Abstract: A device for reducing evaporation of volatile organic compounds (VOC) during filling of a substantially liquid petroleum product into a storage and/or transportation tank (18) via a down pipe (14), wherein the down pipe (14), which has a non-constricted flow-section, is provided with an inlet (22) for gas at its upper portion, the inlet (22) being arranged to enable inflow of gas due to the underpressure being formed in the upper portion of the down pipe (14) when the petroleum product flows down through the down pipe (14).

Abstract: An arrangement for separating a fluid from admixtures has at least a first and a second separation unit. The separation units are of the type using an increased pressure or pressure difference for their function and have improved performance with increased pressure. The second separation unit is supplied with the fluid by a pressurising pump device. The first separation unit furnishes fluid of reduced concentration of admixtures to the pressurising pump device. It is supplied with supply fluid having reduced, the same, or elevated concentration of admixtures, preferably either taken directly from an outlet of the pump device or from an outlet of the second separation unit for fluid of increased concentration of admixtures. Overall, the concentration of admixtures in the fluid supplied to the second separation unit is decreased, leading to an increase in overall performance.

Abstract: With a method of establishing an enveloped flow in a channel, in the channel an envelopment area (3) with a channel section (6, 7) is configured to which a stub with an outlet is connected, where the stub, which can be configured as a polyhedron, is arranged substantially at right-angles to the envelopment area and with the plane of the outlet substantially at right-angles to the channel section. An inlet channel (9, 11) and an outlet channel (8, 10) are connected to the envelopment area. By providing a narrowing-down in the cross-section of the channel in immediate extension of the envelopment area (3), a hydrodynamic focussing of the sample fluid is achieved when a fluid, such as a sample fluid, is introduced into the stub, and a carrier fluid is introduced into the inlet channel. The advantage of the invention is that since it is necessary only to have two fluid inlets, a relatively simple structure can be established, which can be built up in a monolithic manner, e.g. by injection molding.

Abstract: An engine cooling system includes a centrifugal coolant pump and a cavitation suppressor in the system upstream of the pump inlet. The suppressor increases pressure in the pump inlet by a converging nozzle that accelerates a jet of coolant at the location of the static head and converting kinetic energy of the jet to increased pressure in a diffuser. In an exemplary embodiment, the suppressor is formed of simple components made from available materials and preferably welded into an assembly. A machined nozzle with a diffuser and head pipe made from available steel pipe comprise the main components of the exemplary cavitation suppressor.

Abstract: A delivery system and method for vaporizing and delivery of vaporized solid and liquid precursor materials at sub-atmospheric pressures between a heatable vaporization vessel and a processing tool. The system includes a pressure regulator internally positioned within the vaporization vessel and in fluid communication with a downstream mass flow controller to maintain a consistent flow of vaporized source material. The system further comprises introducing a carrier/diluent gas for diluting the vaporized source material before entry into the processing tool. A venturi is positioned directly upstream of the processing tool and provides for mixing of the carrier gas with the vaporized source material while providing the negative pressure required to open the gas pressure regulator within the vaporization vessel.

Abstract: An apparatus and method for drawing a sample of a chemical-mechanical polishing slurry for analysis of at least one property, e.g., particle size distribution, is described.

Abstract: A fluid mover (1) includes a passage (3) of substantially constant cross section into which supersonic steam is injected through an annular nozzle (16) as a transport fluid to contact a working fluid, e.g. a liquid, to be treated, the passage further including a mixing chamber (3A) downstream of the steam injection where the mixture is accelerated upon the creation of a low pressure zone occasioned by the condensation of the steam, a dispersed droplet regime and a shock wave being generated downstream of the nozzle (16). A pseudo-convergent/divergent section is created and provides a flexible boundary in the absence of physical constraints to yield an improved performance by combining shear dispersion and/or disassociation with the effects of the shock wave. The fluid mover (1) may be used in a wide variety of applications for pumping, heating, mixing, disintegrating, classifying and separating among others.

