Abstract:
Fire hydrants which feature additional structure for reducing the potential that those with ill intent can foul municipal water supplies by introducing toxins or other materials into fire hydrants. Various embodiments include valves which close off portions of the hydrant otherwise available for receipt of toxic or other materials when the fire hydrant nozzle cap is unscrewed and open. Such valves preferably open, manually or automatically, when water is flowing from the water supply through the nozzle, a condition which renders it difficult at best to introduce toxins through the hydrant into a water supply, but close off portions of the barrel when the nozzle is open and water is not flowing through the nozzle.
Abstract:
L'invention concerne une borne d'incendie (10' ) comprenant un corps creux (12'), un obturateur principal (28) et un dispositif de manoeuvre (24, 26) permettant l'ouverture ou Ia fermeture de l'obturateur principal (28) depuis l'extérieur. La borne d'incendie (10') comprend en outre un obturateur libre (40) placé dans Ie corps creux (12') et étant apte à passer automatiquement d'une part dans une position d'ouverture lorsque Ia pression de l'eau dans Ie corps creux (12') est plus importante en amont qu'en aval de l'obturateur libre (40) et d'autre part dans une position de fermeture lorsque la pression de l'eau dans le corps creux (12' ) est plus importante en aval qu'en amont de l'obturateur libre (40) ou lorsque l'écoulement de l'eau cesse. De façon caractéristique, des moyens d'ouverture d'urgence (60) permettent, par une activation extérieure, de forcer le passage de l'obturateur libre dans sa position d'ouverture.
Abstract:
Wet barrel fire hydrants (10) which feature additional structure for reducing the potential that those with ill intent can foul municipal water supplies by- introducing toxins or other materials into fire hydrants. Various embodiments include valves which close off portions of the hydrant or water conduit otherwise available for receipt of toxic or other materials when the fire hydrant nozzle cap is unscrewed and open and/or a pump is connected to the nozzle (14). Such valves preferably open automatically when water is flowing from the water supply through the nozzle (14), but close off portions of the barrel when the nozzle (14) is open and water is not flowing through the nozzle (14).
Abstract:
The present invention relates to methods and devices for retrofitting fire hydrants with additional structure for reducing the potential that those with ill intent can foul municipal water supplies by introducing toxins or other materials into fire hydrants. Various embodiments include a replacement hydrant body having an enlarged diameter portion that can be installed to replace an existing hydrant body. The replacement hydrant body can include a secondary valve comprising a seat, biasing structure, and a restriction member to close off portions of the hydrant otherwise available for receipt of toxic or other materials when the fire hydrant nozzle cap is unscrewed and open.
Abstract:
The present invention relates to methods and devices for retrofitting fire hydrants with additional structure for reducing the potential that those with ill intent can foul municipal water supplies by introducing toxins or other materials into fire hydrants. Various embodiments include a seat and elongated member for efficient and cost effective installation and cooperation with valves, which close off portions of the hydrant otherwise available for receipt of toxic or other materials when the fire hydrant nozzle cap is unscrewed and open.
Abstract:
A device for flushing a hydrant includes a stem connected to a valve of the hydrant; and an actuation system including a biased translational system coupled to the stem. An actuation system for flushing a hydrant includes a fluid; a piston assembly movable by the fluid; and a biasing element at least indirectly biasing the piston assembly towards a stop position. A method of flushing a hydrant includes operating an actuation system coupled to the hydrant, the actuation system including a stored energy device, a piston assembly coupled to a stem of the hydrant; and a biasing element coupled to the stem, the stem connected to a valve of the hydrant; and opening the valve of the hydrant by releasing energy from the stored energy device against a piston plate of the piston assembly.
Abstract:
An insertable backflow preventer is presented. The backflow preventer is provided with a cylindrical housing. The housing has a flow transition zone, a proximal orifice/ball seat, a ball with a specific weight that equals or is close to the specific weight of the surrounding fluid, and a distal retaining screen. The housing can have a flange provided on the outside of the housing at one end to facilitate securing the valve in a pipe. The valve is self-cleaning, can be placed in any orientation in a pipe and has low hydraulic head-loss. The valve's unique cost- effective design provides for easy and relative quick installation, eliminates the need to reconfigure existing plumbing, and can be performance tested remotely. Properly installed, it can dramatically improve the security of, for example, potable water sources in a building or other context, and inasmuch as when installed it is not visible, it is tamper proof. The valve can be scaled to any size pipe or tube, and due to its internal flow dynamics is self cleaning. Multiple valves can be installed in series, and balls of varying specific weight can be used in each valve in such a series to allow for contexts where a range of fluids are sent through the same line, or to provide fail-safe operation in the event that contaminants change the specific gravity of the fluid.
Abstract:
A backflow prevention system that helps prevent contamination of potable water distribution systems from backflow at fire hydrant connections.
Abstract:
Unterflurhzdrant (1) mit einem Mantelrohr (2), mit einem sich daran nach unten anschliessenden Ventilgehäuse (3), das mit einer Anschlussöffnung (5) über einen unteren Anschlussflansch (4) unter Zwischenschaltung einer Ringdichtung (25) an eine Wasserleitung anschliessbar ist, mit einem im Ventilgehäuse (3) gelagerten Hauptventil (7, 10, 11), dessen Ventilkörper (7) mittels einer im Mantelrohr (2) geführten Spindel (6) betätigbar ist, und mit einem unterhalb des Hauptventils (7, 10, 11) angeordneten Rückschlagventil (8, 12), dessen Ventilkörper (8) im Ventilgehäuse (3) geführt und mittels einer in die Anschlussöffnung (5) eingesetzten, an ihrer Wand (17) befestigten und ihren freien Durchmesser (D5) verringernden ringförmigen, aus einer Buchse (16) und einem Bund (18) gebildeten Halteeinrichtung (15) am Herausfallen gehindert ist. Um die Halteeinrichtung einfach und billig und so herzustellen, dass sie mit einer standardisierten Ringdichtung zusammen wirken kann, ist sie so ausgebildet, dass der Bund (18) eine separate Ringdichtung (25) am Anschlussflansch (4) festhält.
Abstract:
A check valve for a fire hydrant system is configured to allow fluid to flow in a direction from a pressurized water supply to a fire hydrant and to restrict fluid from flowing from the fire hydrant to the pressurized water supply. The check valve includes an internal cavity and a flapper capable of moving between an open position wherein the flapper is positioned against a side of the internal cavity so as to substantially not impede flow of fluid therethrough and a closed position wherein the flapper creates a seal to restrict flow of fluid therethrough.