Abstract: The invention relates to a fluid premixer for mixing a first fluid and a second fluid by aspirating the second fluid into the first fluid by Venturi effect. The premixer comprises a pipe which has a first inlet for the first fluid at a first pressure and a second inlet for the second fluid to be mixed into the first fluid to form a mixture. The pipe also has an outlet for the mixture at a second pressure and a shutter movable between several positions where each position defines a distinct degree of shutting of the pipe. The premixer also includes a control element to control the position of the shutter as a function of the difference between the first pressure and the second pressure.

Abstract: A two-stroke engine has a cylinder with a combustion chamber which is bounded by a piston which drives a crankshaft which rotates in a crankcase. The crankcase is connected to the combustion chamber via an overflow passage in the lower dead center region of the piston. The two stroke engine has an intake passage. A carburetor forms a section of the intake passage. The intake passage is partially divided into an air passage, which supplies combustion air into an overflow passage, and a mixture passage which opens into the crankcase. A throttle valve mounted pivotably in the carburetor controls the combustion air quantity supplied to the air and mixture passages. An air-guiding element arranged on the passage wall of the air passage guides the combustion air passing between the throttle valve and passage wall in the idling position of the throttle valve in the direction of the mixture passage.

Abstract: In one form, a carburetor may include an air passage, a fuel and air mixing passage, a throttle valve, an air valve and a lost motion coupler interconnecting the air valve and the throttle valve. The throttle valve may be disposed in communication with the fuel and air mixing passage and moveable between an idle position and an open position permitting an at least somewhat less restricted fluid flow therethrough than when the throttle valve is in the idle position. The air valve may be disposed in communication with the air passage, and moveable between closed and fully open positions to control air flow through the air passage.

Abstract: A carburetor has a carburetor housing in which an air passage and a mixture passage are disposed. A barrel valve controls the air passage and the mixture passage. The barrel valve has a mixture passage section and an air passage section formed therein. The air passage in at least one position of the barrel valve is closed off at least partially by the barrel valve. The air passage in the at least one position of the barrel valve in which the air passage is at least partially closed off by the barrel valve is connected by a connection within the barrel valve with the mixture passage. An internal combustion engine equipped with such a carburetor exhibits excellent running behavior.

Abstract: A carburettor includes a flow duct (4) including rich (8) and lean (10) passages in parallel, through which, in use, air flows and which are separated by a substantially planar partition (6). At least one fuel jet (12, 14, 16) communicates with the rich passage (8). The partition (6) includes a circular aperture (20). A butterfly valve (24) is mounted on a pivotal shaft (22) to be pivotable between a closed position, in which the flow duct (4) is substantially closed, and an open position, in which the flow duct is substantially open. The pivotal shaft (22) extends perpendicular to the plane of the partition (6). The pivotal shaft (22) carries a circular obturator disc (26), whose diameter is substantially equal to that of the aperture (20) and which is received in the aperture (20) and substantially closes the aperture (20) at all positions of the butterfly valve (24).

Abstract: The present invention is a quartz bubbler container with cross purge capability. This cross purge allows the user to easily purge air and chemical from the valve inlet and outlet by simply flowing inert gas, and avoids the requirement for a more complicated vacuum purging apparatus. The design incorporates two small footprint 3-way valves mounted on the bubbler container inlet and outlet connectors. The 3rd port of each valve is piped together between the valves with a crosspurge line. The valves are corrosion resistant, leak free, maintenance free, non-leaching of impurities, and can accommodate an optional breakseal crusher that will perforate quartz break seals (on the inlet and outlet of ampoule). Liquid out containers of various materials of construction are also contemplated.

Abstract: The carburetor (1) includes a flow duct including rich (60) and lean (50) flow passage in parallel, through which, in use, air flows in a flow direction and which are separated by a substantially planar partition (30), at least one fuel jet 5 communicating with the rich passage (60), the partition (30) including an aperture (40) towards which the fuel jet (5) is directed, and a substantially planar butterfly valve (20) being received in the aperture (40) so as to be pivotable between a first position, in which the flow duct is substantially closed and the aperture (40) is substantially open, and a second position, in which the flow duct is substantially open and the aperture (40) is substantially closed, the upstream half of the aperture (40) being defined by an upstream semi-annular seating ledge (48) affording an upstream seating surface which is engaged by one of the surfaces of the butterfly valve (20) when it is in the second position and a first end surface which extends between the upstream seating sur

Abstract: A valve is used with a carburetor, and the carburetor therefor. The valve has a throttle valve and an air valve. The air valve defines an air bore and has a baffle disposed within the air bore. The baffle separates one section of the air bore from another section, and impedes airflow through the air bore during at least some positions of the air valve.