Abstract: An anti-backflow eductor has a resilient sealing sleeve disposed on a water port defining blind end tube. The sleeve has a thinner wall cross section at a discharge end to enhance sealing while facilitating increased water flow. The ports in the blind end tube extend into a radial tube flange at the tube's inlet end to facilitate water flow out of the ports between the sleeve and tube. A tapered seat in the housing, together with cross bars in the vents, reduces the air vent cross section and relative motion between sleeve and housing to reduce sleeve wear. The eductor comprises an anti-backflow housing and a venturi housing coupled together for relative rotation but being inseparable under normal conditions to inhibit venturi use without the anti-backflow function of the anti-backflow housing.

Abstract: The lifetime of a double-cone device (21) for creating a pressure difference in a streaming fluid can be greatly increased by moving the inlet gap (5) into the exit cone (4). This results in a short so-called diffuser (22) being obtained between the gap (5) and the orifice (19), where entry cone (3) and exit cone (4) are connected. The increased lifetime permits the double-cone device to cope with much higher flow rates. Thus higher system pressures are created which enhance the use of the double-cone for such applications as the desalination of sea water by reverse osmosis. The important application of the seperation of oil from water using a separating device such as a cyclone (57) working under elevated pressure is now feasible. The increased power of the double-cone permits one to profit more fully from the new concept of reduction of the concentration of the feed supplied to the double-cone device (21).

Abstract: With a method of establishing an enveloped flow in a channel, in the channel an envelopment area (3) with a channel section (6, 7) is configured to which a stub with an outlet is connected, where the stub, which can be configured as a polyhedron, is arranged substantially at right-angles to the envelopment area and with the plane of the outlet substantially at right-angles to the channel section. An inlet channel (9, 11) and an outlet channel (8, 10) are connected to the envelopment area. By providing a narrowing-down in the cross-section of the channel in immediate extension of the envelopment area (3), a hydrodynamic focussing of the sample fluid is achieved when a fluid, such as a sample fluid, is introduced into the stub, and a carrier fluid is introduced into the inlet channel. The advantage of the invention is that since it is necessary only to have two fluid inlets, a relatively simple structure can be established, which can be built up in a monolithic manner, e.g. by injection moulding.

Abstract: This backflow preventer includes a body having an upper portion providing an inlet and a lower portion providing an outlet. The body includes a backflow preventer having a nozzle communicating with the inlet, a passage communicating with the outlet and a diaphragm disposed between the nozzle and the passage. The diaphragm is maintained in the closed position by a resilient element and is movable under inlet water pressure from a closed position to an open position. The diaphragm is moved into the closed position by reverse back-up flow assisted by the resilient element and a relief gap is provided below the diaphragm to permit escape of reverse backflow.

Abstract: A differential injector for fluid mixing having a primary fluid inlet, a throat section and a diverging discharge outlet. A secondary fluid is pulled into the discharge outlet, through annular recessed grooves, by suction action produced by the primary fluid of the venturi. A plurality of channels feed the secondary fluid into the recessed annular grooves. The channels may be connected to a secondary fluid injection port via an injection annulus.

Abstract: An internal combustion engine, particularly suitable for use in a motor vehicle, is provided with a combustion air supply, an exhaust manifold, and a bypass venturi assembly. The bypass venturi assembly includes a housing having an outlet, a combustion air inlet connected and in communication with the combustion air supply, and an exhaust gas inlet connected and in communication with the exhaust manifold. A venturi nozzle is positioned in communication with the combustion air inlet. The venturi nozzle defines a bypass venturi section therein. The venturi nozzle and the housing define an exhaust gas venturi section therebetween terminating at an induction area. The venturi nozzle has a plurality of through holes in communication with a downstream portion of the exhaust gas venturi section. The exhaust gas inlet terminates at the induction area. A bypass valve is positioned to open and close the bypass venturi section.

Abstract: A fluid or detergent mixer comprises a body (2) in which is located a rotatable eductor tube (4) with a venturi throat (17) and a knob (3) to rotate the tube. The mixer has a suction line (5) to draw detergent from the bottom of a detergent container (6) and mix it with the water as it flows and finally through the eductor via a control valve (13) and air gap (14). The eductor tube may have two or more metering orifices (22) which are brought, selectively, into alignment with the detergent suction line (5). for convenience the fluid mixer is supplied to the end user with the detergent container already attached.

