Abstract: An aircraft fuel system having a fuel tank and a baffle dividing the fuel tank into a primary fuel containing space and a secondary fuel containing space. A fuel drain is provided through which fuel flows from the primary fuel containing space into the secondary fuel containing space. A primary fuel outlet draws fuel from the primary fuel containing space and a secondary fuel outlet draws fuel from the secondary fuel containing space, wherein fuel flow through the primary fuel outlet causes fuel flow through the secondary fuel outlet. The mass flow rate of fuel through the fuel drain is restricted so that the allowable mass flow rate of fuel through the secondary fuel outlet is configured to be greater than the allowable mass flow rate of fuel through the fuel drain in the baffle.

Abstract: A coagulation bath is provided with a coagulation liquid inlet, wherein the coagulation liquid inlet has one or more mouths, which are arranged beneath the coagulation liquid level of the coagulation bath; in particular a spinning bath system with a coagulation liquid inlet and an entry region for spinning yarns which are solidified in the spinning bath, wherein the entry region is provided at a position in which, when the spinning bath is filled with coagulation liquid, the liquid surface is the surface of the coagulation liquid, the coagulation liquid inlet has one or more mouths arranged beneath the entry region and are directed to spinning yarns introduced into the spinning bath such that fresh coagulation liquid flows against the spinning yarns during operation, and optionally a liquid fill level regulator and possibly further tanks with different coagulation liquid composition and methods for spinning yarns in a spinning bath.

Abstract: Provided is a fuel tank system wherein the liquid levels of fuel in two fuel storage portions can be equally maintained, and the fuel amount in each fuel tank can be estimated with a high degree of accuracy. The fuel tank system is provided with a fuel tank in which a main tank portion and a subsidiary tank portion are formed; a siphon tube which extends from the main tank portion to the subsidiary tank portion, to transfer fuel from one tank portion to the other tank portion; and an electronic control unit (ECU) for determining whether or not the fuel is transferred via the siphon tube (in the transfer state). The ECU determines that the fuel is in the transfer state when the change rate of a sender signal is equal to or less than a predetermined threshold value (VF_th).

Abstract: A fuel introducing member is connected to an opening end of a siphon pipe forming a fuel tank. The fuel introducing member has an opening for introducing fuel within the tank, and the opening is formed in the upper surface of a cover section. A lid body is pivotably mounted to the upper surface. When the opening is above the level of fuel, the lid body closes the opening by the weight of the lid body, and when the opening is below the level of the fuel, the lid body floats in the fuel to open the opening. The opening is located below the upper end of the inner diameter of the opening end of the siphon pipe.

Abstract: A fuel pump module, in which an in-tank filter and a fuel pump are installed at respective locations and held by a pump retainer, thereby allowing fuel to easily flow in the fuel pump module and realizing smallness and improved filtering performance of the fuel pump module.

Abstract: The invention relates to a system for supplying a consumer with gaseous fuel. Said system comprises at least one compressed gas container, which is fluidically connected to the consumer via a collecting line and valves. To extensively utilise the capacity of the compressed gas container, a reserve container (3) is connected to the collecting line (12) via a first valve (9) and the system is equipped with an ejector pump (14), which is operated by gas from the reserve container (3) and delivers gas from the compressed gas container(s) (1, 2, . . . ) into the collecting line (12). To achieve this, with respect to the flow, the ejector pump (14) is situated between the compressed gas container(s) (1,2, . . . ) and the consumer (5).

Abstract: Provided is a fuel pump module in which a portion of fuel transmitted from a fuel pump provided in a reservoir or fuel returned from an engine is supplied to a first jet and a second jet and a portion of the fuel is supplied from a first jet tower to a second jet tower through a connection tube connecting the first jet tower and the second jet tower to each other when the returned fuel passes through the first jet and the second jet and is then jetted to each of the first jet tower and the second jet tower to fill an inner portion of the second jet tower with the fuel, such that the fuel in a second space part of a fuel tank is rapidly transmitted, thereby making it possible to stably supply the fuel to the engine.

Abstract: A fuel introduction member is connected to an open end of a siphon tube which constitutes a part of a fuel tank. The fuel introduction member is provided with an opening through which a fuel is introduced from the tank into the siphon tube and from the siphon into the tank, a lid portion which is swung by the hydraulic pressure from the siphon tube so as to open the opening, and a float member which floats on the fuel in accordance with the rise of a fuel liquid surface in the tank to displace the lid portion in order to open the opening.