Abstract: In a liquid substance supply device, a three port two valve directional control valve is provided in a transfer line, and a substance container and the transfer line are connected together by a four port three valve directional control valve in such a way that the four port three valve directional control valve and the substance container can be removed from the transfer line as a unit. Furthermore, in a vaporizer, an orifice member is provided to surround the end portion of an internal conduit in which flows a mixture substance consisting of a gas and a liquid substance mixed therewith, and gas for atomization is spouted into a vaporization chamber through a gap defined between the internal conduit and the orifice member. Yet further, the temperature of a vaporization surface in the vaporization chamber can be controlled independently in correspondence with the nature of the liquid substance.

Abstract: A carburetor having a carburetor body in which an intake channel portion is formed. At least one fuel opening opens out into the intake channel portion. Pivotably mounted in the intake channel portion is a butterfly valve that in a completely opened position divides the intake channel, in the region of the butterfly valve, into a mixture channel and a feed channel, so that in the completely opened position of the butterfly valve, flowing into the feed channel is combustion air having a fuel content that is less than the fuel content in the mixture channel. Provided in the intake channel portion is at least one partition section that extends between the feed channel and the mixture channel. The partition section is formed on the carburetor body.

Abstract: In a liquid substance supply device, a three port two valve directional control valve is provided in a transfer line, and a substance container and the transfer line are connected together by a four port three valve directional control valve in such a way that the four port three valve directional control valve and the substance container can be removed from the transfer line as a unit. Furthermore, in a vaporizer, an orifice member is provided to surround the end portion of an internal conduit in which flows a mixture substance consisting of a gas and a liquid substance mixed therewith, and gas for atomization is spouted into a vaporization chamber through a gap defined between the internal conduit and the orifice member. Yet further, the temperature of a vaporization surface in the vaporization chamber can be controlled independently in correspondence with the nature of the liquid substance.

Abstract: A carburetor having a carburetor body in which an intake channel portion is formed. At least one fuel opening opens out into the intake channel portion. Pivotably mounted in the intake channel portion is a butterfly valve that in a completely opened position divides the intake channel, in the region of the butterfly valve, into a mixture channel and a feed channel, so that in the completely opened position of the butterfly valve, flowing into the feed channel is combustion air having a fuel content that is less than the fuel content in the mixture channel. Provided in the intake channel portion is at least one partition section that extends between the feed channel and the mixture channel. The partition section is formed on the carburetor body.

Abstract: A carburettor for a two stroke engine includes a flow duct including rich and lean flow passages (160, 150) in parallel, through which, in use, air flows in a flow direction and which are separated by substantially planar partition (130). At least one fuel jet (5) communicates with the rich passage (160) and the partition includes an aperture (140) towards which the fuel jet is directed. A substantially planar butterfly valve (120) is received in the aperture so as to be pivotable between a first position, in which the flow duct is substantially closed and the aperture is substantially open, and a second position, in which the flow duct is substantially open and the aperture is substantially closed.

Abstract: A charge forming device includes a body with a fuel and air mixing passage, a bypass passage that communicates with the fuel and air mixing passage, a throttle valve and a choke valve. The throttle valve is movable between idle and wide open positions and operable to control at least in part the fluid flow through the fuel and air mixing passage. The choke valve is movable between an open position permitting a substantially free flow of air into the fuel and air mixing passage and a closed position at least substantially restricting air flow into the fuel and air mixing passage. A bypass valve is movable between an open position and a closed position to selectively permit fluid flow through the bypass passage. The bypass valve is movable toward its open position when the throttle valve is displaced at least a threshold amount away from its idle position.

Abstract: A carburettor is connected into the inlet duct (48) of an internal combustion engine. The inlet duct is divided by a dividing wall (64) into a rich passage (42) and a lean passage (44). The carburettor includes a fuel chamber (4) and defines a flow duct divided by a planar partition (66) into a rich duct (30) and a lean duct (32) which communicate with the rich and lean passages, respectively. The partition (66) defines an aperture (40) in which a planar butterfly valve (20) is pivotably mounted. A number of fuel supply orifices (61, 62) communicate with the fuel chamber (4) and with the duct (30) at a position opposite to the aperture (40).

