Flow stop valve, in particular for a plug-in connection

Abstract

The present invention relates to a flow stop valve (14), in particular for a plug-in connection (1) for conducting coolant, the flow stop valve comprising: a valve plunger (24) that is axially movable in a flow channel (18, 20) of the plug-in connection (1) and sealingly cooperates with a valve seat (21); a head seal (29), that is mounted on a valve head (28) of the valve plunger (24), for fluid-tightly sealing the flow channel (18, 20); and a closing spring (16) that acts on one side on the valve plunger (24) and can be fixed on the other side in the flow channel (18, 20). In particular in order to improve the ease of assembly, according to the invention the valve plunger (24), that forms a single structural unit with the head seal (29) mounted on the valve head (28), is radially dimensioned and elastically deformable in such a way that an outer diameter that is effective during assembly is, in an undeformed state (DAG29, DAG33), greater than the diameter (DI6, DI40) of an assembly opening and, in the deformed state (DAM29, DAM33), is smaller than or equal to the diameter (DI6, DI40) of the assembly opening. The invention also relates to a plug-in connection (1) comprising such a flow stop valve (14).

Description

[0001] “Drain stop valve, in particular for a plug-in connection”

[0002] The invention relates to a discharge stop valve, in particular for a plug connection for the passage of cooling liquid, with a valve tappet which is axially movable in a flow channel of the plug connection and sealingly interacts with a valve seat, with a head seal arranged on a valve head of the valve tappet for fluid-tight closing of the flow channel and with a closing spring which acts on one side on the valve tappet and can be fixed on the other side in the flow channel.

[0003] O-rings are typically used as head seals, located in a groove in the valve head. The closing spring is either located behind the valve stem, which adversely affects flow and overall length, or the stem, including the closing spring, must be installed from one side during assembly, and the O-ring from the other.

[0004] Furthermore, the invention also relates to a plug connection with such a discharge stop valve.

[0005] A leak stop valve of the type mentioned at the outset is known from air conditioning technology, in particular from EP 0 568 076 B1, as an insert in a plug-in connection comprising a plug part and a coupling part. The plug-in connection is provided with two leak stop valves interacting in a flow channel of the plug part and the coupling part. Such a plug-in connection can be used, for example, for lines for the fluidic transport of a coolant. In detail, the known plug-in connection has a coupling part with a sleeve section and a plug part. The plug part can be inserted into the sleeve section of the coupling part by means of a shaft. The plug part can be locked or is locked in the coupling part in the inserted state by means of a holding element. Furthermore, a check valve is arranged in each of the plug part and the coupling part as a leak stop valve.The two check valves are designed and arranged in relation to the other check valve in such a way that the check valves open mutually when the connection is established or keep each other open when plugged in and locked, and are closed relative to the coupling part in a separated and / or pre-assembled state of the plug part. The closure of the check valves when the plug connection is disassembled is caused by the valve's closing spring. Each check valve has a valve tappet that is axially movable in a flow channel and cooperates sealingly with a valve seat. The valve tappets are arranged opposite one another along the flow channel in axial alignment such that their end faces abut against one another.To ensure fluid-tight closure of the check valve, the valve head of the valve stem has a head seal, and the valve seat has a correspondingly designed sealing surface. The valve seat can also be formed by a sleeve.

[0006] The arrangement of the check valves has the technical effect that no fluid can escape when the coupling part is released or separated from the plug part, in particular no coolant can leak out, since the closing spring is arranged on each valve head, which forces the respective check valve into its closed position when the plug connection is released. To seal, the valve head, with a particularly conical sealing surface, is pressed against the corresponding, particularly conical sealing surface of the valve seat in the flow channel by a restoring force of the closing spring.The present invention is based on the object of further improving a discharge stop valve of the type mentioned at the outset and a plug-in connection with such a discharge stop valve with regard to the disadvantages mentioned at the outset, in particular by requiring less assembly effort and being less susceptible to errors - with preferably low complexity.

[0007] This object is achieved according to the invention according to the features of claim 1 for the discharge stop valve in that the valve tappet is dimensioned radially and elastically deformable in a structural unit with the head gasket arranged on the valve head in such a way that an effective outer diameter during assembly in a non-deformed state is larger than the diameter of a mounting opening and in the deformed state is smaller than or equal to the diameter of the mounting opening.

