EP4163249A1 - Filling valve with leakage protection device - Google Patents

Abstract

The subject matter of the invention is a dispensing valve for dispensing a fluid, comprising an inlet opening for connection to a fluid supply line, an outlet end (12) opposite the inlet opening, a main valve for controlling the flow of fluid through the dispensing valve and an anti-leakage valve (13) arranged downstream of the main valve, with a valve seat (14) and a valve body (15, 16) which can be moved upstream into a closed position. According to the invention, the valve body (15, 16) has a first sub-body (15) and a second sub-body (16) designed to be movable relative to the first, with a first fluid path being created by a downstream movement of the first sub-body (15) relative to the valve seat (14). (17) can be released and wherein a second fluid path (18) can be released by a downstream movement of the second part body (16) relative to the first part body (15). With the two-part valve body according to the invention, the flow through the dispensing valve can be optimized and the back pressure occurring in front of the outlet protection valve can be reduced.

Description

The subject matter of the present invention is a dispensing valve for dispensing a fluid. The dispensing valve includes an inlet port for connection to a fluid supply line, an outlet end opposite the inlet port, a main valve for controlling fluid flow through the dispensing valve, and an anti-leakage valve disposed downstream of the main valve. The anti-leak valve includes a valve seat and a valve body moveable upstream to a closed position.

When fluids are dispensed by means of such a dispensing valve, residual quantities of the fluid usually remain inside the dispensing valve after the dispensing process has ended, in particular after the main valve has been closed. Particularly with high viscosity fluids, a significant amount of the fluid can adhere to the interior walls of the nozzle. If the dispensing valve is tilted downwards on the outlet side, these residual amounts can leak out, which is often undesirable. It is known to provide an anti-leakage valve to prevent leakage of the remaining amounts of fluid (see, for example EP 2 687 479 A1 ). The outlet protection valve is usually designed in such a way that it is opened by the pressure of the fluid flow when the main valve is opened.

A problem with the prior art is that when the main valve is open, the flow of fluid is restricted by the anti-leakage valve. In particular, a high dynamic pressure and undesirable turbulence can occur at the outlet protection valve. Against this background, it is the object of the present invention to provide a nozzle in which the problems known from the prior art occur less severely.

This problem is solved with the features of the independent claims. Advantageous embodiments are described in the dependent claims. According to the invention, the valve body has a first part-body and a second part-body designed to be movable relative to the first part-body. A first fluid path can be released by a downstream movement of the first partial body relative to the valve seat. A second fluid path can be released by a downstream movement of the second part-body relative to the first part-body.

First, some of the terms used in the present description are explained. The anti-leakage valve serves to prevent residual amounts of the fluid, which remain in the dispensing valve downstream of the main valve after the main valve has been closed, from escaping. For this purpose, the valve body of the leakage protection valve can be held in the closed position by means of a holding force which is large enough to prevent the residual amounts from escaping. However, the holding force is regularly so small that an opening pressure produced by the fluid flow when the main valve is open is sufficient to open the leakage protection valve.

The dispensing valve is preferably designed for dispensing liquids, in particular fuels such as petrol or diesel. The terms "upstream" and "downstream" used in the description refer to the main flow direction of the fluid, which is aligned from the inlet opening to the outlet end.

Because the leakage protection valve according to the invention has a first part-body and a second part-body that can be moved downstream relative thereto, the fluid flow can be more uniform and pass through the anti-leak valve more stably, while also reducing the back pressure in front of the anti-leak valve.

In the context of the invention, it was recognized that in the prior art in front of the outlet protection valve, particularly with large flow rates, a large dynamic pressure often builds up, which mechanically stresses the components inside the nozzle and reduces the achievable flow through the nozzle. In addition to the first fluid path, which is opened by the movement of the first partial body relative to the valve seat, the second partial body according to the invention, which is designed to be movable relative to the first partial body, enables a second fluid path to be released, which enables additional flow through the leakage protection valve. The second partial body can also be moved relative to the first partial body by the opening pressure which is generated by the fluid flow after the main valve has been opened. In this way, the fluid flow passing through the dispensing valve can be divided between the first fluid path and the second fluid path, which overall leads to improved flow dynamics with an increased throughput and lower dynamic pressure in front of the anti-leakage valve. The first fluid path can in particular lead past an inlet-side end of the first part-body on the outside, wherein the second fluid path can lead past the inlet-side end of the first part-body on the inside.

