dry powder and liquid/liquid-foam, including a nozzle for the simultaneous spray of powder and liquid.

Abstract: A quickly adjustable foaming chamber stem for a foam-applying fire-fighting nozzle wherein the fire-fighter can quickly switch from applying on optimum foam to a stream with an optimum throw. The stem is comprised of a deflector plate and a mixing plate that define a foaming chamber there between, the deflector plate having ducts that, when open, communicate a portion of the liquid and foam-stabilizing concentrate into the chamber to form a foam. The foaming chamber, maintained at approximately atmospheric pressure, forms a small homogeneously bubbled maximum foam through liquid from the ducts striking and reflecting from the mixing plate, causing thereby turbulence and agitation. Surface portions of the mixing plate are inclined to maximize agitation.

Abstract: An apparatus for making foam using a foam concentrate, a liquid and a vapor comprises a primary cylinder defining a mixing chamber therein. An eductor is disposed substantially within the mixing chamber for drawing in foam concentrate while mixing the foam concentrate with a portion of the liquid entering the apparatus. A secondary cylinder defining a foam chamber therein is in flow communication with the primary cylinder at one end via a flow passage therebetween. The eductor extends through the flow passage and into the secondary cylinder thereby defining an annulus in the flow passage to allow a portion of the liquid in the primary cylinder to by-pass the eductor and enter the secondary cylinder. Vapor is drawn into the secondary cylinder to mix with the combined liquid stream from the annulus and the stream from the eductor to create foam in the secondary cylinder. The foam may be directed to a storage tank for fire-fighting.

Abstract: The invention involves a mixing apparatus capable of mixing two or more chemicals using a motive liquid. An ejector draws in a first chemical which is directed to the input of an eductor. A second chemical is connected directly to the eductor. The motive liquid provides the motive force for both the ejector and the eductor. By reason of the feeding of the first chemical to the eductor from the separate ejector rather than directly into the eductor, the ratio of the first chemical to the second chemical fed into the eductor is more accurately controlled than if both chemicals were directly fed to the eductor. The chemicals are mixed in the eductor and are discharged as a foam preferably through a foam nozzle.

Abstract: An apparatus for mixing chemicals comprises a motive fluid inlet, a first and second chemical inlet and a chemical outlet. An eductor draws chemicals through the first and second inlets and mixes them with a motive fluid. Restriction devices are provided in each chemical inlet to regulate the ratio of chemicals mixed by the apparatus. The mixture of chemical and motive fluid creates a stabilized foam water solution which is mechanically adjusted by a nozzle producing stabilized foam.