[0008] The mounting opening can preferably be formed directly in the flow channel of the socket part, the plug part or in an insertion sleeve.

[0009] The technical measure according to the invention can, on the one hand, be implemented in a first embodiment on the base side of the valve tappet in that the valve tappet has arms which can be resiliently sprung radially inwards and which do not have to be fastened behind the valve spring, in particular on a locking edge of the valve or connector housing or on a locking edge on an insert in the valve housing, but can advantageously be fastened directly to the valve spring itself in that at least some of them are preferably designed as locking arms, wherein in a preferred embodiment they terminate in a locking hook at their free ends. The arms can, for example, be formed by a slit in an annular collar which projects radially from the valve tappet, as will be described in more detail below in connection with the second embodiment.The effective outer diameter during assembly is the largest outer diameter of a circumference of the annular collar projecting radially from the valve tappet around the radially elastically inwardly springable arms of the valve tappet.

[0010] According to the first embodiment of the invention, the head region of the valve tappet with the head gasket can remain unchanged compared to the known design or can be modified in a suitable manner. For example, the valve head can have at least one circumferential head gasket groove, which is preferably open radially toward the respective valve seat, so that a conventional annular head gasket can be or is arranged therein.

[0011] On the other hand, in a second embodiment, the technical measure according to the invention can be implemented on the head side of the valve tappet by providing the latter with an elastic head seal which, in particular, has an outer shape in the form of a truncated cone, a mushroom head, a spherical cap, a paraboloid of revolution or a similar hat-like body of revolution and an inner cavity for receiving the valve tappet.

[0012] The effective outer diameter during assembly is the largest outer diameter of the head gasket.

[0013] The base area of ​​the valve tappet can then remain unchanged compared to its known design or can also be modified, for example with regard to the design of abutting surfaces, at which the valve tappets abut one another in the plug-in connection, on an annular collar projecting radially from the valve tappet.

[0014] Specifically, it can be provided, for example, that the abutting surfaces are each formed on an annular collar projecting radially from the valve tappet, wherein the annular collar has a contact surface for the closing spring on the rear side of the abutting surface such that the respective closing springs are clamped against a restoring force between the respective contact surface and a clamping surface of the respective valve seat, at least in the inserted and locked state.

[0015] Such a design results in the closing springs being arranged relative to the respective valve tappet between the annular collar or the abutting surface and the valve head, whereby the valve head can advantageously be made smaller in diameter than the valve tappet in the area of ​​the annular collar or the abutting surface, so that the discharge stop valve can always be inserted into the flow channel of the coupling part or the plug part on one side.

[0016] In a preferred advantageous embodiment of the invention, the closing spring is designed as a helical spring such that it is arranged coaxially on the respective valve tappet. The closing spring expediently surrounds the valve tappet in such a way that the valve tappet forms an internal guide for the closing spring, thus preventing or largely limiting the breaking of the closing spring in the event of compression.

[0017] In a particularly advantageous variant, a spring guide can be formed by several, in particular four, webs evenly distributed around the circumference of the valve tappet. In the area of ​​the spring guide, the closing spring is thus forced into a coaxial position with the valve tappet. In particular, the closing spring rests on the spring guide, i.e., on the webs, surrounding the valve tappet.

[0018] According to the first embodiment, which has arms that can be resiliently flexed radially inwards, these arms can be designed to correspond to the slotting of the annular collar that projects radially from the valve tappet, analogous to the webs distributed around the circumference of the valve tappet, and can provide the spring guide. With regard to the second embodiment of the invention, the multi-component injection molding process in particular offers advantageous possibilities for producing the elastic head gasket, as this is a manufacturing process that can be used in plastics technology when injection-molded parts are to be made of two or more plastics. Completely different materials can also be advantageously combined. The term multi-component injection molding encompasses various processes in detail, for example the sandwich molding process and the overmolding process.In both cases, at least two different melts are combined.

[0019] While in the sandwich molding process, both melts are injected simultaneously, the German translation of "overmolding" means something like "overmolding," because in this case, a previously molded part made from a first melt is overmolded with a second melt during a subsequent process step. Depending on the selected plastics, this process can be used to produce so-called hard-soft joints. These usually consist of relatively hard plastics (here: the valve tappet) coated with a layer of elastic, relatively soft material (here: the head gasket).The machines used for the overmolding process are equipped with at least two independently controllable injection units, which—as well as the associated control system—can be designed specifically for a specific application. Thermoplastic elastomers (TPE) are particularly suitable as sealing materials for the multi-component injection molding process used for the overmolding process. Overmolding can be achieved, for example, with an EPDM-based TPE. A polymer sealing compound can also be applied to the valve tappet after it has been manufactured.

