Valve device for flow limitation in plug-in connectors

Abstract

The invention relates to a valve device (7) for flow limitation in plug-in connectors (1) for fluid lines, the plug-in connector (1) extending along a longitudinal axis (L) and comprising a connection-piece housing (2) which encloses a fluid channel (8) and through which a fluid can flow, wherein the connection-piece housing (2) has a sleeve portion (4) for receiving and fluidically connecting a line connection piece and has a connection-piece portion (5) which axially adjoins the sleeve portion (4) and has a passage opening (9), wherein the sleeve portion (4) is provided with at least one securing element (3) for detachably securing the connection-piece housing (2) to a line connection piece. According to the invention, it is provided that the plug-in connector (1) comprises a valve device (7), which is mounted with the ability to axially move selectively between a blocking position (SP) and an open position (FP) in order to block and open up the passage opening (9), wherein the valve device (7) is located in the connection-piece portion (5) of the connection-piece housing (2).

Description

[0001] Valve device for flow limitation in connectors

[0002] The invention relates to a valve device for flow limitation in connectors of fluid lines according to the preamble of claim 1.

[0003] For example, in the automotive industry, the utility and chemical industries or in ventilation technology, it is regularly necessary to connect pipes, hoses, line or connection pieces or other fluid lines in a hermetically or fluid-tight and fluid-communicating manner.

[0004] In fluid technology, line connectors or so-called plug-in connectors are used to adapt various connections (hose / pipe transitions, cross-section reducers) in a fluid power system. The fluid lines are connected via a type of connecting piece using the plug-in connectors or line connectors, thus creating a fluid-tight connection for the passage or forwarding of fluids or for blocking a fluid outlet. Multiple plug-in connectors can be arranged in a cascade to extend or redirect a line.

[0005] For this purpose, the connectors typically have a sleeve-shaped section for receiving a connecting piece of another connector. On the other hand, the connectors are also provided with a piece of the connecting piece for insertion and locking into a sleeve section of another connector.

[0006] Depending on the application, it may be desirable to block fluid systems or fluid channels to prevent a medium stored in the fluid system from flowing out. This can be done, for example, in the field of electromobility and drive technology during the transport of electronic components such as electrical machines, HV accumulators, battery thermal management systems (e.g. coolant circuit, etc.) using a valve device (flow limiting valve). The valve device closes the desired fluid channel and seals it off to the outside, preventing the medium from flowing out. Once transport is complete, the valve device or connector is no longer required and can be disassembled accordingly, or the valve device can be moved back into a release position to release the medium.

[0007] DE 102016 122 506 A1, for example, describes such a flow-limiting valve that can be used to block a fluid channel. For this purpose, a type of cage structure is provided that is implemented in the channel.

[0008] The main disadvantage of this, and of known flow limiting valves or valve devices for fluid lines in general, is often their relatively large, complex, and expensive design. However, standard connectors offer very little installation space, particularly in the area of ​​their connecting pieces or connecting pieces, and have relatively small channel diameters. Furthermore, in some cases, moving the valve from the blocking to the release position is difficult to access. As in the transport example of electronic components described above, many connectors and flow limiting valves are designed for single use during transport and are subsequently dismantled immediately after transport.

[0009] The aim of the invention is therefore to overcome these and other disadvantages of the prior art and to provide an improved valve device for flow limitation in connectors of fluid lines that can be manufactured with little effort and cost-effectively. Furthermore, the valve device should be largely universally applicable, particularly for standard connectors with relatively small dimensions and channel diameters.

[0010] Main features of the invention are defined in the characterizing part of claim 1. Further embodiments are the subject of further claims 2 to 14.

