Abstract: A liquefied gas, such as liquefied chlorine, which is injected into a liquid stream such as an aqueous stream, in the liquid state, is prevented from causing the liquid stream to freeze by cooling the liquefied gas to a temperature below its boiling point at the pressure of the liquid stream.

Abstract: This invention relates to a method of and a system for supplying ultrahigh purity gas to a process device operated under reduced pressure. The first invention is a method of supplying ultrahigh purity gas comprising the steps of heating, in non-operation of the process device for effecting film making or etching under reduced pressure, a pipe line for supplying ultrahigh purity gas into said device at least for a prescirbed period of time for the purpose of exhausting the ultrahigh purity gas from said pipe line, and stopping said heating of said pipe line in operation of said device and supplying the ultrahigh purity gas from said pipe line into said device via an introduction inlet of said device.

Abstract: An apparatus for producing small clear ice bodies includes an evaporator (110) having freezer cells (12) open at the bottom and cooled by a refrigerant pipe (11). Interspaces between the freezer cells (12) are covered by strips (114) of insulating material. On the outside of the insulating material (114) defrosting components are arranged, formed of metal strips (17). Water is sprayed upwardly out of a trough (30) into the freezer cells by means of a spraying device (20) in the form of a bucket wheel rotatable about a horizontal shaft (29). The bucket wheel has two spaced parallel circular discs (28) with concave splash blades (27) arranged between them. The water sprayed upwardly keeps the metal strips (17) at above-freezing temperatures, so that ice layers cannot form and interconnect the small ice bodies. Splash-guard walls (33), as well as a movable splash-guard flap (32), prevent the escape of water from the apparatus. When defrosted, small ice bodies (1) fall onto an inclined grid (36).

Abstract: The disclosed gaseous fuel torch apparatus is adapted for use in cutting, welding, heating or other such operations involving the heating, cutting, or fusing of either metallic or non-metallic materials. The apparatus includes a fueling module for supplying gaseous fuel to a torch at an elevated pressure from a relatively low pressure gaseous fuel source, such as a natural gas supply system for example. The fueling module also preferably includes a selectively-operable alternate system for supplying such compressed gaseous fuel for other applications, including the recharging of one or more storage vessels for example. The fueling module includes features by which its gaseous fuel discharge pressure can be infinitely varied and preselectively adjusted within the capabilities of the fueling module's compressor device.

Abstract: A fluid monitoring and control system for use with such electromechanical apparatus as integrated drive generators, or the like, which include a casing and a rotatable shaft extending into the casing. A rotatable chamber is connected to the shaft for rotation thereby and for converting the volume of liquid in the chamber into a centrifugal liquid pressure head in response to rotation of the chamber. A pump scavenges liquid from the casing and delivers the scavenged liquid to the rotatable chamber. An accumulator is hydraulically coupled to the rotatable chamber for receiving liquid therefrom when the liquid level reaches a predetermined maximum level. the accumulator supplies liquid therefrom to the casing, through the rotatable chamber, when the liquid level reaches a predetermined minimum level.

Abstract: In a liquid metal heat transport system including a source of thaw heat for use in a space reactor power system, the thaw flow throttle or control comprises a fluid passage having forward and reverse flow sections and a partition having a plurality of bleed holes therein to enable fluid flow between the forward and reverse sections. The flow throttle is positioned in the system relatively far from the source of thaw heat.

Abstract: A device for protecting installations for the storage or supply of a freezing liquid, in particular water, against freezing, comprising at least one heat tube or heat pipe having one end placed in the ground at a distance from the surface sufficient so that the temperature at this location is always above 0.degree. C., the end being equipped on the outside with a fin type heat recovery system or the like, and on the inside with a system for the distribution of the condensate drip, while the other end of the heat pipe is laid out and arranged so that it is located in the immediate vicinity of the part of the installation exposed to the risk of freezing, and the application of the device to installations for the storage and distribution of water.

Abstract: The disclosed gaseous fuel torch apparatus is adapted for use in cutting, welding, heating or other such operations involving the heating, cutting, or fusing of either metallic or non-metallic materials. The apparatus includes a fueling module for supplying gaseous fuel to a torch at an elevated pressure from a relatively low pressure gaseous fuel source, such as a natural gas supply system for example. The fueling module also preferably includes a selectively-operable alternate system for supplying such compressed gaseous fuel for other applications, including the recharging of one or more storage vessels for example. The fuelilng module includes features by which its gaseous fuel discharge pressure can be infinitely varied and preselectively adjusted within the capabilities of the fueling modules's compressor device.