[0020] The starting material is cold-sprayed and then vulcanized to form the head gasket. However, both embodiments of the technical measure according to the invention can also advantageously be provided together in a structural unit of the valve tappet with the head gasket arranged on the valve head.

[0021] A plug connection according to the invention is characterized in that at least one, preferably two, discharge stop valve(s) according to the invention are mounted in it.

[0022] The invention advantageously allows for improved assembly while ensuring optimal overall length and high flow rates, preferably from only one side. In addition to cost-effective manufacturing and assembly, this also advantageously ensures high process reliability and a low risk of dirt ingress.

[0023] Furthermore, the invention also enables the respective discharge stop valve, complete with the valve seat formed by a plug-in sleeve, to be inserted in a modular manner into the flow channel of the plug part or the coupling part. In particular, the discharge stop valve according to the invention can thus be designed as a press-in cartridge and particularly preferably according to the identical part principle, which means that the same discharge stop valve, for example designed as a press-in cartridge, is used or can be used both in the plug part, if space permits, and in the coupling part. Thus, the discharge stop valves in the plug part and the coupling part are preferably designed identically.

[0024] The design according to the invention also expediently allows the coupling parts, the plug parts, and the drain stop valves to be manufactured as standard parts, whereby requirements to be met for the plug-in connection to be manufactured, such as flow rate or closing spring preload, are determined by a relative combination of the coupling part, the plug part, and the drain stop valves. The common part principle also has the major advantage over a design without common parts in that there is always a flow-technical balance between the two drain stop valves. Therefore, for example, no differences due to diverging flow paths need to be taken into account when designing the closing springs. The use of common parts is therefore particularly advantageous even with changing flow directions.

[0025] Furthermore, the invention takes into account the generally radially limited space requirement in the plug of a plug connection equipped with the inventive discharge stop valve. Thus, according to the inventive concept, the press-in cartridge described above can optionally be dispensed with, provided that the valve tappet with the seal and also the closing spring can be mounted directly in the plug. This minimizes both the number of required components and the assembly steps for a plug connection equipped with at least one, preferably two, discharge stop valves according to the invention, because many identical parts can be used for the plug and coupling.

[0026] An advantageous design of the sealing mechanism provides that the valve head has at least one circumferential head seal groove, which is designed to be open radially relative to the respective valve seat, so that a head seal, preferably an annular head seal, can be or is arranged therein. The head seal is advantageously designed such that the valve head is or can be sealed radially and axially against the sealing surface of the respective valve seat.

[0027] In the case of the second embodiment, the valve tappet can be completely covered by the elastic head gasket on the head side and protrude into the cavity of the gasket. Here, too, the head gasket groove or a similarly designed profile with preferably two head gasket grooves can contribute to the positive retention of the gasket. In both embodiments, the valve tappet can be designed as a hollow body, at least in part, particularly to save material.

[0028] To improve the function of the anti-leakage valves, particularly to prevent malfunctions, a special variant of the invention provides for the sealing surface at an end of one of the valve seats opposite the clamping surface to be conical, widening in diameter in the direction away from the clamping surface. Such a conical sealing surface advantageously allows the valve stem, in particular the valve head, to be guided more easily through the valve seat, preventing jamming.

[0029] According to an advantageous embodiment of the invention, the assembly or the

[0030] Insertion of the valve tappet into the flow channel, in particular into and / or through the valve seat, is improved in that at least one of the valve heads has a conical insertion section.

[0031] In the case that the elastic head gasket has an outer shape in the form of a truncated cone, a mushroom head, a spherical cap, a paraboloid of revolution or a similar hat-like body of revolution, which covers the valve head, such a conical converging insertion section is advantageously already completely provided by the elastic head gasket.

[0032] A particular advantage arises from the interaction with the head gasket. Advantageously, the respective discharge stop valve can be sealed fluid-tight by means of a sealing engagement of the head gasket formed on the valve head with the conical sealing surface of the valve seat. Furthermore, the conical sealing surface prevents damage to the discharge stop valve according to the invention, for example, due to shearing of the seal. When the discharge stop valve is moved from the open to the closed position, the head gasket is pressed axially and radially into the head gasket groove by means of the conical sealing surface, which improves the sealing properties. An increase in pressure within the flow channels advantageously reinforces the sealing potential of the respective discharge stop valve.