[0011] In a valve device for flow limitation in plug-in connectors of fluid lines, wherein the plug-in connector extends along a longitudinal axis and comprises a nozzle housing enclosing a fluid channel for the passage of a fluid, wherein the nozzle housing has a sleeve section for receiving and fluid-communicatingly connecting a line nozzle and a nozzle section axially adjoining the sleeve section and having a passage opening, wherein the sleeve section is provided with at least one securing element for releasably securing the nozzle housing to a line nozzle, the invention provides that the plug-in connector has a valve device which is mounted so as to be axially movable between a blocking position and a release position for blocking and releasing the passage opening, wherein the valve device is arranged in the nozzle section of the nozzle housing.

[0012] Due to the valve device according to the invention, which is dimensioned and designed in such a way that it is or can be positioned directly in the nozzle section of the plug connector, a particularly compact valve device is created which can be implemented particularly easily in standard plug connectors with relatively small fluid channel diameters.

[0013] According to a preferred embodiment of the invention, the valve device can have at least one spring element for axially moving the valve device between the blocking and release positions, wherein the spring element is arranged in the nozzle section of the nozzle housing. The spring element has proven to be a particularly cost-effective and effective means of implementing the desired axial movement of the valve device between the blocking and release positions. Due to the principle, the spring element and the inherent preload force of the spring element can advantageously exert an axial load on the valve device in the initial position or in the blocking position. The spring load supports the desired mechanism and facilitates flow limitation. In order to move the valve device into the release position, the preload force orthe spring loading or spring force that holds the valve device in the locking position must be overcome.

[0014] According to a further preferred embodiment, the valve device can be designed modularly, wherein the valve device has at least one first valve element facing the passage opening and at least one axially opposite second valve element facing the sleeve section. The modularity and two-part design of the valve element makes the valve device particularly compact in the region of the passage opening and the connecting piece section, because only the first valve element can be moved into the blocking and release positions. The second valve element can thus advantageously be axially fixed and provide a counter element for the spring element.Preferably, the spring element can be arranged between the at least two valve elements and acting along the longitudinal axis, wherein the intermediate spring element presses the first valve element axially away from the second valve element in the direction of the passage opening and the blocking position to limit the flow. It is preferred that the first valve element can be moved axially between the blocking and release positions, wherein the second valve element is axially fixed in the nozzle housing and cannot move. Further preferably, the spring element can be a helical spring, wherein the helical spring can bear against the valve elements with both end faces. The helical spring has proven to be a particularly cost-effective and effective means for implementing the desired axial movement of the first valve element.The coil spring can advantageously rest with one end face against the second valve element axially fixed in the connecting piece section, and with the opposite end face, push the first valve element into the locking position. Advantageously, the first valve element can only be moved from the locking position to the release position by a greater axial force counteracting the spring force.

[0015] Further preferably, the second valve element can have a radial elevation for axially securing the second valve element. Preferably, the radial elevation of the second valve element can engage in an annular groove provided for this purpose in the nozzle housing and axially secure the second valve element. This method has proven particularly favorable and effective for axially securing the second valve element, thereby advantageously further reducing manufacturing costs and complexity. Both the annular groove of the nozzle housing and the radial, annular elevation of the second valve element can be formed by simple turning and milling.

[0016] According to a further preferred embodiment, it can be provided that the at least two valve elements each have a base body, wherein the base bodies of the two valve elements are substantially cylindrical and are shaped to fit the fluid channel in the nozzle section. This further improves the compactness of the valve device. A diameter of the fluid channel in the nozzle section thus substantially corresponds to an outer diameter or an outer dimension of the base body. Preferably, the first valve element is somewhat smaller in order to avoid radial contact with the nozzle housing. This ensures a smooth and uniform axial movement between the blocking and release positions.According to a further advantageous embodiment, the invention can provide that the sleeve portion and the nozzle portion of the nozzle housing comprise fluid channel diameters of different sizes, wherein the fluid channel diameter of the sleeve portion is larger than a fluid channel diameter of the nozzle portion. This significantly simplifies the insertion of a nozzle portion into the sleeve portion of a connector. At the same time, the passage opening is advantageously reduced due to the smaller fluid channel diameter in the nozzle portion.

