Abstract: A ventilator for a refrigerator which comprises a first frame inserted into a ventilation hole provided in a wall panel of a refrigerator, a second frame inserted into the ventilation hole from the outside of the refrigerator, and a mounting base provided with a valve plate and a valve body. The first and second frames are coupled together with their respective extension portions fitted together. The orientation of mounting of the mounting base in the first frame is varied for using the ventilator either for discharge or for intake of air.

Abstract: An improved radially designed gas manifold is disclosed for the precise mixing and admission of a plurality of gases into a processing chamber, and being characterized by rapid switching from one gas to another or from one set of gas mixture to another set of gas mixture, and yet occupying a minimum of dead space. The radial gas manifold includes a body provided with an axial mixing channel and a plurality of gas conduits formed in the body in parallel spaced relation to the mixing channel and connected thereto. A pair of annular ducts also are formed in the body adjacent its respective ends, with one of the pair connected to both the mixing channel and to each of the gas conduits, and the other of the pair connected to each of the gas conduits and being vented. A pair of valves are mounted in tandem for each of the gas conduits and means are provided to alternately open and close one of the pair of valves.

Abstract: A heated, insulated cover for a portion of a pipeline with valve and backflow preventer components exposed to the atmosphere, the cover being sectionalized so as to be assemblable around the valve components, with hand manipulated clamps to hold the cover together, an electric heating element inside the cover to keep it above freezing temperature, drain openings in the cover at ground level to let any water drain out of the cover, doors in the cover to permit inspection and testing of the components when the cover is in place.

Abstract: A fluid control valve and method of making same are provided wherein such valve comprises a valve body structure having a fluid flow passage therethrough and a first sealing surface and a closure structure for controlling fluid flow through the passage with the closure structure having a second sealing surface adapted to engage the first sealing surface to shut off fluid flow through the valve and wherein such valves comprises a substantially annular heat exchange device comprising at least one of the structures and being disposed immediately adjacent the sealing surface thereof for controlling the temperature of at least one of the sealing surfaces.

Abstract: An electrically heated fuel pick-up assembly insertable into a motor vehicle fuel tank for defrosting and dewaxing the fuel therein at the fuel pick-up point includes an inner tube substantially coextensive with and disposed within an outer tube in spaced relationship thereto to define therewith a fuel flow passage therebetween. The inner and outer tubes are immersed within the fuel tank and are supported by a base member attached to one end of the outer tube. A flexible PTC resistance strip heater of the type which automatically adjusts its heat output in response to fuel temperature is spirally disposed along the entire length of the passage on ribs secured to the inner tube for heating the fuel flowing through the passage from a fuel inlet in the end of the inner tube opposite the base member to a fuel outelt in the cap member communicating with an engine fuel supply line.

Abstract: A supplemental electric water unit for immediately providing hot water of a desired temperature at a point of use, such a hot water faucet, when the standing line hot water from a remote conventional water heater is of insufficient temperature includes a small insulated tank interposed in the supply line immediately before the point of use. The tank is provided with a thermostatically controlled electric heater for maintaining the water the tank at the desired temperature. An inlet passage directs inflowing water from the supply line to the bottom of the tank and an upper water outlet connects the tank to the point of use. A thermostatic valve in the water inlet passage opens to automatically to bypass inflowing water of proper temperature directly to the top of the tank for discharge through the outlet.

Abstract: A pump system for use with an air operated instrument system of an aircraft. A primary pump is connected to an air operated instrument and a backup pump is provided in the event of failure of the primary pump. Heated air from the discharge port of the primary pump is used to heat the backup pump during operation of the primary pump.

Abstract: A skin effect heat generating pipe for use with a low frequency alternating current source includes a ferromagnetic pipe (e.g., steel) having thickness substantially greater than the penetration depth of the current of the frequency of the power source. A shunt conductor in the form of an electrically conductive metal layer (e.g., copper) is applied as a discrete layer to the inner surface of the pipe and in electrical contact therewith throughout the length of the shunt conductor, thereby forming a parallel resistance circuit wherein both the shunt conductor and pipe each are capable of conducting substantial current. One end of the pipe is electrically connectable to a first terminal of the power source. A return conductor installed in the pipe and electrically insulated therefrom has one end electrically connected to the second end of the pipe and its other end electrically connectable to the other terminal of the power source.