In a preferred embodiment, the first body part has at least one passage opening for the second fluid path, the passage opening being able to be released by the movement of the second body part relative to the first body part. Via the through-opening, the inside of the first partial body can be passed Flow are merged with the flow directed along the outside, which leads to a further improvement in the flow dynamics.

Furthermore, the second partial body can have a sealing surface for contact with a counter-sealing surface of the first partial body, wherein the counter-sealing surface preferably forms a partial body valve seat for the first partial body. In this case, the through-opening of the first partial body can in particular be located downstream of the counter-sealing surface when the leakage protection valve is in the closed position. The sealing surface and the counter-sealing surface can ensure that the leakage protection valve closes securely in the closed position and the residual amounts of fluid are thus reliably prevented from escaping.

In a preferred embodiment, the sealing surface of the second body part and the counter-sealing surface of the first body part are at an angle of between 60° and 120°, preferably between 80° and 100°, to an axial direction of the leakage protection valve. More preferably, the sealing surface of the second part-body and the counter-sealing surface of the first part-body are essentially perpendicular to the axial direction of the anti-leakage valve. If the axial direction of the leakage protection valve is essentially perpendicular to the sealing surfaces, a good sealing effect can be achieved in a simple manner. In addition, the sealing surface and the counter-sealing surface can preferably be designed in such a way that in the closed position of the anti-leakage valve they are in essentially planar contact with one another.

It is advantageous if the second partial body has a peripheral surface which is completely radially surrounded by the first partial body in the closed position of the outlet protection valve. The second partial body can in particular be arranged concentrically to the first partial body. In this way, the second partial body can be guided securely within the first partial body, with the counter-sealing surface of the first partial body being able to bear against the sealing surface of the second partial body over its entire circumference in the closed position.

The cross section of the second partial body preferably tapers starting from the sealing surface towards the end on the inlet side. It has been shown that a further improvement in flow properties can be achieved in this way. In particular, an outer surface of the second partial body in the area of the taper can have a first section and a second section arranged upstream of the first, with the first section being curved outwards and the second section being curved inwards. This curvature allows turbulence in the second fluid path to be avoided, in particular when it flows past the sealing surface, as a result of which the flow can be further improved and the back pressure can be further reduced.

In a preferred embodiment, at least one of the partial bodies can be slidably guided relative to the valve seat by means of a linear guide, the linear guide preferably having a shaft which extends in the axial direction of the anti-leakage valve and is slidably guided through a through-opening in the second partial body. The through hole may extend centrally along an axial direction of the second body part. The second partial body can also be designed to be rotationally symmetrical relative to its axial direction.

Alternatively or additionally, the linear guide can be arranged rigidly relative to the valve seat, preferably in the axial direction of the anti-leakage valve have registration opening extending through which a guide leg of the partial body is slidably guided. Furthermore, one of the partial bodies can have at least one guide leg on which the respective other partial body is slidably guided. With the measures described above, the first and second sub-bodies can be securely guided along the axial direction of the anti-leakage valve, so that a reliable closing action for preventing the leakage of a residual amount of fluid and a reliable opening movement when the main valve is opened is ensured.

In a preferred embodiment, one of the partial bodies is designed to take the other partial body with it into the closed position when it moves in the direction of the closed position. In particular, the second partial body can be designed to entrain the first partial body into the closed position during a movement in the direction of the closed position. In this case, the first partial body is preferably carried along by a force transmission from the sealing surface of the second partial body to the counter-sealing surface of the first partial body. This configuration has the advantage that it is sufficient if the second partial body is actively moved into the closed position. The first partial body is then taken along without an additional restoring element being necessary. For this purpose, the dispensing valve can have a mechanical restoring element, for example a spring element, which is designed to urge the second partial body into the closed position.