Abstract: A carburetor including a mixture channel and an air channel that are separated from one another, wherein a fuel opening opens into the mixture channel. A throttle element is rotatable about an axis of rotation that extends transverse of the direction of flow in the mixture channel and in the air channel and extends through both channels. As a function of its position, the throttle element throttles a flow cross-section of the mixture channel and the air channel. The flow cross-section of a portion of the mixture channel and/or of the air channel has a non-circular shape in the vicinity of the throttle element.

Abstract: A carburetor including a frame having a first air/fuel channel and a second air channel; and a throttle valve assembly connected to the frame and having two valve sections. Each valve section is located in a respective one of the channels. A second one of the valve sections has an air bleed hole therethrough. The second valve section is movable relative to the frame from a first idle position to a second intermediate closed position and then to a third open position at a wide open throttle (WOT). The air bleed hole allows flow through the second channel at the first idle position, but does not allow flow through the second channel when the second valve section is at the second intermediate closed position.

Abstract: A carburetor (18) has a carburetor housing (17) wherein an intake channel (19) is guided having a flow cross section of less than 3 cm2. The carburetor (18) includes a partition wall (11) which partitions the intake channel (19) into a mixture channel (21) and an air channel (8). The partition wall (11) runs in the longitudinal direction of the intake channel (19). The carburetor (18) has a throttle flap (24, 64) pivotally journalled on a throttle shaft (25, 45, 55, 65, 75). A venturi (23) is formed upstream of the throttle shaft (25, 45, 55, 65, 75) in the mixture channel (21). A fuel opening (28) opens into the mixture channel (21) at the venturi (23). A device for dethrottling the mixture channel (21) and/or for dethrottling the air channel (8) is provided in order to compensate or equalize the nonuniform throttling of the air channel (8) and the mixture channel (21) by the throttle flap (24, 64).

Abstract: A carburetor including a frame having a first air/fuel channel and a second air channel; and a throttle valve assembly connected to the frame and having two valve sections. Each valve section is located in a respective one of the channels. A second one of the valve sections has an air bleed hole therethrough. The second valve section is movable relative to the frame from a first idle position to a second intermediate closed position and then to a third open position at a wide open throttle (WOT). The air bleed hole allows flow through the second channel at the first idle position, but does not allow flow through the second channel when the second valve section is at the second intermediate closed position.

Abstract: A carburetor arrangement for a two-stroke engine (1) is for a portable handheld work apparatus such as a motor-driven chain saw, cutoff machine or the like and has an intake channel (22). The intake channel (22) is partitioned by a partition wall (11) into an air channel (8) and a mixture channel (21). A fuel opening (27, 28) for supplying fuel to the two-stroke engine (1) opens into the mixture channel (21). The carburetor arrangement has a carburetor (17) having a carburetor housing (18) wherein an intake channel section (32) is formed. A throttle flap (24) is pivotally journalled in the carburetor housing (18). A good partitioning of the air channel (8) from the mixture channel (21) results with a simple manufacture of the carburetor (17) when a partition wall section (31, 48, 58, 68, 78, 88, 98) is configured as a separate component upstream of the throttle flap (24) and is held in the intake channel (22).

Abstract: An intake device having an intake channel that includes an intake channel section is provided. A butterfly valve is pivotably mounted in the intake channel section. A dividing wall is disposed downstream of the butterfly valve and divides the intake channel section into an air duct and a mixture duct. The air duct has a flow cross-section that is greater than the flow cross-section of the mixture duct. A fuel jet opens into the mixture duct.

Abstract: Flange assembly for supporting a structure that provides scavenging air supply to an internal combustion engine at the carburetor to the engine. The assembly includes a thin-body flange that is configured to be abuttingly installed upon an end surface of the carburetor. The carburetor has its combustion air intake or port exposed at an outer surface for intaking air for the combustion process. The thin construction of the flange enables advantageous positioning of the adaptive flange. The relative dimensioning of the thin-body flange also contributes to its low-impact as a modification to air inlet arrangement. A combustion air aperture is provided that extends through the thin-body flange. The combustion air aperture is located in the flange for alignment with the combustion air intake. By this alignment, fluid communication is established across the flange and into the carburetor when the flange is abuttingly installed upon the carburetor.