Abstract: A metering device for releasing water and detergent has a three-way connector, a water quantity adjustment device, a detergent quantity adjustment device, and a detergent bottle. The three-way connector has a three-way channel, a first end connected to the detergent quantity adjustment device, a second end connected to the water quantity adjustment device, and a third end connected to a water outlet hose. The water quantity adjustment device has a swivel ring and a water amount control ring engaging with the swivel ring. The detergent quantity adjustment device has a rotating ring and a detergent amount control ring engaging with the rotating ring. The detergent bottle engages with the detergent amount control ring.

Abstract: The present invention is a valve cleaning apparatus and method for transporting a cleaning fluid from a supply tank into the air intake valves of a combustion engine. It comprises housing having a pair of legs and a closed end. The housing has a flow path through the housing. A valve is located collinear with the flowpath. The valve cleaning apparatus also includes tubing, a nozzle and a hook to hang the assembly from the hood of a car.

Abstract: A system and method for the mixing and the application of liquids to various surfaces. The system includes a primary tank having a liquid fill fitting, a gas fitting, and an outlet. A pressurized gas source is in fluid communication with the primary tank by way of the gas fitting and a mixing device is in fluid communication with both the outlet and a concentrate reservoir. The mixing device is arranged and configured to mix the liquid and the concentrate into a liquid mixture. The system is configured such that the pressurized gas source expels the liquid through the outlet and the mixing device, thereby creating the liquid mixture.

Abstract: An apparatus for injecting a gaseous medium into a flowing liquid medium consisting of a first pipe having a closed end facing against the direction of the flowing liquid and an open end disposed in the direction of liquid flow, a second pipe coaxially disposed with the first pipe and having an open end extending through the closed end of the first pipe and a closed end inside the first pipe and a plurality of elongate apertures in its periphery adjacent the closed end and a substantially rectangular pipe entering the first pipe at an acute angle to introduce liquid into an annular gap between the first and second pipe in a substantially helical flow pattern traversing the elongate apertures thereby to draw air from the second pipe through the elongate apertures into the liquid.

Abstract: An apparatus for introducing a chemical into a fluid stream comprises a chemical injector adapted to be interposed within the path of the fluid stream flowing from an upstream conduit to a downstream conduit. The chemical injector includes primary and secondary channels, substantially parallel to the fluid flow through the upstream conduit, and a chemical feed channel having an input end, adapted to communicate with a chemical source, and an output end coupled at an angle to the secondary channel. Injection of a chemical into a fluid stream comprises directing the stream through an upstream conduit; dividing the stream into a primary flow and a substantially parallel secondary flow; coupling a chemical source at an angle to the secondary flow; increasing the fluid flow pressure until chemical flow into the secondary flow is induced by vacuum pressure; and directing the primary and secondary flows into the downstream conduit.

Abstract: An energy saving heat transfer unit providing an efficient means to transfer energy from steam to water in a central heating system. The steam enters a mixing chamber and creates a negative pressure environment. Water in a backwater pipe, which is at a lower temperature and pressure, is than is absorbed into the mixing chamber where energy is passed from the steam to the water. The heated water then exits the heat transfer unit and goes back into the heating system. After being cooled in the heating system, the water then reenters the heat transfer unit at the backwater pipe and continues the cycle over again.

Abstract: An apparatus for injecting a gaseous medium into a flowing liquid medium consisting of a first pipe having a closed end facing against the direction of the flowing liquid and an open end disposed in the direction of liquid flow, a second pipe coaxially disposed with the first pipe and having an open end extending through the closed end of the first pipe and a closed end inside the first pipe and a plurality of elongate apertures in its periphery adjacent the closed end and a substantially rectangular pipe entering the first pipe at an acute angle to introduce liquid into an annular gap between the first and second pipe in a substantially helical flow pattern traversing the elongate apertures thereby to draw air from the second pipe through the elongate apertures into the liquid.

Abstract: A connector for prohibiting a gas from flowing back is disclosed. The connector includes an outer housing having a gas inlet thereon; and an inner housing disposed inside the outer housing and having an annular concavity, corresponding to the gas inlet, thereon. The outer housing and the inner housing are funnel-shaped. The gas inlet is used for inputting an inert gas, and the annular concavity is used for dispersing the inputted inert gas.