[0033] Further advantageous embodiments of the invention emerge from the following description of the figures and the dependent claims.

[0034] They show:

[0035] Fig. 1a an embodiment of an inventive

[0036] Plug-in device with a first embodiment of a discharge stop valve according to the invention in a three-dimensional exploded view,

[0037] Fig. 1 b is a further illustration of the embodiment according to Fig.

[0038] 1a in a three-dimensional exploded view,

[0039] Fig. 2 shows the first embodiment of an inventive

[0040] Three-dimensional exploded view of the leak stop valve together with a plug-in sleeve,

[0041] Fig. 3 shows the valve tappet of the first embodiment of a discharge stop valve according to the invention in a position rotated by 90° compared to Fig. 2,

[0042] Fig. 4 to 6 different assembly phases of the first embodiment of a discharge stop valve according to the invention shown in Fig. 2 in the plug-in sleeve,

[0043] Fig. 7 shows the first embodiment of an inventive

[0044] Leak stop valve at the beginning of assembly in a plug part, Fig. 8a and 8b the first embodiment of a leak stop valve according to the invention with compressed spring during two successive phases of assembly in the plug part,

[0045] Fig. 9 the first embodiment of an inventive

[0046] Leak stop valve after completion of assembly in the plug part,

[0047] Fig. 10 in longitudinal section, the embodiment of a plug-in device according to the invention shown in Fig. 1a in the assembled state with two open outlet stop valves according to the invention,

[0048] Fig. 11 in a representation as in Fig. 10, the one shown in Fig. 1a

[0049] Execution of a plug-in device according to the invention after pre-assembly or at the beginning of disassembly with two closed outlet stop valves according to the invention,

[0050] Fig. 12a shows an enlarged detail of a specially designed

[0051] Contact point of two discharge stop valves according to the invention in a plug-in device according to the invention,

[0052] Fig. 12b in a three-dimensional representation, similar to Fig. 2 and

[0053] 3, a valve tappet of a discharge stop valve according to the invention for a plug-in device according to the invention in a design according to Fig. 12a,

[0054] Fig. 13 and 14 a valve tappet seal unit of a second embodiment of a discharge stop valve according to the invention in two three-dimensional representations from different angles, Fig. 15 in exploded view and in longitudinal section, which in Fig. 13 and

[0055] 14 shows the valve tappet seal unit of the second embodiment of a leak stop valve according to the invention without a spring together with a plug-in sleeve,

[0056] Fig. 16 in longitudinal section, the embodiment of an inventive

[0057] Plug-in device with the second embodiment of a discharge stop valve according to the invention in the assembled state with two open discharge stop valves according to the invention,

[0058] Fig. 17 in a representation as in Fig. 10, the inventive

[0059] Plug-in device in the design according to Fig. 16, after pre-assembly or at the beginning of disassembly with two closed outlet stop valves according to the invention,

[0060] Fig. 18 and 19 an assembly phase of the second embodiment of a discharge stop valve according to the invention in a plug part,

[0061] Fig. 20 and 21 two representations of details of a plug device according to the invention with the second embodiment of a discharge stop valve according to the invention.

[0062] Figures 1a and 1b to 12a and 12b therefore relate to an exemplary embodiment of a plug-in device according to the invention in a first embodiment, and Figures 13 to 22 relate to an exemplary embodiment of a plug-in device according to the invention in a second embodiment. The significant difference between the two embodiments lies - as will be explained in detail below - in particular in the structural design of the respective discharge stop valve according to the invention, in particular of its valve tappet-seal unit. In the various figures of the drawing, identical parts are always provided with the same reference numerals and are therefore generally described only once - unless otherwise required.

[0063] With regard to the following description, it is claimed that the invention is not limited to the exemplary embodiments and not to all or several features of described combinations of features, but rather each individual partial feature of the / each exemplary embodiment is also important for the subject matter of the invention, even independently of all other partial features described in connection therewith, and also in combination with any features of another exemplary embodiment.

