Abstract: Systems and methods for conditioning sewage having entrained solids which clog sewage pumps, are disclosed. Systems include a sewage pump, a chopper pump, and a mixing nozzle connected to the chopper pump. Specifically, the sewage pump is a non-clog centrifugal pump having an inlet for drawing fluid into the pump and an outlet for discharging the fluid into a pipe, while the chopper pump has an inlet for drawing fluid into the pump and an outlet for discharging the fluid into the wet-well. The chopper pump may be positioned either in or adjacent to the wet-well. The mixing nozzle fluidly coupled to the chopper pump discharge, is positioned in the wet-well. Methods include the steps of positioning a chopper pump within the wet-well, drawing in liquid sewage, including the entrained solids, reducing the size of entrained solids, and discharging the sewage and reduced size solids into the wet-well.

Abstract: The invention concerns a purge/sampling system for vessels, particularly for high temperature, high pressure vessels such as hydroconversion reactors used in refinery processes and operated in severe conditions. Such purge/sampling system comprises a purge/sampling line (16) equipped with a connector designed to be connected to the vessel (10), a first (18 and a second (20) flow regulation systems mounted in series on the purge/sampling line, wherein at least one injection line (22) is connected to the purge/sampling line between the first and the second flow regulation systems, said injection line comprising connecting means to a source of cleaning fluid (24) and at least one flow regulation device to control the flow of cleaning fluid through injection line and purge/sampling line The invention also concerns a vessel equipped with such a purge/sampling system, as well as a cleaning method using said purge/sampling system.

Abstract: The invention relates to a light-weight device for loading solid particles into an enclosure including at least one pipe (18, 20) for the circulation of said solid particles and at least one movable element for controlling the fall velocity of the particles, which is designed to be slidably moved inside of said pipe (18, 20). The device further includes a plurality of identical guide plates (12a, 12b) connected to each other by attachment means. Said at least one pipe (18, 20) is made of a flexible material and each guide plate (12a, 12b) has at least one through opening for receiving and guiding said at least one pipe (18, 20) in a position in which the longitudinal axis of the pipe extends substantially perpendicular to the plane of each guide plate.

Abstract: A device is provided for delivering fluids to, or removing fluids from, one or more fluid streams, the device having a body having a plurality of channels extending through the body from a first to a second end of the body, the body having one or more internal passages therein extending in a direction crossways to the plurality of channels. Each channel is in fluid communication with one or more of the passages via a porous wall between the respective channel and an associated passage. The one or more passages are in fluid communication with the exterior of the body.

Abstract: The fuel flow rate to a gas turbine is measured using an inert gas. The inert gas is injected into the fuel flow and the concentration of the inert gas in the fuel/inert gas mixture is later measured. The concentration of the inert gas in the fuel/inert gas mixture is then used to calculate the mass flow rate of the fuel.

Abstract: A microfluid ejection system includes a fluid path having proximate and distal ends, the proximate end having an inlet to receive fluid from a fluid supply, a vacuum chamber for suctioning of air from both the proximate and distal ends of the fluid path, and a pre-ejection chamber disposed in the fluid path between a proximate end and a distal end. The pre-ejection chamber includes a ceiling inclined upward toward each of the proximate and distal ends from a low point to direct air toward either the proximate or distal end for suctioning from the pre-ejection chamber. The microfluid system further includes a first and second air chambers disposed respectively at the proximate and distal ends of the fluid path to receive and direct air to the vacuum chamber.

Abstract: A method for mixing, transporting, storing, and transferring a thixotropic fluid is disclosed. The method includes mixing a thixotropic fluid. The thixotropic fluid may be built within a fluid container that includes an agitation unit. Once it has gelled, the thixotropic fluid can be sheared using the agitation unit, which may be mounted within the fluid container. The thixotropic fluid can then be pumped out of the fluid container.

Abstract: A device includes a filling valve, a sleeve, an absorbing member, and a gas control unit. The filling valve can be engaged for filling liquid gas. The sleeve includes a fluid passing section that enables liquid gas outside to flow therein. The absorbing member can absorb liquid gas and is disposed in the sleeve. The gas control unit includes a main body, a gas inlet and flow rate adjusting mechanism, and a gas outlet mechanism. The gas inlet and flow rate adjusting mechanism includes an adjustably movable valve and a first air seal. The first air seal is mounted between the adjustably movable valve and the main body to prevent liquid gas from passing therebetween. The adjustably movable valve is in fluid communication with the gas outlet mechanism such that vaporized gas emitted from the absorbing member is discharged from the device from the gas outlet mechanism.