Abstract: The EVRU is essentially an eductor, configured and designed, to capture and recover hydrocarbon fluids (gases and/or liquids) and/or other vapors and recombine and reinject into the system so that all the fluids are combined into a closed system to reduce or eliminate emissions (Greenhouse gases, VOC's, HAP's, CO, NOX and any other air pollutants). A measured, known volume of higher pressure fluid is fed into the eductor which draws measured, known volumes of lower pressure, hydrocarbon fluids and/or other vapors from emission (Greenhouse gas, VOC, HAP, CO, NOX and any other air pollutant) sources, combining the higher pressured fluids with the lower pressured fluids to an intermediate pressured combination fluid that is injected back into existing process equipment to close the system and prevent or minimize harmful emissions (greenhouse gases, VOC's, HAP's, CO and any other air pollutants).

Abstract: An energy saving heat transfer unit providing an efficient means to transfer energy from steam to water in a central heating system. The steam enters a mixing chamber and creates a negative pressure environment. Water in a backwater pipe, which is at a lower temperature and pressure, is than is absorbed into the mixing chamber where energy is passed from the steam to the water. A by-pass outlet is provided which relieves the heat transfer unit of excess pressure which may build up. The heated water then exits the heat transfer unit and goes back into the central heating system. After being cooled in the central heating system, the water then reenters the heat transfer unit at the backwater pipe and continues the cycle over again.

Abstract: An pressure washer enclosure capable of high pressure spraying with all pumps and chemicals enclosed for the protection of personnel and security of the chemicals. An external curbside control panel allows the operator to control the amount and concentration of the fluid emissions. A sealed plumbing arrangement minimizes chemical storage, handling and exposure. The enclosure has provisions for related cleaning equipment including a ladder rack accessible from the exterior of the housing.

Abstract: The EVRU is essentially an eductor, configured and designed, to capture and recover hydrocarbon fluids (gases and/or liquids) and/or other vapors and recombine and reinject into the system so that all the fluids are combined into a closed system to reduce or eliminate emissions (Greenhouse gases, VOC's, HAP's, CO, NOX and any other air pollutants). A measured, known volume of higher pressure fluid is fed into the eductor which draws measured, known volumes of lower pressure, hydrocarbon fluids and/or other vapors from emission (Greenhouse gas, VOC, HAP, CO, NOX and any other air pollutant) sources, combining the higher pressured fluids with the lower pressured fluids to an intermediate pressured combination fluid that is injected back into existing process equipment to close the system and prevent or minimize harmful emissions (greenhouse gases, VOC's, HAP's, CO and any other air pollutants).

Abstract: Disclosed is an improved mixing eductor (10) of the type wherein the primary liquid (17), e.g., water, is in a main stream (201) flowing in a downstream direction. A venturi tube (51) is in the eductor (10) and has an annular sharp edge (131) in the main stream (201), thereby dividing such stream (201) into a primary stream (179) and a secondary stream (181) around the primary stream (179). The eductor (10) has an air gap (103) and a flow guide (47) downstream thereof. In a specific embodiment, the flow guide (47) is annular around the venturi tube (51) and the tube (51) and the guide (47) are in spaced telescoped relationship. Several embodiments of the eductor (10) and a new method for mixing liquids are disclosed.

Abstract: A unitary, self-contained apparatus for generating microbubbles using a pipe section with a constriction device for producing a venturi effect to cause a mainstream liquid flowing under pressure in the pipe section to draw a column of additive fluid into the mainstream liquid from an aspiration tube for mixing with the liquid and a turbulence part of the pipe section immediately downstream from the constriction device. Protrusions from the inside surface of the turbulence part of the pipe section protrude to at least the theoretical interface between the column of additive fluid and the surrounding mainstream liquid and preferably beyond, where the theoretical interface is a circumference of the column of additive fluid having a radius equal to the radius of the inside surface of the aspiration tube.