Abstract: A fuel system for use in a fuel tank having first and second tank portions includes first and second fuel pumps in the first and second tank portions, respectively. A first fuel reservoir is provided in the first tank portion and a second fuel reservoir is provided in the second tank portion. A first crossover fuel line extends between the first and second tank portions, and a second crossover fuel line extends between the first and second tank portions. A first jet pump in the first tank portion communicates with the first crossover fuel line for transferring fuel through the first crossover fuel line to the second tank portion, and a second jet pump in the second tank portion communicates with the second crossover fuel line for transferring fuel through the second crossover fuel line to the first tank portion.

Abstract: Embodiments described herein provide micro-fluidic systems and devices for use in performing various diagnostic and analytical tests. According to one embodiment, the micro-fluidic device includes a sample chamber for receiving a sample, and a reaction chamber for performing a chemical reaction. A bubble jet pump is structured on the device to control delivery of a fluid from the sample chamber to the reaction chamber. The pump is fluidically coupled to one or more chambers of the device using a fluidic channel such as a capillary. A valve may be coupled to one or more chambers to control flow into and out of those chambers. Also, a sensor may be positioned in one or more of the chambers, such as the reactant chamber, for sensing a property of the fluid within the chamber as well as the presence of a chemical within the chamber.

Abstract: The present invention is directed to providing a transfer tube assembly mounted on a saddle type fuel tank. The assembly of the present invention includes: a main fuel pump allowing a fuel pump system to deliver fuel to the engine; a sender delivering residual fuel to the main fuel pump; a wire harness connecting the main module and the sender and configured to inform of a fuel amount in the sender; and a transfer tube for transferring the residual fuel in the sender to the main fuel pump. The wire harness and the transfer tube are integrally coupled and configured so that a function of the wire harness can be performed simultaneously with a function of the transfer tube.

Abstract: An air exchange system places the air pumps or fans outside of the main air outflow pathway through a device, such as a range hood. By using this configuration, the system is made safe, easy to maintain with less noise and may even increase the efficiency of the air pump by not subjecting it to debris, particles or turbulence in the air flow, also flexible to add more pumps with significant increase the size of the air exchange system. Air pumps can be operably connected to push air into two or more air reservoirs. Each air reservoir has a narrow air outlet slit along with a Coanda design. When air comes out of the narrow air outlet, it has high speed and generates a negative pressure due to the Bernoulli effect. Such negative pressure will bring more air around into the air flow system, thus causing a desired air exchange.

Abstract: The present invention includes a device that comprises a suction jet pump, that is arranged in a reservoir pot and has a nozzle and a mixing duct provided downstream the nozzle and arranged perpendicular to a pot base of the reservoir pot. The outlet of the mixing duct has a deflection means, which the jet of the nozzle impinges when the mixing duct is unfilled and has an additional volume formed at the outlet of the mixer by an offset widening of the mixer duct. This additional volume prevents the column of liquid in the mixing duct from being forced out by the propulsion jet of the suction jet pump. Thus the lead time of the suction jet pump is approximately equal in all operating states.

Abstract: Suction jet pumps include a driving line which leads via a jet outlet into a suction chamber, where the suction chamber has a suction opening which interacts with a valve element and through which fluid is sucked into the suction chamber. The valve element together with the suction opening forms a suction valve. The suction jet pump is driven by a driving stream flowing via the driving line. The suction jet pump is arranged in a storage tank and sucks fuel out of a fuel tank into the storage tank. The driving line has a bypass opening which leads into the suction chamber and is arranged in such a manner that the bypass stream thereof acts on the valve element.

Abstract: A paint circulation system for use in painting a workpiece. The paint circulation system operates to deliver paint to a paint applicator placed adjacent a workstation such as a paint spray booth. The paint is continuously circulated through the system and is returned to a paint reservoir through a paint return conduit. A coiled tube back pressure regulator located on the paint return conduit between the paint return manifold and paint reservoir functions to achieve a desired pressure drop in the paint circulation system while reducing paint shear and degradation typically associated with conventional pressure regulators.