[0064] Fig. 1a shows a plug connection 1 according to the invention, which is particularly suitable for conducting coolant. The plug connection 1 comprises a coupling part 2 with a sleeve section 4 and a plug part 8 that can be inserted into the sleeve section 4 with a shaft 6. Accordingly, different states of the plug connection 1 with the plug part 8 inserted into the sleeve section 4 are shown, in particular in Figures 10 and 11.

[0065] The plug part 8 can be locked or is locked in the coupling part 2 in the inserted state by means of a multi-part holding device 12. The holding device 12 is expediently designed to be radially elastic and engages positively in an annular groove 10 of the plug part 8 for locking.

[0066] In Fig. 1a, the holding device 12 sits only on the coupling part 2 with the sleeve section 4. An arrangement of the holding device 12 on both the coupling part 2 and the plug part 8 is shown in Fig. 10 and 11, with Fig. 10 showing the locked state.

[0067] It is provided that a discharge stop valve 14 is formed in each of the plug part 8 and the coupling part 2 and arranged relative to the other discharge stop valve 14 in such a way that the discharge stop valves 14 open mutually when plugged in and locked. One discharge stop valve 14 is shown in Fig. 1a (right) in its individual components, and another (left) as a component of a valve package 15 designed as a press-in cartridge for the coupling part 2. The intended arrangement of the discharge stop valves 14, as intended for mutual interaction, can be seen in Figs. 10 and 11. Figures 4 to 6 show the assembly of the valve package 15.

[0068] Fig. 1b relates to the same design as Fig. 1a, although only the conditions at the plug part 6 (right side of Fig. 1a) are shown. The exploded view is slightly different from Fig. 1a in that it more clearly illustrates how the discharge stop valve 14 is mounted in the plug part 6, namely by introducing a closing spring 16 from one side and a valve tappet 24 from the other side. This is illustrated in more detail below using Figures 7 to 9.

[0069] The discharge stop valves 14 are closed in a separated and / or pre-assembled state of the plug part 8 relative to the coupling part 2, as shown in Fig. 11. It is provided that the closure of the discharge stop valves 14 is brought about and maintained by the closing spring 16.

[0070] As particularly illustrated in Figs. 7 to 11, both the coupling part 2 and the plug part 8 each have a flow channel 18, 20, each with a discharge stop valve 14 arranged in this flow channel 18, 20. Each of the two discharge stop valves 14 has a valve tappet 24 that is axially movable in the respective flow channel 18, 20 and sealingly interacts with a valve seat 21. The valve tappet 24 is also shown in its first particular embodiment—enlarged compared to Figs. 1a and 1b—as an individual part in Figs. 2 and 3.

[0071] When the plug part 8 is inserted into the coupling part 2, the valve tappets 24 of the two outlet stop valves 14 are arranged along the flow channel 18, 20 opposite one another with respect to the longitudinal axis XX, axially aligned in such a way that they abut one another at the end with abutting surfaces 26. It is intended that this mutual arrangement of the valve tappets 24 of the two outlet stop valves 14 is present both in the pre-assembly position, with an at least partially inserted shaft 6 of the plug part 8 in the sleeve section 4 of the coupling part 2 (Fig. 11), and in the fully inserted and locked state of the plug part 8 relative to the coupling part 2 (Fig. 10).

[0072] To close the discharge stop valve 14, the valve stem 24 is provided with a valve head 28. The valve head 28 has a head seal 29, for which the at least one circumferential head seal groove 27 is provided on the valve head 28 and opens radially outward toward the valve seat 21. A conically tapering insertion section 25 is arranged on the valve head 28.

[0073] A corresponding valve seat 21 has a correspondingly designed sealing surface, designated by the reference numeral 22. To close the check valve 14, the valve tappet 24 or the valve head 28 formed on the valve tappet 24 is axially movable relative to the respective flow channel 18, 20 such that the head seal 29 of the valve head 28 and the sealing surface 22 of the valve seat 21 can be transferred into a sealing position, whereby a fluid located in the flow channel 18, 20 cannot escape through the outlet stop valve 14 from the plug part 8 or from the coupling part 2.

[0074] In particular, Fig. 10 illustrates the inserted and locked state, i.e., the inserted arrangement of the plug part 8 with its shaft 6 in the socket section 4 of the coupling part 2, wherein the plug part 8 is simultaneously locked to the coupling part 2 by means of the holding device 12. The discharge stop valves 14 are open.