Abstract: A flexible electrically heated hose of substantially uniform construction throughout its length for transmitting hot liquid material includes a flexible polymeric tube encased within a braided metal covering and having hydraulic fitting at its opposite ends. Multiple plies of heat and electrical insulative material are helically wrapped around the braided covering and a least one electrical heating line is helically wrapped and embedded within the multiple plies. A molded plastic cuff is secured to each end of the hose and an exterior ply of corrugated polymeric tubing is provided about the exterior of the hose to prevent kinking and breaking of the hose at each hose cuff caused by severe bending forces at that location. The exterior of the corrugated tubing has annular ribs separated by annular recesses into which annular ribs on the interior of each cuff extend to secure the cuffs to the corrugated tubing.

Abstract: An oil filtering machine for filtering the hot cooking oil in the cooking vessel of a deep fryer unit when the deep fryer unit is in normal use. The machine includes an oil filtering unit, a motor driven pump and a liquid circulating system in which the pump is connected and which is connected with the deep fryer unit and the oil filter unit. The liquid circulating system includes a pair of suction lines extending from the pump to the deep fryer and oil filtering units and a pair of liquid return lines extending from the pump to the deep fryer and oil filtering units and valve means controlling the flow of oil through the suction lines to the pump and from the pump through the return lines.

Abstract: There is disclosed a self-pressurizing container for liquid helium which comprises an inner and outer vessel with an insulating space between. A heating element is disposed within an insulating barrier tube which extends between the liquid and vapor phases of the helium. The barrier tube insures that the liquid helium is heated and vaporized in the barrier tube without substantially heating the bulk of the liquid helium. The heating element in the preferred embodiment includes a vapor heat exchanger.

Abstract: A multi-functional air heater and compressor is provided and consists of a cylindrical housing having a closed bottom and an open top, an electric fan affixed vertically in the bottom of the housing, first screen affixed around circumference of the housing to provide an air inlet for the fan, electric filaments for heating the air placed within the housing above the fan, a second screen affixed near the open top of the housing to provide a large air outlet and a plate for directing the air into a plurality of small outlets, the plate located at the open top of the housing.

Abstract: Ink jet apparatus for use with hot melt ink has an integrally connected ink jet head and reservoir system, the reservoir system having a sloping flow path between an inlet position and a sump from which ink is drawn to the head, the reservoir being housed in a housing of good heat conductivity material with a heater connected thereto, and further having one or more heat conducting elements positioned between the inlet position and the sump, which elements are constructed to act both as baffles and as heat conducting fins.

Abstract: A series-connected, skin-current heating pipe circuit includes a first ferromagnetic pipe; a first insulated wire extending along and inside the first pipe; a first AC source connected to one end of each of the first pipe and first wire; and an impedance element, such as a resistor, capacitor or reactor connected between the other end of each of first pipe and first wire. A current trouble detector is provided in either line connecting the first AC source to the one end of the first pipe or the one end of the first insulated wire to detect a current trouble due to an insulation problem at any point of the first insulated wire.

Abstract: An electric pipe thawing apparatus for thawing frozen water pipes by passing electric current therethrough incorporates various safety feature rendering the apparatus fail-safe in operation. The apparatus includes an A.C. generator from which can be obtained through a step-down transformer arrangement various voltage levels, from 12 volts upwards, for applying low voltage high current power to the pipe to be thawed. One important safety feature prevents the application of a higher voltage to the pipe unless at a lower voltage level, for example, 20 volts, it has been established by measurement that the current flow in the pipe is above a predetermined level and consequently the circuit through the pipe is a good one. If the circuit is not good, when the operator switches to a higher voltage level a danger signal is illuminated.

Abstract: An electric heating apparatus for providing freeze protection for a fluid-control device, such as a gas regulator, at a well site includes a flexible electric heating pad adapted to be wrapped around the control device to be freeze-protected and a two part thermally insulated housing adapted to be placed about the heating pad and control device when the apparatus is installed. The heating pad is adapted to be energized from a rechargeable battery under the control of a thermostat within the housing which disconnects heating pad from the battery when the temperature in the housing rises above a temperature of about 40.degree. F. A solar panel provides direct current for recharging the battery. A second thermostat disconnects the solar panel from the battery when the ambient temperature rises above about 50.degree. F. to terminate charging of the battery.