Abstract: A carburetor including a frame having a first air/fuel channel and a second air channel; and a throttle valve assembly connected to the frame and having two valve sections. Each valve section is located in a respective one of the channels. A second one of the valve sections has an air bleed hole therethrough. The second valve section is movable relative to the frame from a first idle position to a second intermediate closed position and then to a third open position at a wide open throttle (WOT). The air bleed hole allows flow through the second channel at the first idle position, but does not allow flow through the second channel when the second valve section is at the second intermediate closed position.

Abstract: A diaphragm carburetor is provided for an internal combustion engine that operates with scavenging air, especially a two-cycle engine in a manually-guided implement. The carburetor has an intake channel portion in which is disposed a butterfly valve that is rotatably held via a shaft and in the vicinity of which fuel-supplying channels open into the intake channel portion. The channels are supplied from a fuel-filled regulating chamber that is formed on a longitudinal side of the intake channel portion in the carburetor housing and is separated by a regulating diaphragm from a compensation chamber. The carburetor has at least one air channel that supplies additional combustion air and that has an air valve that is rotatably held via a shaft.

Abstract: A carburetor for a two stroke engine with an air passage and a separate fuel and air mixing passage in a carburetor body and the passages having an air valve and a throttle valve, respectively. A coupling connects a valve shaft of the air valve with a valve shaft of the throttle valve and has an area wherein the valves are rotatable relative to each other corresponding to a difference between an opening and closing angle of the air valve and an opening and closing angle of the throttle valve. Preferably, when the throttle valve is in an idle position, the air valve is closed and the throttle valve can be opened through at least some angle from its idle position before the air valve is moved from its closed position. Also, the air valve is preferably fully opened when the throttle valve is moved to its fully or wide open position.

Abstract: A carburetor for providing a fuel and air mixture and a scavenging air supply to a two stroke internal combustion engine has a throttle valve received in a fuel and air mixing passage and connected to a throttle drive for controlling engine operation and an air valve received in an air passage and selectively operably connected to the throttle valve by a lost motion coupling. Preferably, the throttle valve and the air valve are barrel-type valves each comprising an opening formed through a shaft extending transversely through and rotatable within an associated bore of the carburetor body.

Abstract: A carburetor for a stratified type scavenging engine has a scavenging air supply passage with an air valve therein, a fuel and air mixture passage having a throttle valve therein, a diaphragm which defines a negative pressure chamber on one side and an atmospheric chamber on its other side, and a low pressure passage that communicates a venturi portion of the fuel and air mixing passage with the negative pressure chamber. The air valve is responsive to movement of the diaphragm caused by the pressure differential across it to move the air valve between open and closed positions and a spring yieldably biases the air valve towards its closed position. The air valve is not directly mechanically connected or linked to the throttle valve. Thus, when the throttle valve is rapidly opened during engine acceleration, the air valve is not immediately rapidly opened and is not significantly opened until a sufficient pressure differential exists across the diaphragm.

Abstract: To provide a lightweight choke valve that has a reduced number of components and is easy to assemble, despite being provided with a relief valve. A carburetor choke valve provided in an intake passageway of a carburetor includes a plate shaped choke valve body having a relief opening. A base end side of a plate shaped relief valve for opening and closing the relief opening is jointly fastened to a rotatably supported choke shaft crossing the intake passage of the carburetor.

Abstract: A primary passage and a secondary passage in a parallel relation to each other are disposed between an air cleaner and a branch passage collecting portion of an intake manifold. The primary passage is smaller in diameter than the secondary passage and has at the downstream end thereof a laval nozzle through which air flows at the speed of sound even under low-speed low-load engine operating conditions. The laval nozzle is connected to a carburetion chamber which is elongated straightly in the direction downstream of the laval nozzle. A fuel injection valve is disposed in the primary passage at a place upstream of the laval nozzle. A pressure control valve is adapted so that a vacuum higher than a predetermined value is developed in the carburetion chamber at any time. A primary throttle valve and a secondary throttle valve are interconnected so that the secondary throttle valve is held closed unless the primary throttle valve is fully open.