Abstract: An electrical module for use within a fuel injector for delivering fuel to an internal combustion engine is described. The electrical module has a variable length. The electrical module comprises electrical contacts for operatively connecting the electrical module to a power plug of a fuel injector. The electrical module also comprises an actuator for operatively controlling a control valve disposed within the fuel injector. The electrical module also comprises electrical conductors arranged within a protective housing. These electrical conductors provide an electrical connection between the electrical contacts and the actuator in order to provide electrical power to the actuator when the electrical contacts are operatively connected to the power plug of the fuel injector. The body of the electrical module is comprised of a compressible elastic element, such that the length of the module is variable by compressing the elastic element. Injectors including such electrical modules are also described.

Abstract: A valve device includes a wire channel through which wires are routed from the inside of a gas tank to the outside of the gas tank, and a hermetic connector in which a sealing member is provided around wire pins that constitute part of the wires is provided in the wire channel. In addition, the wire channel has multiple (two) bent portions formed on the outer side of the hermetic connector. When pulling force acts on the wires from the outside, stress concentration portions are formed in the wires at these bent portions.

Abstract: Embodiments disclosed herein generally relate to an HVPE chamber. The chamber may have two separate precursor sources coupled thereto to permit two separate layers to be deposited. For example, a gallium source and a separate aluminum source may be coupled to the processing chamber to permit gallium nitride and aluminum nitride to be separately deposited onto a substrate in the same processing chamber. The nitrogen may be introduced to the processing chamber at a separate location from the gallium and the aluminum and at a lower temperature. The different temperatures causes the gases to mix together, react and deposit on the substrate with little or no deposition on the chamber walls.

Abstract: Pressure maskers for masking at least one passageway of an article include a body portion that surrounds at least a portion of the article around the at least one passageway, at least one fluid inlet connected to the body portion that provides a conduit for pressurized masking fluid to pass from an exterior of the pressure masker to an interior of the pressure masker, wherein the article is at least partially disposed within the interior of the pressure masker, and at least one seal that seals the body portion at least partially around the article such that the pressurized masking fluid that enters the interior of the pressure masker is at least partially forced through the at least one passageway.

Abstract: The faucet device (1) of the present invention includes a device body (2); a solenoid valve (12); a spout port forming portion (44); a generator (14) for generating electrical power by rotating an impeller; a solenoid valve-side water-passage forming member (52) for guiding water to the generator; a spout port-side water-passage forming member (42) for guiding water to a spout port; a first elastic member (52a) for sealing between the solenoid valve-side water-passage forming member and the generator and allowing relative displacement therebetween; a second elastic member (42b) for sealing between the spout port-side water-passage forming member and the generator and allowing relative displacement therebetween; a third elastic member (60) for coupling the solenoid valve-side water-passage forming member and the device body and allowing relative displacement therebetween; and a fourth elastic member (58) for coupling the spout port-side water-passage forming member and the device body and allowing relative dis

Abstract: A foam dispensing apparatus for dispersing foamed material into an excavation containing pipelines and a novel power head for dispersion of foam.

Abstract: An assembly for adjusting gas flow patterns and gas-plasma interactions including a toroidal plasma chamber. The toroidal plasma chamber has an injection member, an output member, a first side member and a second side member that are all connected. The first side member has a first inner cross-sectional area in at least a portion of the first side member and a second inner cross-sectional area in at least another portion of the first side member, where the first inner cross-sectional area and the second inner-cross-sectional area being different. The second side member has a third inner cross-sectional area in at least a portion of the second side member and a fourth inner cross-sectional area in at least another portion of the second side member, where the third inner cross-sectional area and the fourth inner-cross-sectional area being different.

Abstract: The present invention provides a bistable pulse solenoid valve control system and method. The control system includes a bistable pulse solenoid valve having a coil current, and including a coil frame, a coil having a magnetic flux, at least two permanent magnets, a valve core disposed inside the coil frame, and a frame configured to encapsulate the permanent magnets, the coil, the valve core, and the coil frame. The system also includes a main control circuit, a polarity conversion control circuit, and a drive current sampling detection circuit. The main control circuit is configured to generate a control signal and the polarity conversion control circuit is configured to control the direction and power on-off time of the coil current.