In an advantageous embodiment, the second part-body has a magnetic material, with a counter-magnetic body arranged upstream of the second part-body being provided, which is designed to separate the first and second To keep part of the body by magnetic interaction in the closed position of the outlet protection valve. The magnetic material may be a material that is attracted to a pole of an external magnetic field. In particular, the magnetic material can be a ferromagnetic material. The counter magnet body can be a permanent magnet. It is also possible that the magnetic material is in the form of a permanent magnet and the counter-magnetic body is made of a material that is attracted by one pole of an external magnetic field. The first partial body is preferably made of a non-magnetic material. More preferably, the magnetic material and the housing sections surrounding the counter-magnet body and/or an outlet pipe of the dispensing valve are also made of a non-magnetic material. If the elements surrounding the magnetic material and the counter-magnetic body are made of a non-magnetic material, the magnetic interaction between the magnetic material and the counter-magnetic body is not disturbed.

Preferably, the second partial body has a maximum open position, which is outside of an effective range of the counter-magnet body, so that the second partial body remains in an open position after a fluid delivery has ended, wherein the second partial body can be moved back into the effective range, within which, using gravity it is pulled into the closed position by the counter-magnet body when the dispensing valve is tilted upwards on the outlet side. An angle of inclination of the axial direction of the leakage protection valve relative to the vertical can be, for example, between 0° and 110°, preferably between 0° and 90°, more preferably between 0° and 70° during fluid delivery, with an angle of 0° indicating an orientation in the direction of flow means vertically down. If the second body part assumes the maximum open position during a fluid delivery, it remains in the open position after the end of the fluid delivery due to this design, without the second part body automatically moving towards the closed position caused by the magnetic force. This means, for example, when refueling a motor vehicle, in which an outlet-side end of the nozzle is inserted into a filler neck inclined downwards, that residual amounts of fluid which remain inside the nozzle can initially leak into the tank. This prevents residual amounts of fluid that have already passed through the main valve from remaining in volumes of the dispensing valve downstream of the main valve, and thereby preventing the amount of fluid recorded by a calibrated fluid amount meter from deviating from the amount of fluid actually dispensed in a legally relevant manner.

The second partial body ( by decreasing the downhill force acting towards the outlet end or through the action of a downhill force directed towards the inlet end) back into the area of action of the counter-magnetic body, within which it is pulled into the closed position, taking the first partial body with it. Such a lifting usually takes place anyway when the nozzle is removed from a filler neck, so that in this respect a secure closing of the outlet protection valve is ensured.

In an advantageous embodiment, the outlet protection valve is arranged at an inlet end of an outlet pipe of the nozzle. Within the scope of the invention, it was recognized that, particularly with fluids of low viscosity, only small amounts of fluid remain in the outlet pipe, so that an arrangement at the inlet end of the outlet pipe is sufficient both from the point of view of calibration law and in relation to effective drip protection. At the same time, it has been shown that more installation space is available for the outlet protection valve at the inlet end of the outlet pipe and the arrangement at the inlet end can therefore be realized in a structurally simpler manner.

The subject matter of the invention is also a dispensing valve for dispensing a fluid, comprising an inlet opening for connection to a fluid supply line, an outlet end opposite the inlet opening, and a main valve for controlling the flow of fluid through the dispensing valve. The dispensing valve comprises a sensor line which extends to the outlet end and which is operatively connected to an automatic switch-off device, with the sensor line being subjected to a vacuum during the dispensing of the fluid, so that a gas flow can be sucked in via the end of the sensor line.

Such automatic switch-off devices, which cause the main valve to close automatically when a liquid level reaches or exceeds the end area of the sensor line, are known in principle from the prior art (see e.g EP 2 386 520 A1 ). So far, however, the prior art has completely neglected the fact that with ordinary sensor lines, due to the vacuum required to operate the automatic switch-off device, a certain amount of fluid enters the sensor line when the liquid level reaches the end of the sensor line. The entered amount of fluid could therefore in the prior art after Fluid discharged from the sensor line in an uncontrolled manner.

Against this background, it is an object of the present invention to at least partially avoid the disadvantage described above. This object is achieved with the features of claim 14. Advantageous embodiments are described in claims 15 and 16.

According to the invention, the sensor line has an end area in which a sensor line valve designed to close the sensor line is arranged, which can be moved into an open position by means of the gas flow sucked in through the sensor line.