Abstract: A method of providing venturi based vacuum valve (10) includes the step of providing a plug (12) formed with first (14), second (16) and third (18) openings. The first opening (14) formed in the plug (12) acts as an inlet and is smaller than the second opening (16). The first (14) and second (16) openings are connected within the plug (12) so that a small diameter space (20) is connected with a large diameter space (22) within the plug (12). A third opening (18), open to the atmosphere and forming a suction hole, intersects the small (20) and large (22) diameter space after the small diameter space (20) and before the second opening (16). The second opening (16) forms an outlet in the plug (12). The plug (12) in a preferred embodiment, is form fitted within a shower pipe (26) so that water is received first at the first opening (14). Thereafter, small diameter space (20) opens into large diameter space (22) and air through third opening (18) is mixed therein.

Abstract: An energy saving heat transfer unit providing an efficient means to transfer energy from steam to water in a central heating system. The steam enters a mixing chamber and creates a negative pressure environment. Water in a backwater pipe, which is at a lower temperature and pressure, is than is absorbed into the mixing chamber where energy is passed from the steam to the water. The heated water then exits the heat transfer unit and goes back into the heating system. After being cooled in the heating system, the water then reenters the heat transfer unit at the backwater pipe and continues the cycle over again.

Abstract: A unitary, self-contained apparatus for generating microbubbles using a pipe section with a constriction device for producing a venturi effect to cause a mainstream liquid flowing under pressure in the pipe section to draw a column of additive fluid into the mainstream liquid from an aspiration tube for mixing with the liquid and a turbulence part of the pipe section immediately downstream from the constriction device. Protrusions from the inside surface of the turbulence part of the pipe section protrude to at least the theoretical interface between the column of additive fluid and the surrounding mainstream liquid and preferably beyond, where the theoretical interface is a circumference of the column of additive fluid having a radius equal to the radius of the inside surface of the aspiration tube.

Abstract: A water flow controlled dispenser of liquid or water-soluble beneficial chemicals for sprinkling systems.

Abstract: A powder-conveying injector to move coating powder and wherein the jet catching duct(8) of the conveying jet nozzle (4) is made of glass.

Abstract: A self-adjusting venturi/mixer is disclosed. An inlet port body and outlet port body having a converging region and diverging region, respectively, are longitudinally slidably disposed with respect to each other, forming an annular injection gap that widens when the ports are moved apart and narrows when the ports are moved together. The movement is accomplished by virtue of varying fluid pressure at the inlet port, which exerts frictional pull on the outlet port, pulling the inlet port body away from the outlet port body. In other embodiments, a flexible member is positioned peripherially around the annular gap so that as the gap widens, the flexible member deforms to partially close the gap. This keeps the bubble size small where a gas is being injected into a liquid, and also limits a maximum flow of additive material at excessive flow rates.

Abstract: A venturi based vacuum valve (10) has a plug (12) with first (14), second (16) and third (18) openings. The first opening (14) formed in the plug (12) acts as an inlet and is smaller than the second opening (16). The first (14) and second (16) openings are connected within the plug (12) so that a small diameter space (20) is connected with a large diameter space (22) within the plug (12). A third opening (18), open to the atmosphere and forming a suction hole, intersects the small (20) and large (22) diameter space after the small diameter space (20) and before the second opening (16). The second opening (16) forms an outlet in the plug (12). The plug (12) in a preferred embodiment, is form fitted within a shower pipe (26) so that water is received first at the first opening (14). Thereafter, small diameter space (20) opens into large diameter space (22) and air through third opening (18) is mixed therein.

Abstract: A lubrication system for the intermittent lubrication of a lubrication target, comprises a lubrication emitter having structure for generating a series of lubrication liquid droplets and carrying the droplets along a travel path by a propellent gas stream issuing from the emitter, a lubrication target located in a spaced relationship from the emitter within the travel path and a moving barrier located proximate the emitter between the emitter and target and in a non-contact relationship with the emitter. The barrier generates an intermittent disturbance to the propellent gas stream whereby the carrying of the droplets by the propellent gas stream is prevented during the time interval of the disturbance. Carrying of the droplets by the propellent gas stream occurs during the time interval in which the disturbance ceases. The barrier can take the form of a disc or a shell surrounding the target.

