Abstract: The present invention relates to a fluid circulation type heating device which circulates fluid by means of heating and cooling and, more particularly, to a fluid circulation type heating device provided with overpressure protection element which can prevent pressure increase of a circulation path of a fluid. The fluid circulation type heating device according to the present invention for achieving the aforementioned purpose comprises a circulation line, a heat radiation member installed on the circulation line, a boiler which heats and expands a fluid, a storage tank which stores the fluid therein and supplies the same to the boiler, a controller which controls the boiler, and a housing which accommodates the boiler and the controller.

Abstract: The invention includes a method for continually circulating a fluid in a system, in the absence of an external pumping mechanism, by providing a fluid, an active space capable of generating a higher pressure zone and causing a contiguous lower pressure zone, a passive space, and a porous medium disposed between the active space and the passive space, and generating a pressure differential relationship between the active space and the passive space causing the fluid to circulate freely in both directions between the active space and the passive space, across the porous medium, without the aid of an external pumping system, such that the fluid circulation defines a self-acting self-circulating fluid system, and to the system created thereby.

Abstract: The present invention relates to a powerless hot water pumping apparatus which receives cold water through a supply pipe equipped with a backflow prevention check valve, and which generates hot water and powerlessly discharges the hot water through a discharge pipe. The powerless hot water pumping apparatus comprises an electric heater which generates heat when supplied with electric power; an upper cylinder which accommodates the electric heater therein, to the top of which the supply pipe is connected, wherein a steam generating space of a predetermined size is interposed between the inner surface of the upper cylinder and the electric heater; and a lower cylinder which is arranged beneath the upper cylinder, the top of which is in communication with the bottom of the upper cylinder through a connection passage, and to the bottom of the discharge pipe is connected.

Abstract: In a hot water system for providing intermittent hot water, a separate holding vessel is provided and disposed in a hot water line between a hot water source and a plumbing fixture for blending of incoming hot water with residual water in the vessel in order to decrease cold water surges at the plumbing fixture upon repeated use of hot water in the plumbing fixture. A bladder disposed within the separate holding vessel accommodates for thermal expansion of the water.

Abstract: A water heater unit is described for providing convective water flow through a water circulatory system. In one embodiment, the water heater unit has an outer housing, a water tank disposed within the housing, and a first cold water inlet coupled to the tank and connectable to a cold water supply line. A hot water outlet is coupled to the tank and connectable to a hot water supply line. A connection chamber adjacent to the tank has a second cold water inlet connectable to the cold water line, and a chamber outlet connected to the first cold water inlet of the tank. The connection chamber has at least one return inlet connectable to the hot water return line at a position to allow a substantially continuous flow of return hot water driven by convection forces without the benefit of a recirculation pump.

Abstract: The furnace with liquid-cooled grate elements has an inflow and a return to these grate elements, the inflow and the return being connected to a condensation device open to the atmosphere. The inflow has arranged in it a U-shaped cooling-liquid seal, one leg of which has a liquid head which corresponds to an arbitrarily selected maximum pressure. The other, shorter leg is connected to a central distributor for the individual grate elements of the grate stages. The distance between the lowest point of the coolant flow of the lowest grate element and the upper point of the shorter leg corresponds to a selectable safety height amount which generates a pressure which counteracts the spread of steam bubbles occurring in the grate elements, so as to prevent a reversal in the direction of flow of the coolant.

Abstract: A plumbing system which, when ambient outdoor temperatures drop below freezing, circulates water to prevent it from freezing, utilizing a check valve to prevent water from flowing back into the water main and further utilizing a relief valve which can open to the atmosphere and relieve pressure in the system if necessary. The system can have two separate circulation pumps, one for hot water and one for cold water.

Abstract: An integral water circulation apparatus supplies instant hot water at hot water faucets remotely located from the building water heater through a convective circulation flow of hot water from the water heater It is therefore simpler in design, less expensive to install, and more reliable than the more complex prior art systems.

Abstract: A hot water plumbing system comprising a water heater, a delivery location, a delivery line delivering water from said heater to said delivery location, a riser located adjacent said delivery location and extending upward above the level of said heater, and a return line connected adjacent the upper end of said riser and inclined so as to extend gradually downward to an input located adjacent the bottom of said heater to provide a continuous flow of hot water within the system, which ensures immediate and constant delivery of hot water to the delivery location and prevents accumulation of sediment within the system and, hence, minimizes installation and maintenance costs and significantly reduces the amount of wasted water. The system particularly employs a vacuum accelerator, which can be used to increase system vacuum and which causes rapid start-up or priming of the system.

Abstract: A hot water supply system is provided, which includes a ring pipeline which extends through a water heater and in which water circulates, before going through tap pipelines to taps. The circulation pipelines have a substantially smaller cross-section than that of the tap pipelines. The circulation pipelines extend, for a portion thereof, in the interior of the tap pipelines before terminating openly in a region of a tap. A pipe branch piece is included, which is in the form of a continuous pipe and forms a component of the tap pipeline. A branch pipe of the pipe branch piece receives the circulation pipeline. The branch pipe forms an acute angle with the tap pipeline, with the angle being opened opposite to the flow direction in the tap pipeline. The section of the circulation pipeline, which extends to the tap, is inserted endways into the branch pipe, while the remaining section of the branch pipe joints at the branch pipe and at the ring pipeline.