The sensor line valve according to the invention can be used to close the sensor line and thus prevent this quantity of fluid from escaping undesirably, and the quantity of fluid entering can also be slightly reduced. In one embodiment, the sensor line valve can be biased into the closed position by a restoring element. This measure can further reduce the undesired leakage of said fluid quantity. The reset element mentioned above is preferably dimensioned in such a way that the sensor line valve is moved into the open position by the resulting gas flow during the dispensing of the fluid. The functionality of the automatic shutdown device is not impaired in any way.

In an advantageous embodiment, the sensor line valve is designed to be moved into the closed position by tilting the dispensing valve downwards on the outlet side (using the force of gravity).

The idea of arranging a sensor line valve as described above in the end region of a sensor line, as well as the more detailed refinements of this idea described below, have independent inventive content.

In a preferred embodiment, the sensor line valve has a valve seat and a valve body which is movably arranged upstream of the valve seat within the sensor line, so that the valve body can be moved downwards into the valve seat by tilting the dispensing valve on the outlet side and downwards by tilting the dispensing valve on the outlet side is movable up out of the valve seat. The valve body can be spherical, for example. With this configuration, the sensor line valve in the sensor line can be implemented in a particularly simple and thus cost-effective manner.

During refueling, the valve body is moved out of the valve seat due to the vacuum (possibly against the force of gravity). As soon as the liquid level reaches the end of the sensor line, it switches off automatically, no more gas is sucked in, so that the valve body falls back into the valve seat. Small amounts of fluid may get into the sensing line during the time it takes to shut down. If the end of the nozzle is then tilted upwards, for example when hanging the nozzle in a petrol pump, the valve body falls out of the valve so that the sensor line is opened and any residual fluid present can evaporate.

The subject matter of the invention is also an outlet pipe for a dispensing valve for dispensing a fluid, comprising an inlet end that can be connected to a housing of the dispensing valve, an inlet end opposite outlet end, and an anti-spill valve with a valve seat and a valve body that can be moved upstream into a closed position, characterized in that the valve body has a first part-body and a second part-body that is designed to be movable relative to the first, wherein a downstream movement of the first part-body relative to the valve seat of the outlet protection valve, a first fluid path can be opened and a second fluid path can be opened by a downstream movement of the second part-body relative to the first part-body, the outlet protection valve preferably being arranged at the inlet end of the outlet pipe.

The outlet pipe according to the invention can be further developed by further features which have already been described in connection with the nozzle according to the invention.

Figur 1:

ein erfindungsgemäßes Zapfventil in einer Querschnittsansicht;

Figur 2:

das erfindungsgemäße Auslaufrohr des Zapfventils der Figur 1 in einer vergrößerten Ansicht;

Figur 3:

eine vergrößerte Ansicht des in Figur 2 gezeigten Auslaufschutzventils in einer Schließstellung;

Figur 4:

eine vergrößerte Ansicht des in Figur 2 gezeigten Auslaufschutzventils in einer Öffnungsstellung;

Figur 5:

eine weitere Querschnittsansicht des Auslaufschutzventils des erfindungsgemäßen Zapfventils;

Figur 6:

eine Schnittansicht entlang der in Figur 5 gezeigten Linie A-A;

Figur 7:

eine Schnittansicht entlang der in Figur 5 gezeigten Linie B-B;

Figur 8:

eine vergrößerte Ansicht des in Figur 2 gezeigten Fühlerleitungsventils in einer Schließstellung;

Figur 9:

eine vergrößerte Ansicht des in Figur 2 gezeigten Fühlerleitungsventils in einer Öffnungsstellung bei nach unten geneigtem Auslaufrohr während der Fluidabgabe;

Figur 10:

eine vergrößerte Ansicht des in Figur 2 gezeigten Fühlerleitungsventils in einer Öffnungsstellung Schließstellung bei nach oben geneigtem Auslaufrohr;

Figur 11:

eine Grauwertskizze zur Illustration des innerhalb des Zapfventils im Bereich des Auslaufschutzventils herrschenden Fluiddrucks

Figur 12:

ein Auslaufschutzventil eines alternativen erfindungsgemäßen Zapfventils in einer seitlichen Schnittansicht in einer Schließstellung;

Figur 13:

das Auslaufschutzventil der Figur 12 in einer Öffnungsstellung.