Abstract: Safety mechanisms for a plumbing fixture supplying hot and cold water through a common line. One mechanism is mechanical and the other electrical. The mechanical mechanism makes use of a mechanical linkage between the hot-water valve and an auxiliary cold-water valve to flush residual hot water out of the common line with an excess of cold water. The electrical mechanism uses a microprocessor to activate the cold-water valve when the hot-water valve is shut of, this flushing the residual hot water out of the line with an excess of cold water.

Abstract: A valve body 10 supports a rotary valve member 20 having a transfer port 22. Sealing between a port 17 of the valve and the member 20 is achieved by a sleeve 30 movable towards and away from the member 20. In a valve closed position seal means in a flat end of the sleeve engage a flat base of a recess in the member 20. The member 20 may be provided with a rotary scraper 41 and heaters located in channels 40 and in this construction the valve is suitable for transferring sodium-cooled nuclear fuel between various localities.

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 fluid controller for a fluid supply system such as the plumbing supply system for a bathroom comprises hot and cold fluid temperature sensors and flow sensors which are installed in respective ones of the hot and cold fluid supply pipes upstream of the fluid discharge outlet. Hot and cold fluid flow control valves operated by valve motors are also installed in such pipes. The sensors and motors are connected to a microprocessor including a comparator means which is operative to compare values programmed in a memory means with signals received from the sensors so as to generate control signals for the motors so as to obtain a desired fluid temperature and flow rate at the discharge outlet. The controller can be installed in an existing plumbing system without disturbing the existing faucets and manual control valves. Alternatively, the controller can be used in a new installation with or without manual control valves.

Abstract: A fill valve assembly installed in a toilet flush tank includes a pressure relief valve adapted to activate at a predetermined pressure to discharge water from a system of piping to relieve pressure due to thermal expansion of water in the piping system.

Abstract: A butterfly valve for controlling high-temperature fluid including a ceramic valve is disclosed. The butterfly valve exhibits excellent high-temperature sealing and heat insulating characteristics and strength sufficient to rigid support the valve disc therein. The valve comprises a valve stem and a valve disc integrally formed of ceramics and is housed in a casing through a valve guide opening and the valve guide opening is closed with a plug through which the valve stem is inserted.

Abstract: A method of temporarily storing a producer unit effluent, during the transmission of the effluent from the producer unit to a user unit at a predetermined user unit flow rate, in which excess producer unit effluent is passed to a storage unit through a single bidirectional flow line and make-up producer unit effluent is passed from the storage unit through the bidirectional flow line to the user unit. The feed rate to the user unit is controlled to maintain a predetermined feed rate and producer unit effluent, from the producer unit to the storage unit and from the storage unit to the user unit through the bidirectional flow line, is controlled by measuring the back pressure built up in the bidirectional flow line or the flow line from the producer unit to the user unit and permitting flow from the bidirectional flow line to the storage unit and from the storage unit to the bidirectional flow line, as the case may be, in accordance with the measured pressure.

Abstract: In a method for electromagnetically regulating flow and in an apparatus for performing the method, a molten metal flowing in a pouring tube is inhibited in a central region of the pouring tube by an insert member installed in a conduit of the pouring tube and is diverted radially outward. An electromagnetic coil is arranged concentrically about the pouring tube for exerting constrictive electromagnetic forces upon the molten metal and thus regulating the flow of molten metal in a wide range.

Abstract: An assembly for use in a system for heating water comprises a heat exchanger for heating cold water to produce overheated hot water and a blending chamber in which the overheated hot water is mixed with cold water to produce blended hot water. An inlet valve controls the flow of cold water to the heat exchanger. A bypass valve controls the flow of cold water into the blending chamber. A flow restrictor restricts the flow of cold water from the bypass valve into the blending chamber when the demand for blended hot water increases above a predetermined amount.