Abstract: A device for effecting secondary circulation of water into a hot water tank not having a return opening. The arms of a T-fitting are place in series with the distribution line near the outlet port of the water tank. A return line, continuous at one end with the distal portion of the distribution line, is continuous at the other end with a relatively small internal line which lies within the leg of the T-fitting, one arm of the T-fitting, and extending through the outlet port into the water tank. A relatively low power pump and a sinking-ball valve are placed in series with the return line to cause the flow of water in the secondary circulation system to flow in one direction only.

Abstract: The invention refers to a mixer valve, particularly for heating and hot water installations, which is integrated into the housing of a circulation pump in such a manner that the wheel-shaped actuator, which is provided with blades, and the running wheel of the circulation pump are arranged with flush axles, so that the mixer actuator can be adjusted by means of coupling links which can be inserted or removed in relation to the running wheel of the circulation pump via a controllable coupling. According to the invention, the actuator is designed in such a manner that, independently of the position of the actuator and/or its blade, a water exchange in the order of magnitude of 10% of the water throughput will take place even in the blocked position, so that the water returning from the heating circuit is mixed and thus warmed prior to returning into the boiler.

Abstract: The present invention consists in a distributing unit to be connected to a central hot water supply system, said unit comprising a housing consisting of two longitudinally extending pipes located one within the second, a number of primary pipes located in pre-determined distances and extending perpendicularly to said longitudinal pipes and terminating in the outer one; and secondary pipes extending within said primary pipes and terminating in the inner one of said longitudinal pipes. The invention also consists in a central hot water supply system which comprises such distributing unit.

Abstract: A system for freeze protection of pipes is provided, comprising a cold water supply line, connected to a main water supply line at one end and to at least one cold water fixture at the other end; a hot water tank having an inlet and an outlet; a hot water tank inlet line, connected at one end to the cold water supply line, and at the other end to the hot water tank inlet; a hot water supply line, connected to the hot water tank outlet at one end and to at least one hot water fixture at the other end; at least one restrictive connection, connecting between the cold water supply line and the hot water supply line; and a circulating pump, connected in-line in a circuit comprising the cold water supply line, the hot water tank inlet line, the hot water tank, the hot water supply line and the restrictive connection.

Abstract: A freeze protection system allows the working fluid contained in the communicating tubes of the solar collector to drain from both the input and output tubes of the collector when a first predetermined temperature of the working fluid is detected and to fill the collector via both the input and output tubes when a second predetermined temperature is detected. The invention includes valve mechanism, of the spool valve variety, that communicate the working fluid to be heated to the collector and therefrom to a storage tank, a valve actuator and a sensor.

Abstract: An animal watering apparatus has a thermal insulated tank having a water storage chamber. An upright tubular member located in the chamber has openings in its opposite ends to permit thermal circulation of the water in the chamber. Animal actuated water dispensing nipples mounted on the tank are surrounded with thermal insulated housings. Thermal insulated covers mounted on the housings with flexible sheets cover the outer ends of the nipples.

Abstract: A system for providing temporary water service between a water main and one or more locations normally connected to the main in which a pipeline is provided above ground and has a supply section and a return section which are connected to the main. Each of the locations are connected between the supply section and the return section. The water is circulated from said supply section, through said location and to said return section in response to the ambient temperature dropping below a predetermined value.

Abstract: A passive thermosiphon loop of circulating heat transport liquid transfers heat from an inclined absorber to a heat exchanger in thermal contact with a second fluid. Reverse thermosiphoning under normal conditions is prevented by a ball type check valve. Due to differences in the thermal expansion between the valve ball and the transport liquid, the valve will, however, permit reverse thermosiphoning at high temperatures.

Abstract: A check valve for a thermosiphoning solar energy system having a buoyant movably disposed element situated between primary and auxiliary valve seats. Under normal operating conditions flow enters the top of the valve and passes downwardly through the primary seat thereby dislodging the movable element from its seated position. The element, however, is designed to have a density greater than the fluid at high temperatures, which causes the element to lodge in the auxiliary seat to prevent the further flow of the thermosiphoning fluid.

Abstract: A unidirectional valve for use, e.g., in a thermosyphon solar heating system including a collector, a storage tank, and a liquid having a transfer portion in the collector and a storage portion in the tank, the valve comprising a partition, having a predetermined vertical extent, transversely separating the portions, the partition being transversely spaced such that the surface area of the transfer portion is much less than the surface area of the storage portion, whereby changes in the density of the transfer portion cause the surface thereof to travel vertically along the partition, permitting the transfer portion to flow around the end of the partition into the tank, but changes in the density of the storage portion cause only inconsequential movement of the surface thereof along the partition preventing flow of the storage portion around the end of the partition into the collector.

Abstract: Method and device for maintaining and reinforcing in an accumulation tank a stratified condition of fluid caused by the fluid in the tank when a flowing of the fluid is caused by heating the same. The portion of the fluid in the tank that is to be heated is separated from the fluid in the tank prior to the heating and the heated fluid is permitted to ascend through a liquid column separated from the fluid in the tank and is conducted back into the tank at the fluid-layer that has substantially the same temperature as the heated fluid. The device comprises an accumulation tank in which a tube is arranged substantially vertically from the bottom thereof towards its upper part and the tube receives separated heated fluid which is allowed to ascend through the tube. The tube is provided with openings one after the other along the tube constituting outlets for the heated fluid.