In the following, advantageous embodiments are explained by way of example with reference to the attached drawings. Show it:

Figure 1:

a nozzle according to the invention in a cross-sectional view;

Figure 2:

the outlet pipe of the nozzle according to the invention figure 1 in an enlarged view;

Figure 3:

an enlarged view of the in figure 2 shown leakage protection valve in a closed position;

Figure 4:

an enlarged view of the in figure 2 shown leakage protection valve in an open position;

Figure 5:

another cross-sectional view of the leakage protection valve of the dispensing valve according to the invention;

Figure 6:

a sectional view along the in figure 5 shown line AA;

Figure 7:

a sectional view along the in figure 5 shown line BB;

Figure 8:

an enlarged view of the in figure 2 sensing line valve shown in a closed position;

Figure 9:

an enlarged view of the in figure 2 shown sensing line valve in an open position with the outlet pipe inclined downwards during fluid dispensing;

Figure 10:

an enlarged view of the in figure 2 sensor line valve shown in an open position, closed position with the outlet pipe inclined upwards;

Figure 11:

a gray value sketch to illustrate the fluid pressure prevailing within the dispensing valve in the area of the outlet protection valve

Figure 12:

a leakage protection valve of an alternative nozzle according to the invention in a side sectional view in a closed position;

Figure 13:

the anti-leakage valve figure 12 in an open position.

figure 1 shows a nozzle according to the invention in a side sectional view. The nozzle includes a in the figure 1 Housing 4 shown only schematically with an inlet opening 5 for connection to a liquid supply line. At the front end of the housing 4 an outlet pipe 10 is used, at the front end of which there is an outlet opening 12 . In addition, a control lever 6 is pivotably mounted on the housing 4, with which a main valve, not shown in the figure, can be actuated. The flow of a liquid supplied via the inlet opening through the dispensing valve is controlled via the main valve. Also located within the dispensing valve is an automatic shut-off device, not shown, which closes the main valve when a liquid level reaches or exceeds the front end of the outlet pipe during a fueling operation. For this purpose, the outlet pipe has a sensor line 24, which runs from the outlet end 12 to the automatic switch-off device.

figure 2 shows an enlarged side sectional view of the outlet pipe 10 of FIG figure 1 . In this view it can be seen that an outlet protection valve 13 according to the invention is arranged at the inlet end 11 of the outlet pipe 10 (in the region 9). It can also be seen that a sensor line valve 26 is located in an end region 25 of the sensor line 24 . The figures shown below show enlarged views of areas 9 and 25, which are used to explain the functioning of the outlet protection valve 13 and the sensor line valve 26 in more detail.

figure 3 shows an enlarged view of the in figure 2 shown area 9, in which a leakage protection valve 13 is arranged. figure 3 shows the leakage protection valve 13 in a closed position. The leakage protection valve 13 comprises a valve seat 14 and a valve body which is designed to close the valve seat 14 and has a first part-body 15 and a second part-body 16 . In the closed position shown, the first partial body 15 lies on the valve seat 14 sealing on. Within the first body part 15 there is a recess into which the second body part 16 is inserted. The first partial body 15 thus completely surrounds the second partial body 16 radially. In the closed position shown, a sealing surface 21 of the second part body 16 is in sealing contact with a counter-sealing surface 19 of the first part body 15 . The first part-body 15 thus forms a valve seat (or part-body valve seat) for the second part-body 16. In the in figure 3 In the state shown, the anti-drip valve is completely closed, so that any residual liquid that may be present cannot escape from the dispensing valve.

Rigidly connected to the valve seat 14 is a central shaft 29 which extends in the axial direction of the outlet protection valve and on which the second part body 16 is slidably guided. For this purpose, the second partial body 16 has a central through bore through which the shaft 29 is passed. The stem 29 defines an axial direction of the anti-leakage valve.

Also rigidly connected to the valve seat 14 is a registration plate 33 with registration openings 32. The first partial body 15 comprises at its inlet end four guide legs 30, of which in the sectional view of figure 3 only two are illustrated in the manner of a side view. The cutting plane of figure 3 does not pass through the guide legs 30. The guide legs 30 are each passed through one of the registration openings 32 in a sliding manner. The first partial body 15 is thereby linearly guided at its end on the inlet side. At its rear end, the first body part 15 comprises three guide webs 31. These are designed for sliding contact with an outer surface of the second body part 16 when the second body part 16 is moved relative to the first body part 15 downstream. The guidance of the partial bodies 15, 16 is also based on the Figures 5 to 7 explained in more detail.