Abstract: A flexible heated hose for transporting molten adhesive from a melter to a dispenser. The hose comprises a Teflon tube contained within stainless steel braided wire and fitted with conventional hydraulic fittings at each end. The braided tube is encased within a multiple ply covering which includes a first layer of fiberglass tape around which are wound electrical resistance heating wires, a resistance temperature detector, electrical leads including a ground wire, and two plies of helically wound fiberglass tape, with a layer of helically wound Aramid fiber, two layers of helically wound polyester felt, and a layer of helically wound vinyl tape covering the same. The heating wires, electrical leads, and temperature detector are adhesively secured to the first layer of fiberglass tape which is in turn adhesively secured to the stainless steel braided wire covering the Teflon tube. In a modified embodiment, the ground wire is wound separate from the other electrical leads.

Abstract: An air dryer device for a compressed air system of a vehicle includes a housing and a dryer mounted within the housing and containing a desiccant for drying compressed air from a compressor of the compressed air system. A drain valve is mounted within the housing and includes a valve body having a valve port and a valve seat. A hollow elongated control piston is mounted within the valve body for movement along an axis thereof. A valve element is mounted on the control piston and is normally urged into sealing engagement with the valve seat to close the valve port. The control piston is responsive to a pneumatic signal from an air governor of the compressed air system for being moved along its axis to bring the valve element out of sealing engagement with the valve seat to open the drain valve. An elongated heater member is mounted at one end on the valve body for generating heat. The heater member is received in an axial bore of the control piston.

Abstract: Ink jet apparatus for utilizing hot melt ink is provided, comprising a printing head and a reservoir for holding a supply of hot melt ink, the reservoir having a normally open port or fill tube with an end face residing within the volume of the reservoir, the end face being located at about the volumetric center of the reservoir. The reservoir is maintained with an ink volume of no more than about half of the reservoir volume, so that ink can not spill through the normally open port when the apparatus is tilted.

Abstract: An electric heating device for heating motor vehicle glass washing fluid includes a pair of plate-like non-metallic body elements each having a spiral channel formed therein and sealingly closed by a copper cover plate. The cover plates are juxtaposed and sandwiched therebetween an electric heating element in the form of a PTC thermistor connected to the vehicle battery through a suitable switch. A thermostat is connected in series with the thermistor and is mounted on and responsive to the temperature of one of the cover plates. The thermistor is calibrated to reach a temperature substantially higher than the desired fluid temperature to ensure rapid heating of the fluid and the thermostat as activated at the desired fluid temperature to prevent overheating of the fluid. The spiral channels are connected in series at one end and the opposite ends thereof are connected, respectively, to a washing fluid reservoir and spray nozzles for spraying heated fluid on the vehicle glass.

Abstract: A ventilator for a coldroom with pressure responsive valves wherein a first valve plate becomes free from a partition wall so as to open a first valve port when internal pressure is increased, and a second valve plate becomes free from said partition wall so as to open a second valve port when internal pressure is reduced. Electric heaters are disposed at supporting rib portions between said respective valve ports and at outer peripheral portions of said valve ports or in the vicinity of those portions, thereby to heat contact portions of said valve plates with said partition wall. The ventilator can be precisely and susceptively operated in response to changes of internal pressure without fear of malfunction due to freezing.

Abstract: Improved apparatus for providing both a liquid level control and a low water cut-off for boilers and the like, having only a single probe and a single relay.

Abstract: A used cooking oil disposal system for receiving oil from a building includes an oil receiving means inside the building communicating with an external, insulated, cylindrical holding tank having thermostatically controlled heater means servicing at least a part of the tank and a discharge outlet connectable through valve means to a pump for removing the oil from the tank.