Abstract: An apparatus of a gas extractor for exhaust gas monitoring includes an extractor tube, an intake opening, a vent opening, and a plurality of sensors. The extractor tube is connected to an exhaust duct, where the exhaust duct provides an emitting gas flow. The plurality of sensors is attached to the extractor tube. A representative sample of the emitting gas flow travels through the intake opening into the extractor tube, where the intake opening is an intake angular extremity of the extractor tube. The plurality of sensors is able to take readings from the representative sample once the representative sample is within the extractor tube. Then the representative sample exits from the extractor tube through the vent opening, where the vent opening is a vent angular extremity of the extractor tube.

Abstract: A hydraulic circuit for a vehicle powertrain includes a first line for carrying fluid to a torque converter, a second line for carrying fluid from the torque converter, a third line for carrying fluid to a balance dam and an electric motor, and a fourth line for supplying actuating pressure to a clutch, said lines being coaxial.

Abstract: A modular control device (1) is proposed, containing a support module arrangement (3) equipped with a control module arrangement (15). Additionally provided information-carrying modules (42) make it possible to make information regarding the control modules (16) available. They respectively contain a fastening section (43) fixed in place on the support module arrangement (3) and an information-carrying section (45), which is pivotably seated on hinge means (44). The information-carrying section is embodied in an L-shape and can be selectively positioned in a working position, in which it extends over the control module arrangement (15), or in a release position, in which it makes the control module arrangement (15) accessible.

Abstract: A visual display panel (1) comprising: a front face (3); an array of optical display elements, a plurality of fluid flow conduits, each conduit extending through the panel from an aperture on the front face; and a manifold (32) in fluid communication with one or more of the plurality of fluid flow conduits, the manifold having one or more manifold inlets (38) fluidly coupled to a fluid pump (33) for displacing fluid through the conduits.

Abstract: Conventional pressure sensor units require time-consuming work including bonding and welding in assembly work and affixing a pressure sensor to a holder, and therefore a pressure sensor unit in which a pressure sensor can be easily affixed to a holder is needed. Disclosed is a pressure sensor unit wherein a holder comprises a first holder member and a second holder member, and by fitting a fitting groove of the first holder member and a fitting claw of the second holder member with each other while housing a pressure sensor in housing holes provided in the two holder members, the two holder members are affixed, and the pressure sensor is affixed to the holder.

Abstract: A gas meter with integrated gas shut-off valve has a housing with a gas inlet and a gas outlet. A device to record the gas flow, a meter mechanism, a gas shut-off valve and optionally a pressure reducer are positioned in a gas flow path between the gas inlet and the gas outlet. The gas shut-off valve is an electrically operated valve with a spherical or cylindrical valve element.

Abstract: The lifetime of aerosol monitoring, concentration and collection equipment is extended by acoustic cleaning of accreted particle deposits from internal surfaces where fouling occurs by application of acoustic energy to the particle accretion surface, optionally in combination with a liquid wash or sampling volume. In one application, acoustic cleaning or sampling of particle deposits for analysis is triggered by a signal indicating changes in gas flow associated with particle loading. In another application, electro-acoustic transducers may be used to prevent particle buildup without interruption of particle monitoring.

Abstract: A plurality of valve assemblies having a plurality of manifold valves assembled are electrically coupled in a row via lead wire assemblies to transmit a power signal for driving solenoids of the manifold valves in parallel from the valve assembly at a proximal side of the row to the valve assembly at a leading end side via the manifold valves of the valve assemblies and the lead wire assemblies.

Abstract: An apparatus for inhibiting the formation of tropical cyclones, comprising an elongated rigid tube through which cooler water is pumped from below to the near-ocean surface, thereby depriving incipient tropical cyclones of the heat energy they require for further development. The tube contains a pump comprising a fixed flap valve and a movable flap valve. The movable flap valve is attached to a drive disk encircling the tube at a depth where ambient waters have little vertical motion. The wave-driven vertical motion of the elongated tube causes the movable flap valve to oscillate with respect to the fixed flap valve, thereby pumping seawater upward onto the near-ocean surface. The apparatus also can navigate to alternative locations by means of a propulsion/steering system, and it can submerge to a safe depth to avoid oncoming vessels and potentially damaging seas. A fleet of apparatuses is required to provide the necessary cooling effect.