Abstract: A system for isolating a pressurized water source from a pressurized hot water tank when a leak or rupture occurs to the tank. The system includes a connecting line attached between a check valve and a control valve with a diaphragm attached to the control valve body to sense the pressure differential between the water source and the connecting line. Upon a leak or a rupture occurring, the diaphragm completely closes the control valve. The check valve does not allow the hot water from the water heater tank to enter the domestic system when a leak or rupture occurs. The system further allowing cold water to enter the tank when a predetermined temperature is reached or exceeded. The system further allowing for make up of water volume loss in the tank during a cooling cycle.

Abstract: The invention is directed to a method of performing remotely-manipulated ntenance work on upwardly extending conduits in a radioactively-ladened cell such as a large-area cell of a nuclear facility for reprocessing irradiated nuclear fuel. A conduit segment is sawn out of a vertical conduit and a new conduit segment welded into place. The removal of cutting chips from the lower vertical end portion of the conduit after the conduit segment has been sawn out is achieved by freezing the liquid medium in the conduit to form frost plugs above and below the tube portion to be removed. A third frost plug is formed in the lower portion of the vertical conduit above the frost plug which has already been produced therein. Thereafter, the tube portion to be removed is cut and separated from the conduit. Then an anchor member is lowered into the lower end portion of the conduit onto the third frost plug.

Abstract: A gate valve includes a housing adapted to be installed in a pipeline, the housing having therethrough a flow passage, and a valve member mounted within the housing for movement between a first position, whereat the valve member closes the flow passage, and a second position, whereat the valve member opens the flow passage. The housing and valve member have axially spaced pairs of adjacent annular surfaces cooperating to define seals when the valve member is in the closed position. The housing has therein, adjacent one annular surface thereof defining at least one seal, a duct. Cooling air is introduced into this duct. The one annular surface of the housing has therein structure defining a gap for directing the cooling air from the duct against the respective annular surface of the valve member when closed or into the flow passage when the valve member is open.

Abstract: The invention relates to a valve arrangement for supply steam and cooling water under pressure alternately to a compression moulding tool, via respective inlet valves. Upstream of the inlet valve cooling water taken from the cooling-water circuit is passed to piston arrangements, which act upon the inlet valves, and is used both as a working medium for the piston arrangements and as a cooling agent therefor.

Abstract: A spray gun includes a material inlet and an air inlet. A reciprocating hydraulic motor is connected to and drives a reciprocating hydraulic pump which pumps material from a material reservoir to the pump outlet. A first air piloted hydraulic valve is connected to the pump outlet and the first valve is connected to and is operable to transmit pumped material to either the material inlet of the gun or to the material reservoir. A second motor is connected to and drives a second hydraulic pump which is connected to and supplies hydraulic fluid from a hydraulic reservoir to the reciprocating hydraulic motor. A second air-piloted hydraulic valve is connected between the second hydraulic pump and reciprocating hydraulic motor and is operable to transmit pumped hydraulic fluid to either the reciprocating hydraulic motor or to the hydraulic fluid reservoir. An air control valve is connected to an air supply and is connected to the first and second valves.

Abstract: A slide valve for use in a high temperature gas line is described. The valve is constructed to allow field assembly and disassembly for ease of service, and has insulating means and gas purge means for maintaining the exterior of the valve housing at a low temperature. The valve includes a slide plate which can be provided with a flow opening in either a first location such that the slide plate is in tension when the valve is closed while hot or in a second location such that the slide plate is in tension when the valve is opened while hot.

Abstract: A gate valve assembly for controlling flow of fine particulate solids, utilizing dual seating surfaces and a slidable gate which are either or both purged by an outflowing gas. The valve body is constructed in two split parts, and the body seat surface contains a conduit spaced outwardly from the seat and having a plurality of spaced openings oriented radially inwardly. The gate contains multiple passageways and is connected to a stem adapted for supplying a flow of pressurized purge gas to the passageways arranged to prevent deposits of the particulate solids passing therethrough on the valve seating surfaces. The valve is usually used for high temperature service, e.g. at 300.degree.-1000.degree. F., the valve body and gate are cooled by a vent gas, and the valve body is covered with thermal insulation material. The valve assembly is usually located within the lower end of an insulated container and controls the flow of particulate solids from the container.

Abstract: A system and apparatus operative in a winterizing mode for controllably filling hot and cold water supply lines with anti-freeze to prevent against burst pipes and, in a summerizing mode, for pump recovering the anti-freeze. In one embodiment, the system includes a closed loop, valve containing path having a separate pump, filter and anti-freeze tank. In other alternative embodiments, the water supply tank and a four-way valve are coupled to the closed loop path for switchably operating in the winterizing/summerizing modes, without resorting to a separate pump.