Abstract: An aspirator for inflating inflatable devices such as aircraft emergency evacuation slides and life rafts using a quantity of primary gas that is stored in a tank that within the aspirator entrains a secondary gas, typically outside air, as the primary gas flows through the aspirator thereby producing sufficient gas to inflate a large inflatable structure or device as described above. The aspirator typically has injectors therein which act to promote the entrainment of large quantities of the secondary fluid using small quantities of the primary fluid thereby resulting in a large combined flow of gas forcibly flowing into the inflatable structure.

Abstract: An auxiliary exhaust system is provided for releasable attachment to internal combustion engines as are used on electrical generators of recreational vehicles or the like. The auxiliary exhaust system is easy to assemble and disassemble and directs combustion gases which have been cooled by ambient air upwardly to protect the RV occupants and near passersby. The auxiliary exhaust system provides a venturi effect with plastic stack sections which are slidably joined and which are light in weight. Shock cords stabilize the assembled auxiliary exhaust system and prevent noise transmittal from the generator and during adverse weather conditions such as high winds.

Abstract: A constant flowrate water saving valve comprises a main valve body having a peripheral wall formed with a conical-shaped valve seat surface, a liquid inlet opening on a side of the inner diameter r.sub.1, a vent flow opening on a side of the inner diameter r.sub.

Abstract: A valve assembly comprises a valve body, a valve plug and a pressure regulating conduit (phase regenerator). The valve body has an upstream opening, a downstream opening, and a hollow interior between the upstream and downstream openings. The hollow interior of the valve body is defined by an interior surface of the valve body. The valve plug is mounted within the hollow interior of the valve body. The valve plug is moveable relative to the valve body between a closed position and an open position. The valve plug is adapted for engagement with the valve body in a manner to prevent fluid flow through the valve body when the valve plug is in the closed position. The valve body is adapted to permit fluid flow in a downstream direction through the valve body, from the upstream opening to the downstream opening, when the valve plug is in the open position. The pressure regulating conduit is connected to the valve body and is adapted to introduce a gas into the hollow interior of the valve body.

Abstract: This invention relates to the area of jet technology, primarily to liquid/gas ejector devices used for the creation of a vacuum. The technical problem, solved by the invention, is the increase of the coefficient of efficiency of the liquid/gas vacuum ejector device. This problem has been solved by this invention due to the optimization of the process of mixing gas and liquid media. This has been achieved due to the optimization of mixing gas and liquid media in the mixing chamber of the liquid/gas vacuum ejector device, containing an active nozzle (1) and a mixing chamber (2), the area of the minimal section of the latter being 201 to 800 times the area of the minimal section of the active liquid nozzle (1), and the ratio of the distance from the outlet section of the mixing chamber (2) to the outlet section of the active nozzle (1) to the diameter of the minimal section of mixing chamber (2) is in the range from 10 to 300.

Abstract: The pre-compression nitrox in-line blender of the present invention has, at an upstream end, an oxygen diffuser for diffusing into an annular cavity of the diffuser oxygen supplied into an innermost cavity from a selectively adjustable pressure regulator regulating a high pressure oxygen reservoir. The annular cavity of the oxygen diffuser communicates, by an air intake aperture in the diffuser, with ambient atmospheric air, whereby a low relative air pressure within the annular cavity draws the ambient atmospheric air through the air intake into the annular cavity. A downstream end of the annular cavity is mounted or mountable to, so as to communicate in unimpeded gaseous communication with, an upstream end of an in-line turbulent mixer.

Abstract: A gas-air mixing valve using a tube. The valve has an internal geometry shape for directing the flow of air and gas, including an air inlet, an inlet part from the inlet to a throttle, a gas inlet slot proximate the throttle, and an outlet. The inlet part has a first body part, preferably of aluminum or other metal, and a replaceable molded part normally of plastic. The first body part has an inlet surface centered about a central axis defined by a concave surface having a first circular cross section. The replaceable molden part has a composite surface defined by conical surface defined by conical surface having a linear cross section and further defined by a convex surface having a second circular cross section forming the throttle. The replaceable molden outlet part has a conical surface extending from the second circular cross section to a second convex surface at the outlet.