Abstract: A liquid cartridge includes a liquid reservoir, a liquid flow path that selectively places the reservoir in fluid communication with an exterior of the cartridge, a sensor that outputs a signal relative to a position of an object in the liquid flow path, a storage that stores data therein, and a plurality of terminals. The plurality of terminals includes a sensor terminal connected to the sensor, a power terminal connected to at least one of the sensor and the storage, and that receives power, and a data terminal connected to the storage. A distance between a first portion of the power terminal and at least a portion of the data terminal is greater than a distance between a second portion of the power terminal and at least a portion of the sensor terminal.

Abstract: The invention relates to a flow controller for fluids, having an energy supply by means of the flow of said fluid. Said flow controller consists of a supply line for the fluid and a turbine wheel which is rotationally mounted and through which the fluid flows and which drives an electric generator which charges the energy accumulator and a consumption point for the fluid. The forwarding of the liquid can be blocked by a shut-off valve which can be electrically controlled by control electronics which use at least one sensor and which can be adapted to various types of sensors and to the characteristics of the various types of consumption points and the shut-off valve, the control electronics and the sensor can be supplied with electric energy by the energy accumulator.

Abstract: A retractable hose vacuum cleaning system comprising a retractable vacuum hose configured to retract through a dual port valve assembly, into a system vacuum tube responsive to the vacuum communicated from a vacuum source. The dual port valve assembly comprising one port adapted to receive the full length of a retractable vacuum hose into a system vacuum tube for storage, a second port adapted to connect to the hose end fitting and supply electrical grounding, electrical power and vacuum to the hose for use, valve seals to stop air flow through the port that is not in use and a third port to connect the valve to the system vacuum source. The dual port valve assembly also comprises a debris trap.

Abstract: A beverage preparation machine (1) has: a housing (5); a duct (10) with an outlet (15); a conduit (20) upstream the duct and connected thereto; and a waste liquid collector (30) arranged to collect waste liquid from the outlet. The duct has: an operative position for circulating beverage through the conduit and dispensing said beverage from the outlet outside the housing above a user-receptacle filling area (35); and a cleaning position for circulating cleaning fluid through the conduit and evacuating said cleaning fluid from the outlet inside the housing to the waste liquid collector. The duct is pivotally assembled about a pivoting axis (11) to the conduit for pivoting the outlet between the operative position and the cleaning position.

Abstract: Provided is an exhaust gas purifying device which can improve handling work ability such as maintenance of an engine while it can improve a purifying performance of an exhaust gas of the engine. The exhaust gas purifying device is provided with a plurality of gas purifying bodies which purifies the exhaust gas discharged by the engine, a plurality of inside cases which are inward provided with the gas purifying bodies, and outside which are inward provided with the inside cases. An outlet end portion of an inside case in an exhaust gas upstream side and an inlet end portion of an in an exhaust gas downstream side are superposed as a double structure. Sensor boss bodiest'or supporting exhaust gas sensors are arranged in an outside surface of the outlet end portion or the inlet end portion of the double structure. The sensor boss bodiesare extended to an outside direction of the outside case.

Abstract: A vortex-controlled variable flow resistance device ideal for use in a backpressure tool for advancing drill string in extended reach downhole operations, especially in horizontal wells. The shape, frequency and duration of the pressure waves generated by the device are controlled by the growth and decay of vortices in the vortex chamber(s) of a flow path. The flow path includes a switch, such as a bi-stable fluidic switch, for reversing the direction of the flow in the vortex chamber. The flow path may include multiple vortex chambers, and the device may include multiple flow paths, through which flow may be parallel or sequential. This device generates backpressures of short duration and slower frequencies approaching the resonant frequency of the drill string, which maximizes axial motion in the drill sting and weight on the bit. Additionally, fluid pulses produced by the tool enhance debris removal ahead of the bit.

Abstract: The present disclosure relates to a diesel exhaust treatment device including a catalytic converter positioned upstream from a diesel particulate filter. An electric heater is positioned between the catalytic converter and the diesel particulate filter. A shore station can be used to provide power and combustion air to the diesel exhaust treatment device during regeneration of the diesel particulate filter.