Abstract: A method and apparatus for dispensing large numbers of wine servings at uniform temperatures is disclosed which includes a source (14) of wine at room temperature connected to a refrigeration unit (16). A wine dispensing valve (18) is connected to the refrigeration unit (16) for dispensing wine. A wine metering and mixing valve (A) is connected between a delivery line (20) and a dispensing line (22) to bypass a metered amount of room temperature wine from the delivery line to the dispensing line and thus raise the temperature of the wine to a desired wine serving temperature prior to serving.

Abstract: A pneumatic power supply for use in powering servo controls and actuators s a filament wound composite and aluminum ultra-high pressure vessel containing helium within which there is mounted an internal pyrotechnic heat generating element to provide thermal energy to the system. The heater compensates for adiabatic cooling of the gas inventory during blow down, i.e., during delivery of high pressure gas to power pneumatic servo controls and actuators in missiles. At the beginning of the blowdown, the heater element burns at a predetermined rate which adds heat to the compressed gas so that the gas temperature remains relatively constant, effectively increasing run time. The pressurized gas is delivered by means of a pressure regulator from the pressure vessel to the delivery system for use in the pneumatic control system.

Abstract: A structure of a tank for storage of a suspension is improved in that a conical bottom partition wall is disposed in the bottom portion within a cylindrical outer shell of the tank with its lowest point located substantially at the center of the horizontal cross-section of the cylindrical outer shell. An upwardly extending side wall is provided along the circumference of the conical bottom partition wall and is disposed with an appropriate interval spaced from an inner surface of the cylindrical outer shell. A cover consisting of an annular top wall inclined substantially in parallel to the conical bottom partition wall and a downwardly extending side wall is fixedly secured to the inner surface of the cylindrical outer shell so as to cover the upwardly extending side wall with an appropriate interval spaced therefrom.

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: Apparatus for heating the fuel oil exiting from an oil supply tank and in the supply pipe leading to an oil burner furnace. The return oil line, from the pressure relief valve in the oil burner unit, is led to a coil fitted about the furnace stack leading from the oil burner furnace. The outlet of this heating coil is then led into a metal tempering box, mounted below the tank, through a pipe banded to the supply pipe so as to warm the oil in the supply pipe and the oil in the tempering box. Supply oil is fed from the oil supply tank into the tempering box, to mix with the heated oil in the tempering box, with the mixed warmed oil led from the tempering box into the supply pipe leading to the oil burner of the furnace.

Abstract: This safety ignition device intended notably for controlling the valve through which gaseous fuel is supplied to a burner injector comprises essentially built-in means for protecting the circuitry from transient overvoltages and current surges, notably a varistor for limiting peak voltages and currents, absorbing disturbing energies and stabilizing pressures.

Abstract: A liquid reservoir has a rectangular shell in which crossed first and second partitions form first, second, third and fourth rectangular liquid chambers. The partitions are impervious between the first and fourth chambers and apertured between the first and second, second and third, and third and fourth chambers. Liquid flows serially through the first, second, third and fourth chambers via the apertured partitions and such flowing liquid is subjected to a heat exchange in the first, second, third and fourth chambers.

Abstract: Method and apparatus for providing a controlled pressure liquid circulation system comprising a circulation conduit through which a liquid can be circulated and recirculated to accomplish a desired function, such as heating and/or cooling of a work station such as a mold. The invention involves opening and closing said circulation conduit to a source of supply liquid, such as city water, at elevated pressure while maintaining the controlled pressure of the liquid within said circulation conduit at a substantially lower pressure, and is characterized by maintaining the circulation conduit open to a drain line at all times and providing or maintaining a drain pressure which is at least slightly above atmospheric and is equal to the pressure desired within the circulation conduit in the area thereof which is open to the drain.

Abstract: The steam throttle valve has water injection ducts disposed about the valve axis. The ducts are situated between two abutting flanges of a valve cage and a valve spindle guide. The ducts are in the form of grooves in the flange while the adjacent peripheral surface of the flange is plain. The valve cage forms a replaceable wearing component and the configuration of the water injection ducts avoids thermal stress cracks in the duct zone.