[0017] Advantageously, the at least two valve elements can have mutually facing end faces, wherein the mutually facing end faces of the valve elements are designed to be complementary to one another. The complementary design of the end faces supports the provision of a uniform fluid flow in the nozzle section of the nozzle housing. The end faces can preferably be provided with complementary recesses or notches. For example, the end face of the first valve element can have a central recess, whereas the second valve element can have outer recesses, so that both elements are shaped to one another and the end faces can theoretically engage with one another or bear against one another at maximum counterforce. An axial distance can preferably be provided between the end faces in the release position.Overall, this reduces the friction surfaces and reduces wear on the valve device.

[0018] According to a further preferred embodiment, it can be provided that the end face of the first valve element is pressed axially toward the end face of the second valve element when the valve device is moved into the release position, such that the passage opening of the nozzle housing is open in the release position of the valve device and fluid can flow out. The axial mobility of the first valve element relative to the nozzle housing ensures and supports the actuation of the first valve element between the blocking and release positions. As a result, the passage opening can be opened in a simple manner by applying a corresponding axial counterforce to the first valve element to release the fluid.

[0019] Preferably, the at least two valve elements can have axial extensions facing away from one another, wherein the axial extension of the first valve element is designed to be complementary to the passage opening. This supports a secure and complete closing and opening or release of the passage opening of the nozzle housing when the first valve element is moved between the blocking and release positions. According to a further preferred embodiment, the axial extension of the first valve element can close and protrude through the passage opening in the blocking position, such that the axial extension protrudes axially from the nozzle housing in the blocking position. This measure makes it visually apparent from the outside whether the first valve element is in the blocking position and additionally supports a complete closure of the passage opening.Preferably, the axial extension of the second valve element can extend axially into the sleeve portion of the connector housing. This allows the axial extension of the second valve element to move, for example, the first valve element of another connector inserted into the sleeve portion from the locking position to the release position. The axial extension of the second valve element can also have advantageous effects on the assembly / disassembly of the second valve element in the connector housing.

[0020] Further preferably, the axial extension of the first valve element can have a front-side recess for receiving a tool or pin and for actuating the first valve element. The recess is preferably formed on the front side in the axially projecting axial extension. Preferably, a suitable element, such as the axial extension of the second valve element, can be inserted into the recess of the first valve element in order to press and move the first valve element axially from the locked position into the release position. This allows the first valve element to be released on request by inserting a suitable tool element into the recess of the axially projecting extension and pressing the first valve element axially towards the second valve element and spring element.

[0021] It is particularly preferred that the recess is not continuous, but in the form of a blind hole. The axial extensions of the valve elements can preferably be cylindrical and have a smaller diameter than their base bodies, which are designed to complement the fluid channel. Further preferably, the axial extension of the second valve element can have an even smaller diameter than the axial extension of the first valve element, wherein the recess of the first valve element can be designed to complement the axial extension of the second valve element. This advantageously additionally supports the use of the axial extension of the second valve element as an actuating tool, which can be inserted into the recess of the axial extension of the first valve element. This also simplifies the cascading of multiple connectors.Preferably, the recess has a larger diameter than the axial extension of the second valve element, wherein the axial extension of the second valve element can be inserted axially into the recess.

[0022] According to a further preferred embodiment of the invention, the axial extension of the first valve element can have a groove in the transition region to the base body, in which groove a sealing element is arranged, wherein the sealing element is pressed against a contact surface of the nozzle housing in the blocking position. This achieves a secure, fluid-tight position when the passage opening is closed in the blocking position. By pressing the sealing element via the first valve element onto the contact surface provided for this purpose, the surface pressure in the region of the contact surface is also significantly increased because the contact surface of a relatively small sealing element is smaller than the contact surface of the entire base body of the first valve element. Overall, this advantageously results in a completely hermetically sealed plug-in connector in the blocking position.In addition, due to the reduction of contact to the sealing element and the contact surface, friction surfaces and thus the wear of the first, movable valve element are reduced overall.