Abstract: A temperature control system for a liquid chromatographic column includes a thin film heater/sensor comprising a foil-like patterned heating element adhesively mounted between a pair of flexible electrically insulative layers. A patterned foil-like temperature sensing element is also coextensively adhesively mounted between the insulative layers in temperature sensing relationship to the heating element. The thin film heater/sensor is wrapped around the chromatographic column and is uniformly compressively secured in contact therewith by a spirally tubularly wound length of flexible wrapping. A remote temperature sensing element controls the heat output of the heating element a linear proportional fashion, thereby maintaining a predetermined temperature gradient over the length of the column. A pre and post-column heaters may be similarly wrapped with a thin film heater/sensors so as to appropriately control the temperature of the liquid entering or leaving the column.

Abstract: An electric heater structure designed to be used as an auxiliary water heater for showers, sinks and the like includes a housing defining a water heating chamber having an inlet for connection to a water supply pipe and an outlet for discharging heated water through an attached sprayhead. A pair of electric resistance heating coils of different length and thus different heat output are positioned within the chamber for heating the water. A selector switch manually operated by a lever is provided in a switch casing mounted on the housing and is arranged to energize one or the other of the heating coils to produce either hot or warm water. A set of diaphragm actuated contact elements cooperate with the selector switch to allow energization of the heating coils only if water is flowing through the chamber from the inlet to the outlet thereof.

Abstract: A water heater capable of generating water at any temperature from ambient mains temperature to boiling and also for generating steam on demand includes a closed water tank having a water inlet with a valve for allowing or preventing ingress of water into the tank, a non-return valve for preventing water from the tank flowing back into the main supply and a pressure reducing valve for ensuring that the water pressure in the water inlet pipe and in the tank does not exceed a preset value, a water level transducer for detecting the water level in the tank, a heater for heating the water in the tank, a temperature sensor for detecting the temperature of water in the tank, a hot water outlet arranged towards the bottom of the tank, preferably a mixing valve in the hot water outlet mixing hot water leaving the tank with water at ambient mains temperature, a steam outlet arranged towards the top of the tank, and a controller receiving signals from the water level detector, the temperature detector and a programmer

Abstract: A separable junction for an electric pipeline system of the type including a tracer for skin-effect heating, which tracer comprises an insulated conductor within an electrically conductive conduit, incorporates flanges at the ends of the pipe section to be joined and the pipes are joined by securing bolts through holes in the flanges. Each end of the tracer conduit on each of the sections of pipe is terminated at and electrically connected to a metallic junction box adjacent to a flange and the tracer conductor thereof extends into the box. Each box has an opening aligned with one of the flange holes for the fastening bolts, but when the junction is assembled, the flange bolt which would be in alignment with the junction box opening is replaced with a hollow, threaded metallic nipple which is dimensioned to fit freely through the bolt holes in the flanges and is long enough to extend between and into the openings of the junction boxes at either side of the junction and electrically connect the boxes.

Abstract: An intravenous fluid warmer includes an electrically heated warmer module receiving a low volume (10 ml.) disposable cartridge through which the fluid being heated flows. The module is configured as two spaced concentric elongated metallic heating elements having attached electric heaters and defining therebetween an elongated plenum adapted to receive the disposable cartridge. The temperature of the heating elements is individually monitored by separate sensors and an electronic temperature control module maintains the inner heating element at a slightly higher temperature (36.degree. C.) than the temperature (34.degree. C.) at which the outer heating element is maintained. The inner heating element is free floating through a limited range to accommodate manufacturing differences is the disposable cartridge. The cartridge, made of polystyrene or polycarbonate plastic, nests in the plenum in contact with the heating elements.

Abstract: An electrically heated reactor for high temperature and pressure chemical reactions includes a reactor vessel having an inlet opening for introduction of raw material onto the reactor and an outlet opening for removal of heated material from the reactor. An electric heating assembly extends through the inlet opening into the interior of the vessel and includes a metallic inner tube through which raw material can be introduced into the vessel and an outer ferromagnetic tube arranged in spaced concentric relationship with respect to the inner tube and generally coextensive in length therewith. The innermost ends of the tubes are electrically connected to each other by a metallic member which seals the space between the tubes. An electrical insulating medium is disposed within the space.