Abstract: A vaporizer includes means 11 which may be an electronically controlled solenoid valve to divert repeatedly a carrier gas into either a first path which goes directly from the inlet 3 to the outlet 5 of the vaporizer or a second path which enters a vaporizing chamber 13 to entrain volatile liquid vapor before re-joining the first path.

Abstract: A generator for converting volatile combustible liquids, such as gasoline, methanol and the like, into an aeriform gas including a closed vessel containing liquid gasoline maintained at a predetermined level, evaporating the liquid gasoline by passing streams of desiccated atmospheric air therethrough, after which the resulting gas is passed through specially processed charcoal material, which stabilizes the resulting gas into an aeriform gas as a fuel source for internal combustion engines.

Abstract: A method for increasing the hydrogen sulfide concentration in a gas stream, particularly a stream to be fed to a Claus unit, is disclosed. The method is characterized by the measurement of the flow of the gas stream to an absorption system, and in response to such measurement, separation of a portion of the acid gas leaving the regenerator of the system, and selective absorption of the H.sub.2 S in the portion, with passage of the loaded absorbent to the regenerator.

Abstract: A staged carburetor comprises a carburetor body having an inner induction passage with a venturi therewithin and an outer induction passage encircling the inner induction passage. A fuel circuit has an outlet at the venturi. A fuel metering rod extends transversely of the induction passages and has a variable diameter end portion projecting into the outlet. The metering rod moves relative to the outlet to vary the quantity of fuel delivered and has an enlarged diameter section intermediate its length which further reduces the cross-sectional area of the inner induction passage at the venturi and increases the pressure drop created thereat. An air valve positioned in the outer induction passage normally closes the passage whereby air is initially drawn into the engine only through the inner induction passage. Increased demand for air results in an opening force being exerted on the air valve to open it so air is drawn into the engine through both induction passages.

Abstract: An air-fuel ratio control system for an internal combustion engine utilizes an oxygen sensor to maintain a 14.5/1 air-fuel ratio at a first location in an intake manifold to an engine combustion chamber. A method and apparatus is disclosed for adding fuel and/or air to the air-fuel mixture at a second location, between the first location and the engine combustion chamber, so that the engine operates at a high economy, low emission point when idling, running at a substantially constant speed or decelerating and operates at a low economy point, yet still with low emissions, only when accelerating.

Abstract: In a carburetor as for a vehicle engine, the carburetor having a throttle body with an induction passage therethrough defined in part by a two-dimensional variable rectangular nozzle having a pair of plane parallel opposite walls and a pair of convergent-divergent contoured walls, one of the contoured walls being mounted to an upstream pivot shaft and actuated by an accelerator pedal operatively connected thereto for pivotal movement relative to the other contoured wall and, a fuel injector means pivotably supported by the pivot shaft and having its fuel discharge means positioned to discharge fuel into the induction passage upstream of the throat of the nozzle, the fuel injector means being operatively linked by a fuel injector positioner linkage to the movable contoured wall so that its angular movement is one-half the angular movement of the movable contoured wall.

Abstract: An air-fuel ratio control system for an internal combustion engine includes an air intake connected to a burning chamber having an oxygen sensor and an intake manifold to an engine combustion chamber. Fuel is mixed with air in both the air intake and the intake manifold. The oxygen sensor maintains a 14.5/1 air-fuel ratio in the mixture in the air intake, and a pressure differential sensor equalizes the pressures in the air intake and the intake manifold. The rate of flow of fuel into the intake manifold is varied so that the engine operates at a high economy, low emission point when idling, running at a substantially constant speed or decelerating and operates at a low economy point, yet still with low emissions, only when accelerating.

Abstract: A sonic flow-type carburetor having a variable area venturi defined by a conical air nozzle receiving axially within a movable matching conically-shaped plug to define a constricted annular variable area or zone between through which air flows at sonic velocity over a large portion of the operating range of the engine, the plug shape defining a diffuserless nozzle to locate the point of maximum flow velocity at the manifold edge of the plug for better atomization of the fuel and uniform distribution into the air stream for flow into the manifold, the plug having an annular fuel induction port opening into the zone and connected by conduit means to an induction-type fuel supply slot by an overlapping christmas tree-shaped slot, air also being variably supplied to the conduit means as a function of engine operation to vary the fuel induction signal and, therefore, the overall air/fuel ratio of the mixture flow to the engine.