Abstract: An assembly is provided that integrates a jet pump with a liquid trap to drain liquid fuel from vapor flow, such as vapor vented from a fuel tank. The assembly includes a housing that has a liquid trap configured to trap liquid carried in vapor flowing through the housing. A jet pump has a venturi nozzle and is in selective fluid communication with the liquid trap so that liquid flow through the venturi nozzle induces draining of the liquid trap.

Abstract: A jet pump assembly includes a fuel supply conduit, a first jet pump integrally formed as a single piece with the fuel supply conduit and in fluid communication with the fuel supply conduit, a second jet pump integrally formed as a single piece with the fuel supply conduit and in fluid communication with the fuel supply conduit, and an inlet conduit integrally formed as a single piece with the second jet pump.

Abstract: A fluid processing device for processing a multiphase fluid stream including a mixture of at least a gas and a liquid is disclosed. The fluid processing device may include at least one separator configured to separate the fluid stream into a liquid portion and a gaseous portion and deposit the liquid portion into a liquid reservoir. The gaseous portion may be directed to a compressor configured to pressurize and discharge a pressurized gas into a fluid discharge line. A portion of the pressurized gas may be further pressurized and directed to at least one ejector pump fluidly coupled to the liquid reservoir and configured to draw in liquid and discharge pressurized liquid into the fluid discharge line.

Abstract: A delivery unit (4) has a compensating baffle pot (5) provided with a fuel pump (6) arranged therein and a jet sucking pump (8) for conveying a liquid to the baffle pot (5). The jet sucking pump (8) has a propulsion jet nozzle (13) provided with an opening, a mixing pipe (14), a suction opening with a suction line (11) and a deflecting element (16) located downstream of the mixing pipe (14).

Abstract: A lubricant vent structure of a fuel pump for a vehicle, may include a mounting unit mounted to a pumping unit, a plurality of link units having a support link and a stopper restricting a rotatable range of the support link, wherein the plurality of link units is pivotally connected each other in a series by an elastic member respectively and the elastic member elastically supports the support link in the direction of the maximum rotatable range thereof, and a vent tube having an open end fixed to the last support link of the link units and communicating with a lubrication space of the pumping unit of the fuel pump, wherein the support link of the first link of the link units is pivotally fixed to the mounting unit of the fuel pump.

Abstract: A fluid supply system is provided, especially for delivering liquid hydrocarbon to a fuel-operated vehicle heater or to a reformer. The system includes a fluid reservoir (12), a first fluid line (28) from the fluid reservoir (12) to an on-off valve (30), a second fluid line (32) from the on-off valve (30) to a first system area (14) to be fed with fluid, and a third fluid line (34) from the on-off valve (30) to the reservoir (12). The on-off valve (30) establishes a connection between the first fluid line (28) and the second fluid line (32) in a first valve position and establishes a connection between the second fluid line (32) and the third fluid line (34) in a second valve position. A first fluid delivery arrangement (26) is provided for delivering fluid from the reservoir (12) into the second fluid line (12). A second fluid delivery arrangement (20, 24) is provided for delivering fluid from the third fluid line (34) into the reservoir (12).

Abstract: A saddle tank for internal combustion engines of motor vehicles includes an oblong boom, which is connected at one end to a swirl pot located in the first chamber and rests toward the other end on a lower saddle surface of the saddle and a retainer for a Venturi nozzle or pump, which is mounted so it is rotatable on the other end of the boom.

Abstract: A fuel tank has a primary sump and secondary sump. A first vent valve and a second vent valve are disposed within the fuel tank. The first vent valve is closed when a level of fuel in the primary sump is equal to or higher than a first predetermined filling level, and the second vent valve is closed when a level of fuel in the secondary sump is equal to or higher than a second predetermined filling level in a refueling procedure.

Abstract: Devices for delivering fuel are already known, comprising a suction jet pump that is arranged in a storage crucible and has a nozzle and a mixer duct provided downstream of the nozzle and arranged perpendicular to the bottom of the storage crucible, wherein at the outlet of the mixer duct an impingement means is arranged, against which the jet of the nozzle impinges in the substantially unfilled mixer duct, and in doing so is at least partially returned into the mixer duct. It has been found that despite the impingement means the propulsive jet tends to eject the liquid column present in the mixer duct. As soon as the liquid level in the storage crucible has decreased below the outlet of the mixer duct, no more fuel can replenish from above into the mixer duct so that the mixer duct may be unfilled after switching off the suction jet pump.