In the present case, the second part body 16 is formed from a magnetic material. In addition, a counter-magnet body 23 is connected to the valve seat 14 . The counter-magnet body 23 is arranged symmetrically with respect to the axial direction specified by the shaft 29, as a result of which a uniform magnetic attraction force is exerted on the second partial body 16. The part body 16 is held in the closed position by this attraction force. At the same time, due to the contact of the sealing surface 21 of the second partial body 16 with the counter-sealing surface 19 of the first partial body 15, the partial body 16 transmits a force to the first partial body 15, which is thereby likewise pressed into the closed position. In alternative embodiments, a force effect for moving the second partial body into the closed position can also be generated by other devices, for example by means of a mechanical restoring element, in particular by means of a spring element.

figure 4 shows the outlet protection valve 13 in an open position. A transition from the in figure 3 The closed position shown in the open position can be done in particular by opening the main valve and passing through the main valve liquid flow. The liquid flow hits the inlet-side front surfaces of the first and second part-body 15, 16 and generates an opening pressure there that is sufficient to overcome the magnetic force acting between the counter-magnet body 23 and the second part-body 16 and both the first part-body 15 and the second part-body 16 to move downstream.

In figure 4 can be seen that opposite the in figure 3 shown closed position on the one hand the first partial body 15 relative to the valve seat 14 and on the other hand the second partial body 16 relative to the first partial body 15 have been moved downstream. The movement of the first partial body 15 relative to the valve seat 14 opens a first fluid path 17 . A second fluid path 18 is released by the movement of the second partial body 16 relative to the first. The flow of liquid impinging on the anti-leakage valve 13 can thus flow either along the first fluid path 17, which runs between an outer surface of the first part-body 15 and the valve seat 14, or along the second fluid path 18, which initially runs on the outside of the second part-body 16 and on the inside of the first part-body 15 passes and then runs through a passage opening 20 in the first body part 15 . The first fluid path 17 merges with the second fluid path 18 behind the passage opening. The additional second fluid path 18 allows the throughput through the outlet protection valve to be increased and the dynamic pressure in front of the valve to be reduced.

In alternative embodiments, it is possible to provide further fluid paths which can be released by a downstream movement of the first part body 15 relative to the valve seat 14 and/or by a downstream movement of the second part body 16 relative to the first part body 15.

In addition, within the scope of the invention, a further fluid path can be present, which runs through an intermediate space between an outer surface of the shaft 29 and an inner surface of the central through bore of the second partial body 16 and which is constantly open, regardless of the position of the partial bodies 15, 16. Such a gap between the outer surface of the shaft 29 and the inner surface of the central through hole may be required to allow sufficient mobility of the part body 16 relative to the shaft 29. In a preferred embodiment, however, the radial distance between the outer surface of the shaft 29 and the inner surface of the central through-bore is dimensioned so small that the capillary forces acting on the fluid in the intermediate space are sufficient to greatly reduce the leakage of the fluid through this intermediate space, and this is preferable to prevent completely.

In the Figures 3 and 4 It can be seen that the second partial body 16 tapers in cross-section starting from the sealing surface 21 in the direction upstream. In the region of the taper, the outer surface of the second partial body 16 is curved outwards in a first section 36 and inwards in a second section 35 arranged upstream thereof. Due to the curvatures in the area of the sections 35, 36, the liquid flowing along the second fluid path 18 is guided in the direction of the passage opening 20 in a flow-optimized manner.

In figure 4 the first and second partial bodies are in a maximum open position in which the partial bodies 15, 16 abut against a stop which limits the mobility of the partial bodies 15, 16 directed downstream. The stop is formed here, for example, by a sensor line plug 34, which is placed on one end of the sensor line 24, in which case the stop or stops can of course also be realized in other ways. The second partial body also remains in this maximum open position after the liquid has been dispensed, for example after the main valve has been closed. To this extent, the second partial body 16 is located outside of an effective area of the counter-magnetic body.