[0023] Preferably, in the blocking position of the valve device, an axial distance can be arranged between the base body of the first valve element and the nozzle housing, wherein the sealing element can be designed, in particular, as a sealing ring. This distance reduces the friction and contact surfaces and simultaneously ensures earlier onset of resistance via the sealing element when closing the passage opening and moving into the blocking position. Overall, this reduces wear on the first valve element and further increases and concentrates the surface pressure in the area of ​​the seal.

[0024] According to a further preferred embodiment, it can be provided that the at least two valve elements each have passages for conducting a fluid through the fluid channel and through the passage opening, wherein the passages of the two valve elements are designed to be substantially complementary to one another. The complementary design improves the flow conditions and flow values ​​when flowing through the passages of the valve device. Because the first valve element is moved axially toward the second valve element when moving from the blocking position to the release position, the end faces and passages of the valve elements approach each other axially. The complementary design ensures a safe and even flow of the fluid.

[0025] Preferably, the passages of the two valve elements can each have an identical radial distance from the longitudinal axis of the connector, wherein the passages of the first valve element, in the release position, can be moved toward the passages of the second valve element and arranged relative to them in such a way that a virtually uninterrupted common passage is created. Otherwise, flow separation could occur due to sharp edges or the like, which in turn could result in local flow accelerations, turbulence, and pressure peaks. This measure significantly counteracts this and ensures uninterrupted and largely uniform flow through the connector.

[0026] Further preferably, the passages of the valve elements can have a symmetrical flow cross-section. The symmetrical design of the passage cross-sections greatly simplifies the production of the passages. At the same time, this measure also improves the flow values.

[0027] In a further aspect, the invention relates to a connector for fluidly communicating connection of fluid lines with a valve device according to the invention for flow limitation.

[0028] Further features, details, and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. They show:

[0029] Fig. 1 is a schematic sectional view of a connector according to the invention with a valve device in the locking position;

[0030] Fig. 2a is a schematic sectional view of a connector according to the invention with a valve device in the release position and with the extension inserted;

[0031] Fig. 2b is a perspective view of an open connector according to the invention with a valve device in the release position. The connector, generally designated 1 in Fig. 1, extends along its longitudinal axis L and has a support housing 2 that encloses a fluid channel 8. For the passage of fluids, the fluid channel 8 extends in the axial direction A through the entire nozzle housing 2 of the connector 1.

[0032] The nozzle housing 2 has a sleeve section 4 for receiving and fluidly connecting a line nozzle (not shown). Axially adjoining the sleeve section 4 is a nozzle section 5 with a through-opening 9. The sleeve section 4 is provided with a securing element 3, which can be rotatably and reversibly fixed to a line nozzle inserted into the sleeve section 4 of the nozzle housing 2 via a locking mechanism. The line nozzle (not shown) can essentially have the same shape as the nozzle section 5 shown.

[0033] The sleeve section 4 and the nozzle section 5 of the nozzle housing 2 have different channel diameters. In the area of ​​the securing element 3, the sleeve section 4 comprises a large fluid channel diameter D, which tapers toward the passage opening 9 and the nozzle section 5, initially into a medium fluid channel diameter D' and subsequently into a small fluid channel diameter d.

[0034] At the transition from the large fluid channel diameter D to the medium fluid channel diameter D', a sealing ring 6 is arranged and seals the nozzle housing 2 against a line nozzle inserted into the sleeve section 4.

[0035] The connector 1 has a valve device 7, which is mounted in the connecting piece section 5 for axially movable movement between a blocking position SP and a release position FP for blocking and releasing the passage opening 9. The valve device 7 is shown in Fig. 1 in the blocking position SP and closes the passage opening 9, thus preventing fluid from flowing out of the connector 1.