Abstract: A massage jet pump may include a motor to rotate a first shaft, a first magnetic pole array may be adapted to be rotated by the first shaft, a second magnetic pole array may be magnetically coupled to the first magnetic pole array and may rotate in accordance with the first magnetic pole array, an impeller may pump the fluid in accordance with the rotation of the second magnetic pole array. The pump may include a mounting housing for pump mounting and prevent water leaking to the motor, a jet assembly to pump the water into dual jet streams, and an electronic sensor circuit to detect the presence of the jet assembly and shut down the motor when the jet assembly is removed from the pump or water level in the basin is low. The jet assembly may include a back cover, a fixed shaft, an impeller, a second magnet plate, and a front cover. The front cover of the jet assembly includes two output ports which guide the water jet streams in parallel or 45 degrees with respect to the axis of the fixed shaft.

Abstract: A fuel tank has a primary sump and secondary sump. A first vent valve and a second vent valve are disposed within the fuel tank. The first vent valve is closed when a level of fuel in the primary sump is equal to or higher than a first predetermined filling level, and the second vent valve is closed when a level of fuel in the secondary sump is equal to or higher than a second predetermined filling level in a refueling procedure.

Abstract: A hose connection (51) includes mounting structure (32) and suction structure (46) having an axis (B). The suction structure is mounted to the mounting structure such that the suction structure can rotate with respect to the mounting structure about the axis. The hose connection includes a hose (26?) coupled to the suction structure.

Abstract: A fuel system that supplies fuel to an engine of a vehicle. The fuel system includes a pump that pumps fuel and a controller that selectively changes operation of the pump between an electronic returnless fuel system mode and a mechanical returnless fuel system mode. In the electronic returnless fuel system mode, the outlet of the pump is varied, and in the mechanical returnless fuel system mode, output of the pump is maintained approximately constant.

Abstract: A suction jet pump with a propulsion jet nozzle, a mixing tube, a suction port and a suction line attached thereto, wherein at least part of the mixing tube is arranged in a pot. The suction jet pump is used to supply fuel in a fuel container or from a fuel container in a swirl pot that is arranged inside the fuel container.

Abstract: Suction jet pumps are already known with a driving line which leads via a jet outlet into a suction chamber, where the suction chamber has a suction opening which interacts with a valve element and through which fluid can be sucked into the suction chamber. The valve element together with the suction opening forms a suction valve. The suction jet pump is driven by a driving stream flowing via the driving line. The suction jet pump is arranged in a storage tank and sucks fuel out of a fuel tank into the storage tank. At low levels in the fuel tank, air may sometimes be sucked up and conducted into the storage tank, as a result of which foaming occurs in the storage tank. However, the large volume of the foam causes fuel to be displaced, which may result in partial emptying of the storage tank. This effect is also referred to as dynamic leakage. A characteristic curve of the suction jet pump that represents the suction power as a function of the driving stream has a comparatively steep gradient.

Abstract: A vacuum generator driven by compressed air and arranged to supply vacuum to a vacuum gripper element, wherein a chamber (6) is associated with the vacuum generator and arranged to be brought in flow connection (9) with the vacuum gripper element via a valve (15) which is actuated by overpressure accumulated in the chamber to open the connection (9) to the vacuum gripper element in order to discharge the overpressure to the vacuum gripper element in result of interruption of the compressed air flow (P). The vacuum generator is characterized in that the chamber (6) in addition includes a flow connection (11) with the ambient atmosphere, and in the additional flow connection (11) a one-way valve (10) which is arranged to open the connection (11) with the atmosphere in result of the air pressure in the chamber (6) falling below the atmospheric pressure.

Abstract: A main suction, that is a portion of a fuel feed-out pipe, and a bent portion, that is a lowermost portion formed at a return pipe, are both disposed within a fuel tank, positioned lower than a lowest liquid surface within a reserve cup, and can always be maintained in a state of existing within fuel. A fuel expelling port of a jet pump is positioned higher than a highest liquid surface at the reserve cup, and is always positioned higher than fuel within the reserve cup. As a result, a fuel tank structure in which suppression of flowing-out of fuel from the return pipe and the like, an improvement in the fuel transferring performance of the jet pump, and suppression of backward flowing of fuel through a transfer pipe, can all be realized is obtained.