The gravitational force acting downstream in the position shown and the frictional forces caused by the sliding guide of the partial bodies are therefore in the position shown in total greater than the magnetic force of attraction between the second partial body 16 and the counter-magnetic body 23 leak out through the still open outlet protection valve 13.

Only when the dispensing valve (and thus the axial direction of the outlet protection valve 13) is inclined upwards on the outlet side can the relationship of forces reverse, so that the magnetic force is sufficient to move the second partial body 16 into the closed position. The sealing surface 21 of the second body part 16 meets the counter-sealing surface 19 of the first body part 15 and thus transmits a force to the first body part 15, which is thereby carried along into the closed position. The above-mentioned change in inclination, which leads to a closing of the anti-spill valve, can occur, for example, when a user removes the nozzle from a filler neck and subsequently hangs it in a gasoline pump. The closure of the leakage protection valve reliably prevents the leakage of residual amounts of liquid.

If, instead of the magnetic interaction between the second valve body 16 and the counter-magnet body, a mechanical restoring element is provided, which forces the second valve body into the closed position, it can also be provided in this case that the above-described relationship of forces can be reversed with the help of the inclination of the nozzle.

figure 5 shows another cross-sectional view of the in figure 2 shown area 9, with respect to the Figures 3 and 4 one another cutting plane was selected. The cutting plane runs in figure 5 by two guide webs 30 lying opposite one another in the transverse direction. The guide webs 31 on the outlet side cannot be seen in this view. In figure 5 two intersection lines AA and BB are drawn. figure 6 shows a sectional view along the section line AA and figure 7 shows a sectional view along the line BB. For illustration purposes in the Figures 6 and 7 other elements that are not actually recognizable in the sectional view are shown in the manner of a plan view.

In figure 6 it can be seen that the guide webs 31 of the first partial body 15 in figure 5 shown valve position on the outer periphery of the second part body 16 abut. The partial bodies 15, 16 are thereby guided against one another and stabilized relative to one another. In figure 7 it can be seen that the four inlet-side guide legs 30 of the first partial body 15 are slidably guided through the registration openings 32 . The registration openings 32 extend through the registration plate 33 connected to the valve seat 14.

The Figures 8 to 10 show enlarged views of the in figure 2 shown area 25, in which a sensor line valve 26 at the end of the sensor line 24 is arranged. The sensor line valve 26 comprises a valve body 27 which can be moved within the sensor line 24 and which is embodied as a ball in the present example. In addition, the sensor line valve includes a valve seat 28. Upstream of the valve seat 28 there is a blocking element 38 which limits the mobility of the valve body 27 but does not prevent gas exchange through the sensor line 24. The valve body 27 can move between the valve seat 28 and the blocking element 38 .

in the in figure 8 State shown, the valve body 27 is within the valve seat 28 and thus closes the sensor line 24 from. The valve body 27 is held in the valve seat 28 due to the downward inclination of the sensor line 24 on the outlet side. The main valve of the dispensing valve is closed in the state shown, no liquid is dispensed.

Upon opening the main valve, a vacuum is drawn within the sensing line 24 and air is drawn through the sensing line 24 in a manner known in the art. The gas flow is suitable for lifting the valve body 27 out of the valve seat 28 against the force of gravity. The valve body 27 is thereby pressed against the blocking element 37 . This state is in figure 9 shown.

When a liquid level reaches the outlet end 12 of the outlet pipe 10, an automatic switch-off takes place, no more gas is sucked in, so that the valve body falls back into the valve seat.

After a liquid has been dispensed, the dispensing valve is usually removed from a filler neck and hung, for example, in a petrol pump. As a result, the dispensing valve and the outlet pipe 10 are inclined upwards on the outlet side. Due to the force of gravity, the valve body 27 falls out of the valve seat 28 so that any residual amounts of liquid present in the sensor line 24 can evaporate.

figure 11 shows two gray scale sketches to illustrate the liquid pressure prevailing inside a dispensing valve in the area of a discharge protection valve. Light gray tones mean less pressure and darker gray tones mean less pressure higher pressure indicated. The pressure values were obtained by a mathematical simulation. The Figure 11A (above) shows the pressure conditions in a conventional anti-leakage valve known from the prior art, which has a one-piece valve body which is arranged in the area 40 . It can be seen that there is a significant increase in pressure in front of area 40 .