[0036] For this purpose, the valve device 7 is designed as a modular two-part assembly. To block and release the passage opening 9, the valve device 7 is arranged in the nozzle section 5 of the nozzle housing 2. The valve device 7 comprises a first valve element 10 facing the passage opening 9 and an axially opposite second valve element 20 facing the sleeve section 4. To axially move the valve device 7 between the blocking and release positions SP, FP, the valve device 7 also has a helical spring 30 arranged between the first and second valve elements 10, 20. The end faces of the helical spring 30 bear against the valve elements 10, 20 and press the first valve element 10 into the blocking position SP to tightly block the passage opening 9.

[0037] The second valve element 20 has a protrusion 23 that extends in the radial direction R and engages a corresponding groove in the nozzle housing 2. This fixes the second valve element 20 in the nozzle section 5. Due to the radial protrusion 23, the second valve element 20 cannot be moved in the axial direction A by the coil spring 30 and thus provides the coil spring 30 with an axial support surface.

[0038] The first valve element 10, however, is positioned axially movable in the nozzle section 5 and can be moved axially by the action of the coil spring 30. To tightly limit the flow and block the passage opening 9, the coil spring 30 presses the first valve element 10 axially toward the passage opening 9 and the blocking position SP.

[0039] The valve elements 10, 20 each comprise base bodies 11, 21, which are essentially cylindrical in shape. The end faces of the helical spring 30 each rest in the region of the base bodies 11, 21 of the valve elements 10, 20. The shape of the base bodies 11, 21 on their outer circumferential surfaces is adapted to the fluid channel 8 in the nozzle section 5. The valve elements 10, 20 have mutually facing end faces 14, 24, wherein the mutually facing end faces 14, 24 of the first and second valve elements 10, 20 are complementary to one another.

[0040] The valve elements 10, 20 also have axial extensions 15, 25 facing away from one another, wherein the axial extension 15 of the first valve element 10 is designed to complement the passage opening 9. The axial extensions 15, 25 of the valve elements 10, 20 are cylindrical and have a smaller diameter than the base bodies 11, 21, which are designed to complement the fluid channel 8. The axial extension 25 of the second valve element 20 has an even smaller diameter than the axial extension 15 of the first valve element 10.

[0041] The axial extension 15 of the first valve element 10 has a groove 17 in the transition area to the base body 11, in which a sealing ring 16 is arranged. In the locking position SP, the sealing ring 16 is pressed against a contact surface 16' of the nozzle housing 2 and seals the through-opening 9 to the outside.

[0042] In the blocking position SP of the valve device 7, an axial distance 13 is arranged between the base body 11 of the first valve element 10 and the nozzle housing 2. The axial extension 15 of the first valve element 10 extends through and closes the passage opening 9 in the blocking position SP, such that the axial extension 15 protrudes axially from the nozzle housing 2.

[0043] The axial extension 15 of the first valve element 10 also has a front-side recess 19 for receiving a suitable counter-element and actuating the first valve element 10 in the axial direction A. The recess 19 is formed on the front side in the axially projecting extension 15 of the first valve element 10.

[0044] The axial extension 25 of the second valve element 20 extends axially into the sleeve section 4 of the nozzle housing 2 in a direction opposite to the axial extension 15 of the first valve element 10.

[0045] The recess 19 does not extend through the entire base body 11 of the first valve element 10, but is designed in the form of a blind hole, as shown in particular in Fig. 1 by way of example.

[0046] By referring to Fig. 2a, it becomes clear that the end face 14 of the first valve element 10 is pressed axially toward the end face 24 of the second valve element 20 when moving into the release position FP, such that the passage opening 9 of the nozzle housing 2 is open in the release position FP of the valve device 7 and fluid can flow out. In this position, the helical spring 30 is axially compressed because the first valve element 10 is pressed with its base body 11 against the adjacent end face of the helical spring 30. The compression of the helical spring 30 is not shown in Figs. 2a and 2b.