Abstract: A submersible turbine pump (STP) is provided. The STP includes a manifold having an integral siphon connection coupled to a fuel flow path in the STP and a siphon cartridge removably inserted into the manifold via the siphon connection. In general, the siphon cartridge includes a nozzle that directs fuel from the fuel flow path through a venturi when the STP is energized, thereby creating a vacuum in a chamber within the siphon cartridge. A connection point of the siphon cartridge is fluidly coupled to the chamber such that a fluid connection is provided from the exterior of the siphon cartridge to the vacuum.

Abstract: In a feed unit for feeding fuel from a fuel container of a motor vehicle a surge part (1) has a base plate (9) and an adjoining tubular section (10). The base plate (9) is fabricated in one piece with a nozzle (15) and a mixer pipe (16) of a suction jet pump (8) and has receptacles (21, 13) for a fine filter (3) and for supporting rods (22) of a fuel pump (2). The feed unit is of particularly simple design as a result of this and can be fabricated in a cost-effective way.

Abstract: A fuel supply system for a motor vehicle has a sucking jet pump (6, 7) which is connected to a flow line (5). The valve (16, 17) reduces the cross-section of an opening (20) in a nozzle (14, 15) of the sucking jet pump (6, 7) with increasing pressure in the flow line (5). Hydraulic losses in supplying the sucking jet pump (6, 7) with fuel as a pump fluid are prevented and the conveying performance of the sucking jet pump (6, 7) is maintained, preferably, at a constant level.

Abstract: Provided is a water supply apparatus for use in an ice maker, which allows easy prevention of an outflow of water due to a siphon phenomenon after stopping a water supply operation; which enables solving a problem that supplying the water is stopped due to a foreign substance or the like mixed in the water; and which comprises a further hygienic water supply mechanism.

Abstract: An apparatus includes a housing configured to receive a portion of a fuel pump. The housing defines a first flow path, a second flow path and a third flow path. The first flow path is in fluid communication with a fuel outlet portion of the fuel pump. The second flow path is in fluid communication with the first flow path. The third flow path is in fluid communication with the second flow path. A side wall of the housing defines a venturi within the second flow path at a location downstream from an intersection of the third flow path and the second flow path. A flow control member is disposed within the second flow path at a location upstream from the intersection of the third flow path and the second flow path. The flow control member is configured to regulate the fuel flow within the second flow path.

Abstract: A system and a method for making an injectable mixture using at least one first pulverulent component and a second liquid component with a first piston/cylinder arrangement with a cylinder with an axial extension and a piston, wherein the cylinder includes a measured amount of the pulverulent component, a separate reservoir including a corresponding measured amount of the liquid component, and a transfer device for sealed transfer of said amount of the liquid component to the cylinder for subsequent mixing and injection of the completed mixture. The first piston/cylinder arrangement is an injection syringe. A mixing element being manoeuvrable by a user is positioned inside the cylinder. At least one gas transferring channel means leading to the cylinder is arranged at the cylinder. Engagement means are arranged for connecting the first injection syringe to the separate reservoir during transfer of the liquid component.

Abstract: An innovative method and apparatus for disposing of waste fluids, especially human body fluids such as are generated during surgery, into a hospital's sanitary sewer system is provided. A conduit system is adapted to transport waste fluid from a receptacle to a sanitary sewer using an eductor having a venturi device. The conduit system includes first and second conduits. First and second connectors are used to easily connect the first conduit to the second conduit. The second connector includes a flap that acts as a check valve.

Abstract: A hose connection (51) includes mounting structure (32) and suction structure (46) having an axis (B). The suction structure is mounted to the mounting structure such that the suction structure can rotate with respect to the mounting structure about the axis. The hose connection includes a hose (26?) coupled to the suction structure.

Abstract: An in-tank fuel supply unit is provided for supplying fuel from a fuel tank to an engine. The fuel supply unit generally comprises a fuel delivery module and a jet pump assembly selectively attachable to the fuel delivery module. The fuel delivery module has a housing defining a reservoir and includes a fuel pump for pressurizing fuel in the reservoir. The jet pump assembly has a suction tube defining a suction chamber and a nozzle situated inside the suction chamber. The nozzle receives pressurized fuel from the fuel pump and sprays the fuel from a nozzle tip at high velocity to draw additional fuel into the suction chamber through an inlet formed in the suction tube.