Abstract: A non-mechanical leak proof coupling for use on a gas carrying pipe having two pipe sections which are moveable relative to each other. The coupling includes a first pipe section having an upstream end in flow communication with a stationary gas source and further includes a second pipe section having a downstream end in flow communication with a vibrating distribution chamber. A downstream end of the first pipe section and an upstream end of the second pipe section are disposed in closely spaced relation to define a gap therebetween. The first pipe section downstream end is in flow communication with the second pipe section upstream end such that the pressurized gas is communicated between the first pipe section to the second pipe section for discharge to the vibrating distribution chamber.

Abstract: Disclosed is an improved mixing eductor (10) of the type wherein the primary liquid (17), e.g., water, is in a main stream (201) flowing in a downstream direction. A venturi tube (51) is in the eductor (10) and has an annular sharp edge (131) in the main stream (201), thereby dividing such stream (201) into a primary stream (179) and a secondary stream (181) around the primary stream (179). The eductor (10) has an air gap (103) and a flow guide (47) downstream thereof. In a specific embodiment, the flow guide (47) is annular around the venturi tube (51) and the tube (51) and the guide (47) are in spaced telescoped relationship. Several embodiments of the eductor (10) and a new method for mixing liquids are disclosed.

Abstract: A venturi driven differential injector for fluid mixing having a constricting primary fluid inlet, a throat section and a diverging discharge outlet. A secondary fluid is pulled into the forward portion of the discharge outlet, through at least two annular recessed grooves, by suction action produced by the primary fluid of the venturi. A plurality of channels feed the secondary fluid into the recessed annular grooves. The venturi ports are connected to a secondary fluid injection port via an injection annulus.

Abstract: A three-piece air gap eductor includes a molded body having air gap, discharge and venturi sections, a nozzle and a spray shield extending about the venturi section entry to constrain turbulence and reduce backsplash and spray exiting the air gap chamber. A water stream engaging the outer-driven venturi is smoothly divided into respective venturi and bypass streams, with the frustoconical shield capturing turbulent water outside the venturi in a water sheet moving toward a discharge. An improved shield is frustoconically shaped, has an internal reflection shoulder and external moister collecting bars to enhance mist and spray reduction in the air gap section. A V-shaped recess in the shield facilitates its emplacement about the venturi section. The molded body is stiffened to avoid functional misalignment of the water stream between the nozzle and the venturi.

Abstract: A mixer-injector to improve the mixing and solution of treatment substances into a water stream. The mixer-injector has a constricting portion, a cylindrical injection portion, and an expanding portion in that order in the direction of flow, with an injector port entering the injection portion. The twisting vanes are formed on the wall of the constricting portion, and straightening vanes are formed on the wall of the expanding portion. The twisting vanes give a rotary component of motion to an outer portion of the water stream in the injection portion, and the straightening vanes remove at least some of it in the expanding portion, both to cause more pronounced vigorous movement of bubbles, and improved solution of the treatment substances.

Abstract: Apparatus for providing an admixture of first and second fluids has a first body having opposite ends, a chamber between such opposite ends, an inlet for first fluid into that chamber, and an aperture for the admixture at an end of that chamber. That apparatus also includes a second body having an inlet aperture for second fluid spaced from the first body, an outlet aperture spaced inside the chamber from the aperture for the admixture, and a fluid flow channel decreasing in cross-sectional area from the inlet aperture spaced from the first body to the outlet aperture inside the chamber between opposite ends of the first body. Such first and second bodies jointly comprise a flange structure at the first body and between the inlet and outlet apertures of the second body. An admixture flow channel increases in cross-sectional area away from the aperture at the end of the chamber.

Abstract: An eductor apparatus 20 includes a fluid inlet port 30 which directs fluid through an air gap 32 to an eductor 42. A rib 38 deflects any fluid which bounces off of the eductor 42 so that the fluid is retarded from exiting through an air gap port 34. The eductor 42 is of a one-piece construction having a specially designed inlet port 44 and exterior surface 116 thereabout in order to ensure attached flow and thereby reduce the amount of fluid which bounces off the exterior surface 116 and which is directed back upstream toward the air gap port 34.