Abstract: A boiling water heater incorporating a tank with electrical heating element and water level control wherein the supply of current to the element is controlled by the temperature in an inclined condenser tube extending upwardly from the top of the tank. The condenser tube incorporates a steam exhaust flue, a temperature sensing bulb and a cold water inlet. The temperature sensing bulb is located with its lower end adjacent the cold water inlet into the condenser tube but below the steam exhaust flue outlet from that tube. The thermostat controls the operation of the heating element and the water level control valve so that the element is disconnected from the electricity supply and the control valve opened in response to the temperature in the condenser tube being above a predetermined lower limit when the water level in the tank as sensed by the water level control is above a predetermined lower limit.

Abstract: A flexible electrically heated hose for transporting molten adhesive from a melter to a dispenser. The hose comprises a Teflon tube contained within stainless steel braided wire and fitted with conventional hydraulic fittings at each end. The braided tube is encased within a multiple ply covering which includes electrical resistance heating wires and a resistance temperature detector adhered between two plies of helically wound fiberglass tape. This tape is covered by multiple plies of helically wound, double thickness fiberglass paper between the plies of which there are embedded spiral wound electrical leads to the dispenser. The fiberglass paper layer is encased within two layers of helically wound polyester felt, a layer of helically wound vinyl tape, and a braided polyester cover. Hard molded plastic cuffs are attached to the ends of the hose. The electrical leads to the heating wires, temperature detector and dispenser extend radially from the hose through holes in the cuffs.

Abstract: An oil burner system includes a burner nozzle connected to a supply of fuel oil by a nozzle assembly having integrated therein an electric heater for prewarming the oil fed to the nozzle. The nozzle assembly has first connector at one end directly connected to the burner nozzle and a second connector at its other end directly connected to an oil supply conduit. The preheater comprises an elongated rectangular PTC heating resistor having a pair of parallel sides of greater width than the thickness of the resistor and coextensive electrical contacts extending longitudinally and transversely in electrical engagement with the parallel sides. A pair of parallel flattened thin wall metal conduit sections extend coextensively between the first and second connectors and define thin unimpeded generally rectangular cross section flow path for the oil to be heated.

Abstract: A hot melt hose has multiple electrically heated hose sections physically and electrically interconnected end-to-end between a pressurized hot melt source and hot melt dispenser, such as a hand-held gun having a trigger-controlled valve for regulating the flow of hot melt from the gun. Each of the hose sections includes an inner, fluid impervious, chemically inert tube, preferably fabricated of tetrafuoroethlene; an electrically conductive multi-strand braided resistance heating sheath snugly embracing the exterior surface of the inner tube and in intimate heat transfer contact therewith for supplying strength and heat to the tube; and an outer sheath of thermal insulating material for minimizing heat loss. The hose sections are interconnected by a heated joint which comprises electrically conductive hose end fittings electrically connected to the braided sheath and connected by threaded swivel nuts to an electrical insulating fitting.

Abstract: A solenoid valve for controlling the flow of hot melt material such as hot melt adhesive. The valve includes an aluminum body in which is disposed a heater cartridge for supplying heat energy to the body. The body is bored to receive an insert constructed of brass of like material having good heat conductivity and the insert defines a cylindric passage. Extending through the cylindric passage is a valve stem that has an outer diameter less than the inner diameter of the cylindrical passage so that an annular flow path is formed. Hot melt material supplied to one end of the annular flow path flows to a valve seat at the other end of the flow path. The diameters of the cylindric passage and the valve stem are established so that the annular path has a sufficiently small radial dimension (e.g. 0.004 inch) that the hot melt material in the path is rapidly and efficiently heated so that when discharged through the valve seat it will be at a suitable operating temperature.

Abstract: A valve for controlling the flow of fluids containing abrasive particles including thermally-actuated means for ensuring a tight seal between the movable valve element and the valve body in both the open and closed positions. The thermally-actuated means is deactivated when repositioning the movable valve element and reactivated to provide a tight seal when the movable valve element is in position.