The Figure 11B shows the pressure conditions within a nozzle according to the invention in the area of the outlet protection valve 13. The outlet protection valve 13 and the other elements of the nozzle are not shown explicitly, but can be based on a comparison with the figure 4 the position of the respective elements (in particular the first partial body 15 and the second partial body 16) can be identified. The positions are in Figure 11B identified with the corresponding reference numbers. The outlet protection valve 13 is in the open state, in which the partial bodies 15, 16 release the fluid paths 17 and 18. A comparison of the gray values of illustrations A and B shows that a lower dynamic pressure is set in front of the outlet protection valve 13 according to the invention.

The Figures 12 and 13 show a spill protection valve of an alternative embodiment of a dispensing valve according to the invention in a side sectional view. In the figure 12 the anti-leakage valve is in a closed position and in figure 13 in an open position.

The alternate embodiment differs from the embodiment of FIG Figures 1 to 10 only by the design of the leakage protection valve. Therefore, only these differences from the embodiment of FIGS. 1 to 10 are described below.

In the alternative embodiment of Figures 12 and 13 the first partial body 15 includes an annular flat gasket element 15b and two partial body elements 15a and 15b. The part-body element 15a is connected to the downstream side of the flat gasket element 15b in such a way that a radially inner, downstream-facing sealing surface 15b1 is exposed, that is to say it is not covered by the part-body element 15a. The part-body element 15c is connected to the upstream side of the flat gasket element 15b in such a way that a radially outer, upstream-facing sealing surface 15b2 is exposed, that is to say it is not covered by the part-body element 15c. The sealing surfaces 15b1 and 15b2 are aligned approximately perpendicular to an axial direction of the anti-leakage valve.

In this embodiment, the second partial body 16 has a sealing surface 21' pointing upstream, which is designed for sealing contact with the sealing surface 15b1. In addition, the outlet protection valve in this embodiment has a valve seat 14', which is designed for sealing contact with the sealing surface 15b2.

The upstream and downstream sealing surfaces 15b1 and 15b2 of the flat gasket element 15b, which are essentially perpendicular to the axial direction of the outlet protection valve, can produce a particularly good sealing effect between the two partial bodies 15, 16 or between the first partial body 15 and the valve seat 14' become. At the same time, the partial body elements 15a and 15c serve to reduce the effects of the flat sealing element 15b on the flow of liquid when the outlet protection valve is in the open position. In particular, the partial body elements 15a, 15c guide the flow of liquid as advantageously as possible past the flat gasket element 15b. To this end, the partial body elements 15a, 15c taper in the axial direction (i.e. in the downstream direction and upstream), the outer surfaces of the sub-body elements 15a, 15c being curved inwards and outwards, respectively.

Claims (6)

A fluid dispensing nozzle comprising an inlet port (5) for connection to a fluid supply line, an outlet end (12) opposite the inlet port, a main valve for controlling fluid flow through the nozzle, the nozzle further having a nozzle extending to the outlet end (12). sensor line (24) which is in operative connection with an automatic switch-off device, a vacuum being applied to the sensor line (24) during the fluid delivery, so that a gas stream can be sucked in via the end of the sensor line (24), characterized in that the sensor line (24) has an end region (25) in which a sensor line valve (26) designed to close the sensor line (24) is arranged and which can be moved into an open position by means of the gas flow sucked in through the sensor line (24). The nozzle of claim 1, wherein the sensing line valve (26) is adapted to be moved downstream to the closed position by tilting the nozzle downwardly. The nozzle of claim 2, wherein movement to the closed position is by gravity. A dispensing valve according to any one of claims 1 to 3, wherein the sensing line valve (26) is biased to the closed position by a return member. A dispensing valve according to any one of claims 1 to 4, wherein the sensing line valve (26) includes a valve seat (28) and a valve body (27) movable within the sensing line (24) upstream of the valve seat (28). is arranged so that the valve body (27) can be moved downwards into the valve seat (28) on the outlet side by tilting the nozzle and can be moved upwards out of the valve seat (28) on the outlet side by tilting the nozzle. A dispensing valve according to claim 5, wherein the valve body (27) is spherical in shape.

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