Abstract: A system for providing pneumatic power to a vitrector includes first and second output ports, an output valve, an isolation valve, and three manifolds. The first and second output ports provide pressurized gas to power a vitrector. The output valve alternately provides pressurized gas to the first and second output ports. The isolation valve provides pressurized gas to the output valve. Two manifolds fluidly connect the output valve to the first and second output ports. A third manifold fluidly connects the isolation valve to the output valve. When the isolation valve provides pressurized gas to the output valve, the output valve operates at a high rate of speed to alternately provide pressurized gas to the first and second output ports thereby powering the vitrector.

Abstract: The present disclosure is related to a faucet device with touch control and display capabilities. The faucet device includes a gas providing unit, a faucet body, and a touch control and display system, wherein the faucet body and the touch control and display system are both coupled to the gas providing unit. The gas providing unit is for providing a predetermined gas to the faucet body, so as to enable the mixing of the predetermined gas with a water flow. The faucet body is equipped with a Venturi tube allowing for the predetermined gas to be transmitted automatically from the gas providing unit to the faucet body when the faucet body is turned on. The predetermined gas may not be transmitted to the faucet body when the water flow does not pass through the Venturi tube.

Abstract: The invention relates to a retainer device for retaining a reducing agent metering valve. The retainer device at least partially surrounds an interior space which is provided for holding the reducing agent metering valve. According to the invention, the retainer device has a sound dampening device which dampens sound vibrations emerging from the interior space.

Abstract: The invention relates to a measuring apparatus comprising an apparatus for forming a liquid optical waveguide having a substrate (1) having an at least partially curved closed microchannel (2) having a low-refractive coating (13), whereby there is formed in the substrate (1) at least one feed line (6) for supplying liquid, and whereby there is provided at least at one end of the closed microchannel (2) an apparatus for coupling light axially into the closed microchannel and/or for coupling light axially out of the closed microchannel (2), further comprising a light source (4), a light detector (5), and a first liquid pump (9) which supplies a sample liquid (7) to the closed microchannel (2) via the at least one feed line (6, 6a).

Abstract: A media control valve has a valve body having a media inlet and a media outlet and a plunger which is positioned within the valve body. The plunger is connected to a metering control assembly in the bore of the valve body and can be removed without disturbing the control assembly. A sleeve is positioned in the valve body between the valve body and the plunger. The sleeve includes an integral seal for sealing the valve to a flow device such as a base. The valve stem or post for housing the control knob may have metering marks for visually indicating the position of the plunger relative to the sleeve. The control knob on the valve is aligned with the metering marks on the valve body, whereby the valve opening may be calibrated by visual indication of the alignment of the metering marks with the lower edge of the control knob.

Abstract: A flow rate stabilizer of the present invention includes a main body and an elastic ring. The main body is formed with a receiving groove and a plurality of penetrating holes. The elastic ring is movably received in the receiving groove. The position of the elastic ring is able to be changed by water pressure so as to obstruct water flow partially. Au such, flow rate is stabilized. Structure of the flow rate stabilizer is simplified, so that producibility and durability of the present invention is well performed.

Abstract: Bonnet apparatus for use with fluid regulators are described. An example bonnet includes a body having a cavity to receive a loading assembly of the fluid regulator. A support structure is disposed in the cavity and extends across the cavity to increase an impact toughness or strength of the body.

Abstract: A lid opening and closing device includes a table configured to mount a carrier thereon with a front surface of a carrier lid configured to face toward a conveying gateway, a gas injecting hole provided in an opposing surface portion and configured to supply a purge gas used in removing particles adhering to the carrier lid, an advancing/retreating mechanism configured to move the carrier placed on the table toward and away from the opposing surface portion, and a control unit configured to output a control signal such that a purge gas is supplied from the gas injecting hole to the carrier lid, wherein the carrier is positioned such that the distance between the opposing surface portion and the carrier lid is 5 mm or less and the carrier lid and the opposing surface portion are spaced apart from each other, and the carrier lid is subsequently removed from the carrier.

Abstract: A particle separating structure for use with a turbine engine. The particle separating structure includes a main housing, first swirling structure, and second swirling structure. The first swirling structure is provided for swirling cooling fluid passing through a first cooling fluid flowpath defined in the main housing. The second swirling structure is provided for swirling cooling fluid passing through a second cooling fluid flowpath defined in the main housing. The first swirling structure is positionable in at least two positions, a first position allowing cooling fluid to pass through the first cooling fluid flowpath and a second position allowing cooling fluid to pass through the first and second cooling fluid flowpaths. The swirling of the cooling fluid causes particles in the cooling fluid to pass to a particle discharge zone while the cooling fluid passes out of the main housing through a cooling fluid outlet.