Abstract: A fuel tank contains a system for the removal of air, which includes an air removal line to connect the interior of the tank with the outside ambient atmosphere, whereby this line forms a siphon, and at the deepest location of the air removal line a connection section is provided with a suction opening connected to a suction source.

Abstract: A fuel feed apparatus includes a fuel pump for pumping fuel from a fuel tank to an internal combustion engine. A pressure-control valve controls pressure of fuel, which is discharged from the fuel pump, to be equal to or less than a first pressure. A jet pump generates suction pressure by jetting fuel, which is discharged from the fuel pump, partially through a nozzle. A pressure-retention valve is provided in an upstream of the jet pump with respect to fuel flow from the fuel pump for maintaining pressure of fuel in the upstream at a second pressure, which is less than the first pressure. A pump bracket holds the fuel pump. The pressure-control valve and the pressure-retention valve are connected to the pump bracket.

Abstract: A fuel pump system for a fuel tank having a first and a second section has a fuel pump and a jet pump disposed in the first section. The jet pump draws fuel from the second section of the fuel tank through a transfer line and delivers it to the first section of the fuel tank. A check valve is located in the second section of the fuel tank to prohibit flow from the first section to the second section but to allow flow from the second section to the first. In this manner, the fluid is retained within transfer line so that a siphoning action can occur between the second section and the first section of the fuel tank.

Abstract: A valve mechanism to control fluid flow between a fluid pumping device and a system that includes an inlet from the fluid pumping device, a first valve, a second valve, a first outlet fluidly connected to the system, and a second outlet. The first valve prevents backflow of fluid when the fluid pumping device discontinues pumping fluid to the system. The second valve checks fluid flow through the valve to the first outlet when fluid pressure at the inlet is less than a first predetermined pressure. The second valve permits fluid flow from the pump through the valve to the system only when fluid pressure at the inlet is greater than the first predetermined pressure. The second valve prevents fluid pressure in the system from substantially exceeding a second predetermined pressure when the pumping device is not pumping fluid to the system.

Abstract: In a fuel container (1) for a motor vehicle having a plurality of chambers (2, 4), a suction jet pump (18, 19) with a filling level sensor (11, 12) is arranged in each of the individual chambers (2, 4). A valve (24, 25) is arranged in a propellant line (20, 21) leading to the suction jet pump (18, 19). When a chamber (2, 4) is virtually empty, the supply of fuel to the suction jet pump (18, 19) is disabled and an unnecessary movement of the fuel is thus avoided.

Abstract: In a fuel supply device disposed in a fuel tank, a pump module is constructed with at least a fuel pump, a fuel filter and a pressure regulator, and is installed in a sub-tank. A filter case of the fuel filter has first ribs and second ribs, so that an axially position between the pump module and the sub-tank is set by the first ribs, and a circumferential position therebetween is set by the second ribs. Further, a fuel inlet of a jet pump is formed in an inner bottom surface of the sub-tank, and an inner surface of the fuel inlet of the jet pump is tapered. Therefore, a fuel outlet of the pressure regulator is guided while being connected to the fuel inlet of the jet pump. Accordingly, the fuel supply device can be assembled easily.

Abstract: The present invention provides a fuel delivery system for a saddle fuel tank wherein a fuel pump and a jet pump are positioned within an active side of the tank. The jet pump is directly driven by the fuel pump to draw the fuel from a passive side of the tank to the active side of the tank.

Abstract: A fuel supplying apparatus for use with a main fuel tank and an engine includes a fuel discharge pipe for supplying fuel to the engine, a sub-tank disposed in the main fuel tank, a fuel pump for pressurizing fuel and a jet pump. The jet pump includes a throat and a nozzle projecting into the throat from the bottom wall of the sub-tank. The throat has a fuel inlet opening disposed outside the sub-tank and a fuel discharge opening disposed in the sub-tank. When pressured fuel is injected into the inlet opening of the throat, the fuel in the main tank is sucked to the sub-tank.

Abstract: A fuel tank, in particular for a motor vehicle having a tank venting system, comprises a sucking jet pump which feeds fuel into a sucking-jet-pump feedline which fills a storage pot arranged in the tank. The sucking jet pump has a driving nozzle. A line leads from the region of the tank roof into a negative pressure region of the sucking jet pump.