Abstract: A demand regulator for use in breathing apparatus including a housing, a diaphragm in the housing separating the interior into a first chamber in communication with the ambient and a second chamber, a breathing passage for the user in communication with the second chamber, a valve controlling the supply of pressure to the second chamber and a valve actuator connected to the valve and operatively associated with the diaphragm for operating the valve in response to changes in the pressure differential between the first and second chambers. At least one heat conducting element is located in the second chamber and has a first portion located to receive heat from the user's breath and a second portion in heat transferring relation to the connection of the actuator to the valve whereby heat is transferred from the user's breath to the valve and connection to the valve actuator for preventing freeze-up of the valve and actuator under cold ambient conditions.

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: A shut-off valve for interrupting a flow of a fluid through a pipeline, particularly a flow of high temperature air in a gas main associated with a blast furnace, includes a valve body adapted to be connected to the pipes of the pipeline. The valve body has a pair of spaced walls having openings aligned with each other and with the pipes when the valve body is connected to the pipes. The valve body has therein a chamber. A valve plate is movably mounted within the valve body for movement between a closed position, whereat the valve plate extends between and interrupts communication between the openings, and an opened position, whereat the valve plate is positioned within the chamber and opens communication between said openings. A gaseous cooling fluid is introduced into the chamber. The valve plate has therein channels through which the gaseous cooling fluid passes when the valve plate is in the closed position, to thereby cool the valve plate.

Abstract: An electromagnetic valve assembly including a housing, a diaphragm member provided in the housing and defining first and second chambers therein, a first heat conducting plate member secured to the diaphragm member, a heat conductive output member secured to the first heat conductive plate member and extending outside of the housing, a heat conductive spring member one end of which is engaged with the heat conductive plate member, the spring member being positioned within the first chamber and normally biasing the diaphragm member in one direction, a solenoid coil positioned in the first chamber energized in repsonse to an electric signal, a contact operatively associated with the solenoid coil movable in response to energization of the solenoid coil, a first and second pressure source, a first valve member controlling fluid communication between the first chamber and the first pressure source in response to movement of the movable contact, a second valve member controlling fluid communication between the fir

Abstract: An improved winterizing system for a recreational vehicle or vacation home for the prevention of freezing and damage to the plumbing, the system providing for the sequential energizing of solenoid valves and the pump switch to effect the distribution of a non-toxic anti-freeze solution throughout the plumbing lines. A special cam switch assures the proper sequence of electrical switching.

Abstract: An anti-freeze apparatus for use with a recreational vehicle water system having a main water storage tank, a water pump, a hot water heater and domestic cold and hot water supply lines. The invention comprises an anti-freeze storage tank containing a supply of anti-freeze, a first valve mechanism in fluid communication with the anti-freeze storage tank and interposed between the water storage tank and the water pump and a second valve mechanism providing fluid communication between the water heater water inlet, the water heater hot water outlet and the domestic hot water line.

Abstract: Method and apparatus for mixing a carrier gas with a foundry aggregate resin catalyst fluid in which the liquid catalyst fluid is vaporized to a gaseous state and is thereafter mixed with the carrier gas. A proper proportion between the two gases is established by the setting of variable valves which control the flow of the two gases. The setting of the variable valve for the carrier gas establishes a flow rate for that gas at a given load level. The variable valve for the other gas is then set to establish a flow rate for the other gas with the desired proportion between the flow rates of said gases at said given load level. When the gas mixture is drawn upon at said given load level or at reduced load levels, the valves retain their initial relative settings and maintain the desired proportion, regardless of load level.

Abstract: A fluid flow control device includes a thermally conductive conduit section having both interior and exterior heat exchange surfaces, with the interior surface being adapted to contact fluid flowing thereover. A controllable heat transfer means coupled to the conduit section has a first operative state for removing heat from the exterior heat exchange surface to reduce the temperature of the conduit section sufficiently to freeze liquid adjacent the interior heat exchange surface and thereby at least partially restrict the flow of fluid thereover. In a second operative state, the heat transfer means supplies heat to the interior heat exchange surface to melt at least a portion of any frozen liquid adjacent the interior heat exchange surface and thereby permit the flow of fluid thereover.

