Abstract:
A sprinkler head for fixed fire extinguishing systems of the type in which a fluid extinguishant is supplied under line pressure to a plurality of such heads, in which the actuation of the head in response to fire is inhibited when line pressure drops below a predetermined magnitude, thereby to preserve the ability of already actuated heads in the system to disperse extinguishant on a fire. In one embodiment, a movable heat shield is employed together with line pressure responsive means for controlling the position of the heat shield with respect to the sprinkler head fuse. In another embodiment, a pressure responsive valve is employed to permit passage of extinguishant through a bleed conduit directly to the fuse thereby to effect cooling thereof.
Abstract:
A device for controlling the flow of fluid, wherein a fluid distributing member is connected to a source of fluid in response to a predetermined temperature condition to establish a fluid flow path in the fluid distributing member. An additional fluid flow path is established in the fluid distributing member in response to a predetermined fluid pressure occurring therein. A fixed fire extinguishing system incorporating the above fluid flow control device.
Abstract:
A shutoff valve for main supply conduits in fluid-handling systems, such as fixed fire protection systems, where it is imperative that the supply conduit remain open at all times except when repairs and other maintenance operations require the system to be shut off. The valve is biased open and includes an actuator which moves the valve to and maintains it in a closed position in response to an energy input, the cessation of which effects return movement of the valve to its normal open position.
Abstract:
An injection apparatus for introducing a slurry of water swellable gelling agent into a water line feeding a fixed fire extinguishing system to form an ablative extinguishant therein. The apparatus includes a peristaltic pump driven by a hydraulic motor using water at line pressure for motive fluid and controlled by a servomechanism driven in part by a flow sensor to ensure injection rates corresponding to flow rates of water in the line. The injection apparatus is operated in a no-injection failure mode to avoid interference with normal flow of plain water to the fire extinguishing system.
Abstract:
A shelf stable slurry for injection into ablative water fire extinguishing systems comprises a uniform suspension of polyacrylamide polymer gelling agent in a polyoxyalkylene vehicle containing a stabilizing amount of silica suspending agent.
Abstract:
An injection apparatus for introducing a slurry of waterswellable gelling agent into a water line feeding a fixed fireextinguishing system to form an ablative extinguishant therein. The apparatus includes a peristaltic pump driven by a hydraulic motor using water at line pressure for motive fluid and controlled by a servomechanism driven in part by a flow sensor to ensure injection rates corresponding to flow rates of water in the line. The injection apparatus is operated in a no-injection failure mode to avoid interference with normal flow of plain water to the fire-extinguishing system.
Abstract:
Method of arresting the flow of liquid in a pipeline so that the pipeline can be repaired or altered comprising transforming the flowing liquid into a gel which resists push.
Abstract:
A double-rate flow controller including a means for permitting fluid flow at a first high-flow rate, a means for reducing the first flow rate to a second lower flow rate and a means for regulating the volume of water passing through the flow controller during the high-flow condition before the high-flow rate is terminated and the low-flow rate begins.
Abstract:
A flow sensing and control arrangement by which a jet of line fluid is continuously directed across a flow line against a biased pressure responsive device which moves to initiate a control function upon diffusion of the jet when line flow occurs. In a preferred embodiment, the pressure-responsive device controls a valve, normally closed by the jet but which opens upon the presence of line flow to introduce an additive to the flow line.
Abstract:
A non-Newtonian scrubbing liquid for use in wet scrubbing pollutants from flue gases. The liquid comprises water, a polymeric additive material, preferably one that will complex when contacted with a bi- or trivalent salt, and lime or limestone. The size and stability of droplets formed in spraying such a liquid may be controlled so that they will penetrate a countercurrent of effluent gases. In so doing, the droplets will entrain particulates, including fly ash or sulfides resulting from the reaction of sulfur dioxide gases in the effluent and the lime or limestone, and form a sludge at the bottom of an apparatus. When contacted with a complexing salt, such as borax, the polymeric material in the sludge forms a fishnet structure which entrains the solids but contracts and releases water therefrom.