[0047] By way of example, Fig. 2a shows another connector T with a sleeve and socket section 4, 5. Only a second valve element 20 is provided in the socket section 5, identical to that in the connector 1, and axially fixed to the socket housing 2. A first valve element or a spring element is not arranged in the other connector 1'. The axial extension 25 projects axially into the sleeve section 4 of the other connector 1'.

[0048] The connecting piece section 5 of the connector 1 is inserted into the sleeve section 4 of the further connector 1' up to the second valve element 20 of the further connector T, so that the axial extension 25 of the further connector 1' engages the recess 19 of the first valve element 10 and presses the first valve element 10 axially from the blocking position SP into the release position FP. In Figs. 2a and 2b, the first valve element 10 and thus the valve device 7 are shown in the release position FP.

[0049] The recess 19 of the first valve element 10 is designed to complement the axial extensions 25 of the second valve elements 20 of the connectors 1, 1'. The recess 19 has a slightly larger diameter than the axial extensions 25 of the second valve elements 20.

[0050] As can be seen particularly in Fig. 2b, the valve elements 10, 20 each have passages 12, 22 for conducting a fluid through the fluid channel 8 and through the passage opening 9. The passages 12, 22 of the two valve elements 10, 20 are essentially complementary to one another and form a cross shape. The passages 12, 22 of the valve elements 10, 20 comprise a symmetrical flow cross-section.

[0051] The passages 12, 22 of the two valve elements 10, 20 are arranged at the same height and have an identical radial distance from the longitudinal axis L of the connector 1. In the release position FP of the valve device 7, the passages 12 of the first valve element 10 are moved toward and brought closer to the passages 22 of the second valve element 20 in such a way that a virtually uninterrupted common passage is created and the fluid can flow out.

[0052] The invention and the valve device according to the invention are not limited to the previously described embodiments, but can be modified in a variety of ways. The valve device according to the invention can be used in various fluid line systems and connectors. All features and advantages apparent from the claims, the description, and the drawings, including design details, spatial arrangements, and method steps, can be essential to the invention both individually and in a wide variety of combinations.

[0053] Reference symbol list

[0054] A Axial direction

[0055] R Radial direction

[0056] L Longitudinal axis

[0057] SP locking position

[0058] FP release position

[0059] D large fluid channel diameter (sleeve section)

[0060] D' average fluid channel diameter (sleeve section) d small fluid channel diameter (nozzle section)

[0061] 1 connector

[0062] 1' additional connector

[0063] 2 nozzle housings

[0064] 3 Securing element

[0065] 4 sleeve section

[0066] 5 nozzle section

[0067] 6 Sealing element (sealing ring)

[0068] 7 Valve device

[0069] 8 fluid channels (total connectors)

[0070] 9 Passage opening

[0071] 10 first valve element

[0072] 11 Basic body

[0073] 12 passages

[0074] 13 axial distance (housing-valve element in SP)

[0075] 14 Front side (first valve element)

[0076] 15 axial process

[0077] 16 Sealing element (sealing ring)

[0078] 16' contact surface (seal-nozzle housing)

[0079] 17 grooves

[0080] 19 Recess (pin holder)

[0081] 20 Second valve element

[0082] 21 basic body

[0083] 22 passages

[0084] 23 radial elevation

[0085] 24 Front side (second valve element) 25 axial extension

[0086] 30 Spring element (coil spring)

Claims

Patent claims 1. A valve device (7) for flow limitation in plug-in connectors (1) of fluid lines, wherein the plug-in connector (1) extends along a longitudinal axis (L) and comprises a nozzle housing (2) enclosing a fluid channel (8) for the passage of a fluid, wherein the nozzle housing (2) has a sleeve section (4) for receiving and fluid-communicatingly connecting a line nozzle and a nozzle section (5) axially adjoining the sleeve section (4) with a passage opening (9), wherein the sleeve section (4) is provided with at least one securing element (3) for releasably securing the nozzle housing (2) to a line nozzle, characterized in that the plug-in connector (1) has a valve device (7) which is mounted for axial movement between a blocking position (SP) and a release position (FP) for blocking and releasing the passage opening (9),wherein the valve device (7) is arranged in the nozzle section (5) of the nozzle housing (2)., 2. Valve device according to claim 1, characterized in that the valve device (7) has at least one spring element (30) for axially moving the valve device (7) between the blocking and release positions (SP, FP), wherein the spring element (30) is arranged in the nozzle section (5) of the nozzle housing (2).