Abstract: An apparatus for removing gas from a liquid such as sewage comprises a siphon having a rising leg 2 arranged coaxially within a falling leg 3. Depending into the siphon from a closure member 4 is a skirt 5. A gas extraction pump 6 is in communication with the siphon by means of a tube 7 which extends through closure member 4 at a location outside the skirt 5. Any foam drawn through with gas in the liquid when the pump 6 is operated will have to pass through liquid since the vacuum is drawn from the pump 6 at a location outside the skirt 5.

Abstract: A double-acting closure valve for use in a coaxial flow system consists of an inner pipe having an inner wall surface including surface portions which are profiled so as to provide a pair of inner valve seats spaced apart axially from one another, an inner body disposed coaxially within the inner pipe and having associated therewith a pair of inner valve closure members movable generally axially so as to abut the inner valve seats and an outer pipe coaxial with the inner pipe and having an inner wall surface including surface portions which are profiled so as to provide a pair of outer valve seats spaced apart axially from one another, an outer wall surface of the inner pipe also including surface portions each of which is profiled to enable one of a pair of outer valve closure members associated therewith to move generally axially so as to abut an outer valve seat.

Abstract: An internally piloted shut-off valve for use with cryogenic fluids incorporates a short valve housing with normally closed valve closure means incorporated therein and fluid passages with ports for fluid flow therethrough including an elongated extended stem protruding therefrom on top of which a solenoid operator is received in the stem end opening so as to define a cavity therein housing a large piston interconnected with the valve closure means by an internally piloted concentric tubing disposed coaxially with the stem and, in combination with large piston, comprising valve actuating means which permit the use of conventional solenoid operator and a trickle of cryogenic fluid converted to vapor inside pilot passage of the tubing and supplied to the cavity at atmospheric temperature when solenoid is enerized, creating pressure differential therein capable of maintaining valve open until the solenoid operator is de-energized, allowing valve closing automatically.

Abstract: A control valve assembly 10 for use in a system for heating water is disclosed. The system includes a source of steam 12, a steam condensate trap, a source of cold water, a heat exchanger 14 to transfer heat from the steam to the cold water, and an outlet where heated water is used. The control valve 10 assembly includes a dual valve structure which splits the flow of incoming cold water, directing one portion of it to the heat exchanger 14 and bypassing the other portion of the incoming cold water around the heat exchanger. The two portions of the incoming water rejoin in a blending chamber 16 which is connected with a water line to supply blended hot water to an outlet such as a shower or faucet. A controller 36 within the control valve assembly 10 is responsive to the demand for blended hot water.

Abstract: A venturi-type ejector for delivering cleaning liquid to an article to be cleaned and having cold and hot liquid inlets; a high pressure pump for delivering cold liquid to the cold liquid inlet; a boiler for heating liquid and having an outlet for connection to the hot liquid inlet; and a low pressure pump for delivering liquid to the boiler. A pair of motors are connected each to a different pump and are controlled to cause cold or hot fluids to be delivered to the ejector for ejection therefrom separately or together, selectively. Control elements are included for controlling operation of the boiler responsive to flow of liquid to the boiler and to temperature of fluid discharged from the boiler.

Abstract: This invention relates to an improved concrete pumping apparatus, in particular of the truck-mounted type and adapted to operate at low environmental temperatures.Said apparatus comprises means which define an essentially closed circuit for circulation of the cooling air of the auxiliary engine controlling the pumping group in heat exchange contact with apparatus components disposed in separate bays to be maintained within well defined temperature ranges above the temperature of the environment, and means for independently adjusting and maintaining the air temperature in each bay. The engine exhaust gases are used to preheat the casting tube.

Abstract: A ball valve for controlling the flow of hot fluids in nuclear reactor plants has a tubular body for a spherical valving element which is flanked by two axially movable seats and is turnable between open and closed positions. Discrete bellows are provided to move the seats away from the valving element before the latter is set in motion and to urge the seats against the valving element when the latter assumes and dwells in the newly selected position. The body and the valving element define a main cooling chamber which accommodates the seats and receives pressurized coolant. Such coolant flows into the fluid-conveying passage of the body by way of a clearance between cylindrical heat-insulating layers at both sides of the valving element and the periphery of the valving element. Additional cooling chambers which are provided between the bellows and the insulating layers communicate with the clearance via gaps between the seats and the respective insulating layers.