Abstract: A modular electrical bus system has a grounding circuit through a plurality of modular units with each unit being both electrically and mechanically connectable together via a bridge member connecting adjacent units and the main communication module. The bridge member and modular units are grounded together with a ground circuit that extends within both components.

Abstract: A stackable noise attenuating disk includes an inner perimeter edge and an outer perimeter edge. A plurality of inlet passages is disposed along the inner perimeter edge and a plurality of outlet passages is disposed along the outer perimeter edge. The plurality of outlet passages includes a plurality of first outlet passages and a plurality of second outlet passages. Each of the plurality of first outlet passages have a first width and each of the plurality of second outlet passages have a second width that is greater than the first width. Fluid entering the inlet passages passes through a plenum section of adjacent disks to exit through the first and second outlet passages. The first outlet passages and second outlet passages cooperate to disperse the noise peak frequencies of fluid exiting the plurality of outlet passages, thereby reducing the overall noise level of fluid exiting the plurality of outlet passages.

Abstract: A pneumatic manifold which can be constructed using standard PCB (Printed Circuit Board) construction techniques provides customised flow distribution around (and/or between) different members. By virtue of its PCB construction the manifold also may include conductive electrical tracks and fixing points common to other PCBs and possibly serving electrical pneumatic components.

Abstract: A novel system for safely transferring liquids from containers such as plastic jugs that are sealed by frangible seals, to conventional drums of the character having coupler-operated extractor valves. In one form of the invention, a standard coupler mechanism has been modified in a manner to provide means for rupturing the frangible seal of the sealed container without adversely affecting the manner in which the coupler is used to operate the extractor valve that is carried by the drum to which the liquid is to be transferred. Additionally, a novel adapter member has been provided for interconnecting the sealed container to the coupler mechanism.

Abstract: A flexible display apparatus including a first flexible film, a second flexible film, and a flexible display panel is provided. The second flexible film is disposed over the first flexible film, wherein a channel exists between the first flexible film and the second flexible film. The flexible display panel is disposed on the second flexible film. A fabrication method of a flexible display apparatus is also provided.

Abstract: A miniature hydroelectric power plant has a storage tank and a penstock for the flow of the water toward a recovery tank. A turbine is connected to a power generator and arranged in the penstock. The water with which the storage tank is supplied is fed from the recovery tank using a wheel provided with containers. The wheel is rigidly connected to a driving device engaging with a driving means. The miniature power plant is characterized in that the driving means is actuated by a self-contained and ecological source.

Abstract: A system and method for stimulating material movement and removing of deposits build up within industrial installations such as pipes, containers, ducts, boilers, heat-exchangers, silos and the like. The system may include a hose network including a plurality of distribution hoses branching from a central hose, far ends of the distribution hoses connected to openings provided on a wall of a vessel, and a high pressure gas supply system for supplying pressurized gas to the hose network. The system is designed to generate periodic gas blows into the vessel through the plurality of distribution hoses.

Abstract: A gas flow valve having pneumatic vibration dampening device to reduce the vibrations created by the flow of gas through the gas valve. The gas valve includes a gas flow conduit that terminates at a discharge opening. A valve member is movably positioned relative to the discharge opening and allows gas flow in a flow condition and prevents the flow of gas in a seated position. The valve member includes a gas passage formed within the valve member. At least one flexible membrane is mounted to the valve member and surrounds an outlet opening of the gas passage. The flexible membrane is inflated as the flow of gas within the gas flow conduit increases such that the flexible membrane contacts an inner surface of a stabilizing conduit. The interaction between the flexible membrane and the stabilizing conduit reduces the vibrations created by the flow of gas past the valve member.

Abstract: A flow limiter comprises a line segment with an air inlet and an air outlet and at least one resistance element. The resistance element is positioned within the line segment and impresses a predetermined flow resistance on an air flow that extends from the air inlet to the air outlet. Preferably, the resistance element extends at least in part in an axial direction of the line segment. Such a flow limiter is used to adjust an air volume flow and comprises particularly low generation of intrinsic noise.