3. Valve device according to claim 1 or 2, characterized in that the valve device (7) is of modular design, wherein the valve device (7) has at least one first valve element (10) facing the passage opening (9) and at least one axially opposite second valve element (20) facing the sleeve section (4).

4. Valve device according to claim 2 and 3, characterized in that the spring element (30) is arranged between the at least two valve elements (10, 20) and acting along the longitudinal axis (L), wherein the intermediate spring element (30) presses the first valve element (10) axially away from the second valve element (20) in the direction of the passage opening (9) and the blocking position (SP) in order to limit the flow.

5. Valve device according to claim 3 or 4, characterized in that the at least two valve elements (10, 20) each have a base body (11, 21), wherein the base bodies (11, 21) of the two valve elements (10, 20) are substantially cylindrical and are shaped to fit the fluid channel (8) in the nozzle section (5).

6. Valve device according to one of the preceding claims, characterized in that the sleeve section (4) and the nozzle section (5) of the nozzle housing (2) comprise fluid channel diameters (D, d) of different sizes, wherein the fluid channel diameter (D) of the sleeve section (4) is larger than a fluid channel diameter (d) of the nozzle section (5).

7. Valve device according to one of claims 3 to 6, characterized in that the at least two valve elements (10, 20) have mutually facing end faces (14, 24), wherein the mutually facing end faces (14, 24) of the valve elements (10, 20) are designed to be complementary to one another.

8. Valve device according to claim 7, characterized in that the end face (14) of the first valve element (10) is pressed axially in the direction of the end face (24) of the second valve element (20) when the valve device (7) is moved into the release position (FP), such that the passage opening (9) of the nozzle housing (2) is open in the release position (FP) of the valve device (7) and fluid can flow out.

9. Valve device according to one of claims 3 to 8, characterized in that the at least two valve elements (10, 20) have axial extensions (15, 25) facing away from one another, wherein the axial extension (15) of the first valve element (10) is designed to be complementary to the passage opening (9).

10. Valve device according to claim 9, characterized in that the axial extension (15) of the first valve element (10) closes and projects through the passage opening (9) in the blocking position (SP), such that the axial extension (15) projects axially out of the nozzle housing (2) in the blocking position (SP), and wherein the axial extension (25) of the second valve element (20) extends axially into the sleeve section (4) of the nozzle housing (2).

11. Valve device according to claim 9 or 10, characterized in that the axial extension (15) of the first valve element (10) has a groove (17) in the transition region to the base body (11), in which groove a sealing element (16) is arranged, wherein the sealing element (16) is pressed against a contact surface (16') of the nozzle housing (2) in the blocking position (SP).

12. Valve device according to one of claims 3 to 11, characterized in that the at least two valve elements (10, 20) each have passages (12, 22) for passing a fluid through the fluid channel (8) and through the passage opening (9), wherein the passages (12, 22) of the two valve elements (10, 20) are designed to be substantially complementary to one another.

13. Valve device according to claim 12, characterized in that the passages (12, 22) of the two valve elements (10, 20) each have an identical radial distance from the longitudinal axis (L) of the plug-in connector (1), wherein the passages (12) of the first valve element (10) in the release position (FP) are moved towards the passages (22) of the second valve element (20) and are arranged relative to these in such a way that a virtually uninterrupted common passage is created.

14. Connector (1) for fluidly connecting fluid lines to a valve device (7) for flow limitation according to one of the preceding claims 1 to 13.

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