Abstract: A conduit for high temperature transfer of molten semiconductor crystalline material consists of a composite structure incorporating a quartz transfer tube as the innermost member, with an outer thermally insulating layer designed to serve the dual purposes of minimizing heat losses from the quartz tube and maintaining mechanical strength and rigidity of the conduit at the elevated temperatures encountered. The composite structure ensures that the molten semiconductor material only comes in contact with a material (quartz) with which it is compatible, while the outer layer structure reinforces the quartz tube, which becomes somewhat soft at molten semiconductor temperatures. To further aid in preventing cooling of the molten semiconductor, a distributed, electric resistance heater is in contact with the surface of the quartz tube over most of its length. The quartz tube has short end portions which extend through the surface of the semiconductor melt and which are lef bare of the thermal insulation.

Abstract: A transportable apparatus for accommodating a substance to be shielded from the environment, which may be disposed in a receptacle, has a pressure vessel provided with an opening which can be sealingly closed by a door with the substance therewithin, and a container within which the vessel is disposed.

Abstract: An inlet for use in a ventilating system having a frame defining an opening and provided with an inwardly directed lip, a panel mounted for rotation within the frame and including flanges which abut the lip when the panel is in closed position, an electrical heating cable secured to the frame in the vicinity of the panel, and a system for rotating the panel and energizing the heating cable, when desired.

Abstract: An energy saving control circuit for a water heater having a hot water storage tank provided with an electrically operated heater, i.e., an electric heater or an electrically controlled combustion burner, includes a water flow detection device associated with either the cold water inlet or hot water outlet of the tank for sensing the flow of water into or out of the tank and arranged to energize the heater upon detection of water flow indicative of the withdrawal of water from the tank. A holding circuit maintains the heater energized, even though the flow of water ceases, until such time as a thermostatic switch responsive to the temperature of the water in the tank disables the holding circuit and deenergizes the heater upon the water stored in the tank attaining a predetermined desired temperature.

Abstract: A shower-sauna apparatus includes an electrically insulative container for accomodating a volume of water to be heated. A vertical central tube extends through the container and has a threaded upper end adapted to be connected to a source of water and a threaded lower end through which steam or hot water is discharged into a sauna-shower area defined by a flexible curtain suspended from a flat dish-shaped member secured to the threaded lower end of the central tube and defining the top wall of the sauna-shower area. A plurality of spaced, tubular electrode plates are disposed in the container and are adapted to be connected to an electric power source for passage of electric current through the water between the plates to generate Joule heat for automatically and instantaneously heating the volume of water to enable generation of either steam or hot water. The central tube is divided by a stopper into an upper water inlet portion and a lower steam or hot water outlet portion.

Abstract: A compact induced heat-generating pipe useful for shorter bodies to be heated, such as small scale pipelines, the heat-generating pipe consisting of at least one set of two or three ferromagnetic pipes and an insulated wire passing therethrough and connected to an A.C. source, the respective pipes being electrically connected to each other at both the respective ends; thickness t of the pipes having a relationship of 0.5 s.ltoreq.t<s, wherein s is the skin depth of A.C. flowing through the pipes; the pipes of each set being brought into close proximity to each other; and the length of the pipes being 1 Km or shorter.

Abstract: An immersion nozzle for continuous casting resistant to the corrosive action of the melt and the covering material in a mold is made of a refractory material comprising a mixture of electrically conductive graphite and/or silicon carbide, at least one member selected from the group consisting of alumina, zircon, zirconia, fused silica and a metallic silicon, and a binder. The nozzle is covered with a thermal insulating cover having a thickness of approximately 60 mm and made of fused silica containing fibers. The nozzle is preheated without moving it from its operating position by connecting a pair of electrical terminals to opposite ends thereof and passing electric current through the nozzle between the terminals for a period of time sufficient to raise the temperature of the nozzle sufficiently to prevent cracking, spalling, etc. during casting operation. After the preheating is completed the terminals may be removed from the nozzle.

Abstract: A compact glue heater for heating the flow of glue to a labeling machine has two spaced apart metal plates welded together at their edges and a rib running part way along the center of the space to define a U-shaped conduit between the plates. A glue inlet pipe connects to one end of the conduit and an outlet pipe connects to the other. Electric heaters composed of heat resistant insulating sheets with electrically resistive material between them interface with the outside surfaces of the respective conduit forming plates to form a heater and conduit assembly. The heater and conduit assembly is sandwiched between metal plates secured together by spacer blocks at their corners to form a unitary assembly removably supported on the spacer blocks in a cavity in a closed housing in spaced relationship to the walls of the cavity thereby inhibiting heat transfer through the housing.

Abstract: An apparatus for dispensing material from a container comprising a plate having an aperture therein through which material is caused to flow out of the container when the plate is caused to move vertically within the container. A scraper member is spaced from and coupled to such plate to engage the inside walls of such container to scrape material from the walls as the plate moves vertically relative to the container. A space is formed between the scraper member and the plate to form a cavity which communicates with the aperture and which includes a material entering opening, the level of material in the cavity being controlled during operation of the apparatus.

Abstract: Heating apparatus for heating of a fluid. The heating apparatus comprises a conduit having a fluid passage therethrough for conduction of a fluid to be heated, a heating device, such as for example electrical heating plates, in heat transfer contact with a portion of the conduit for heating the fluid being conducted therethrough, and a temperature sensing device positioned in engagement with the conduit at a predetermined location along the conduit external to the conduit for sensing the temperature of the fluid to be conducted therepast. A contact member is arranged to engage the flexible conduit at the predetermined location for compressing the flexible conduit to constrict the cross sectional area of the flow passage thereat when the flow rate of the fluid is below a predetermined flow rate. Preferably, the contact member is spring biased towards the flow passage constricting position, and is movable away from such position when the flow rate exceeds a predetermined flow rate.

Abstract: The invention relates to an atomizer burner assembly for oil burners. The assembly has electric heating apparatus for maintaining a relatively constant temperature for the oil supply over a range of throughputs which may vary for different atomizer nozzles, for example, from 0.5 to 2.5 l/h. The heating apparatus includes a PTC resistor mounted in the supply pipe in series with a near zero temperature coefficient heating element which surrounds the supply pipe at a longitudinal position between the PTC resistor and the atomizer nozzle. The PTC resistor controls the heat generated by the heating element in accordance with the temperature of the throughput oil to maintain a constant temperature for the throughput oil.

Abstract: An automatic continuous boiling water heater unit has a water heating tank incorporating an electric heating element near the bottom thereof and a float operated valve for feeding water to the heating tank from a level control tank mounted alongside the heating tank through a constricted conduit designed to allow a water flow rate substantially equal to the boiling water heating rate capacity of the element. A temperature control device, including a temperature sensitive probe surrounded by a metal gauge and positioned in a conduit communicating the level control tank with the heating tank above the water level therein maintained by the float operated valve, is provided for deenergizing the heating element when the water in the heating tank reaches boiling temperature.

Abstract: An arrangement for supplying molten plastic material in heated condition to an injection mold has a plurality of heating passage forming elements which are formed as separate units capable of being mechanically assembled with one another, and each provided with a housing having at least one inlet and one outlet opening, and with an electrical heating member which is electrically controlled independently of the heating members of other heating passage forming elements.

Abstract: Faster and more efficient heat transmission between an electrical skin effect current heat generating unit and the surface of a pipe to be heated is achieved by utilizing convective as well as conductive transfer of heat therebetween. The unit includes an elongated ferromagnetic channel having an open face and secured along its longitudinal edges by staggered stitch welds to the surface of a ferromagnetic pipe to be heated. The inner surface of the channel and the confronting outer surface of the pipe define an air space at least partially surrounding a freely movable insulated conductor having one end connected to a pole of an AC source and its other end connected to the far end of the channel. The near end of the channel is connected to the other pole of the AC source.

Abstract: The invention relates to an atomizer burner assembly for oil burners. The assembly has electric heating apparatus for maintaining a relatively constant temperature for the oil supply over a range of throughputs which may vary for different atomizer nozzles, for example, from 0.5 to 2.5 l/h. The heating apparatus includes a PTC resistor mounted in the supply pipe in series with a near zero temperature coefficient heating element which surrounds the supply pipe at a longitudinal position between the PTC resistor and the atomizer nozzle. The PTC resistor controls the heat generated by the heating element in accordance with the temperature of the throughput oil to maintain a constant temperature for the throughput oil.