[0075] With regard to a pre-assembly state or a state at the beginning of disassembly, Fig. 11 instead shows that the plug connection 1 is partially separated, so that the locking by means of the holding device 12 is released and the plug part 8 with its shaft 6 is partially pulled out axially from the sleeve section 4 of the coupling part 2, but a residual section of the shaft 6 of the plug part 8 still remains in the sleeve section 4 of the coupling part 2.

[0076] Advantageously, the axial displacement of the plug part 8 from the fully inserted state into the partially inserted pre-assembled state is sufficient for the outlet stop valves 14 to assume their closed position and prevent fluid flow or fluid leakage from the respective flow channel 18, 20. An opening gap designated by the reference numeral 31 between the coupling part 2 and the plug part 8 can be seen in Fig. 11 in the plane of a main seal 30 arranged between the coupling part 2 and the plug part 8 (individual illustration of the main seal 30 also in Fig. 1).

[0077] According to the first embodiment of the invention, radially elastically inwardly resilient arms 33 are formed on the valve tappet 24. These arms are located on a circumference of an annular collar 34 interrupted by slots and projecting radially from the base of the valve tappet 24. The slots are designated by reference numeral 32 (for clarity, only in Figs. 3 and 12). The slots 32 advantageously allow a variable diameter of the annular collar 34.

[0078] In this way, in the first embodiment, the inventive concept can be realized in that the valve tappet 24 (in structural unit with the head seal 29 arranged on the valve head 28) is radially dimensioned and elastically deformable in such a way that an effective outer diameter during assembly in a non-deformed state is greater than the diameter of a mounting opening (Fig. 6) and in the deformed state is smaller than or equal to the diameter of the mounting opening (Fig. 4).

[0079] According to a particular embodiment, the valve seat 21 is formed in an insert sleeve 40, as shown by way of example in Figs. 2 to 6 as well as Figs. 10 and 11. Figs. 3 to 6 illustrate the assembly of the inventive discharge stop valve 14 in the insert sleeve 40 to form a valve assembly 15, as also shown in Fig. 1a. Figs. 10 and 11 (upper part) show how the insert sleeve 40, with the discharge stop valve 14 mounted therein, is mounted in the socket section 4 of the coupling part 2.

[0080] To assemble the discharge stop valve 14 according to the invention in the insertion sleeve 40, the arms 33 formed on the valve tappet 24 and resiliently springable radially inward are first pressed in the direction of the arrows designated by the reference symbol P in Fig. 4 - starting from a non-deformed state DAG33 of the outer diameter (Fig. 6), which is larger than the inner diameter DI40 of the assembly opening in the insertion sleeve 40 - to a deformed state DAM33 radially inward, where the outer diameter is smaller than or equal to the diameter DI40 of the assembly opening. Thus, the springable arms 33 formed on the valve tappet 24, which are pressed radially inward and elastically, can be guided in the axial assembly direction (arrow M) through the insertion sleeve 40 (Fig. 4) and also through the closing spring 16 (Fig. 5) until they then elastically spring back to the outer diameter in the non-deformed state DAG33 (Fig. 6), wherein the arms 33 engage behind the closing spring 16 in particular.As a result, the valve stem 24 is held in the insertion sleeve 40 on one side, while the other side is secured by the head seal 29 (Fig. 6) previously arranged on the valve head 28 (Fig. 4). The closing spring 16 rests on its side facing the valve head 28 against the valve seat 21 formed by the insertion sleeve 40, in which the mounting opening is also formed. A radially projecting contact surface 23 serves this purpose.

[0081] As also shown in particular in Figs. 4 to 6, the radially elastically inwardly springable arms 33 of the valve tappet 24 can, in a preferred embodiment, terminate at their free ends - as already mentioned - in locking hooks 36, which, on their side facing away from the abutment surface 26, not only provide a contact surface 37 for the closing spring 16, but can also be engaged with the closing spring 16. At least some of the radially elastically inwardly springable arms 33 of the valve tappet 24 are thus - in a particularly preferred embodiment - locking arms.

[0082] As shown in Figs. 7 to 9, the assembly of the discharge stop valve 14 according to the invention in the shaft 6 of a plug part 8 can be carried out analogously. For this purpose, the arms 33 formed on the valve tappet 24 and resiliently springable radially inward - starting from a non-deformed state DAG33 (Figs. 7, 9) of the outer diameter, which is larger than the inner diameter DI6 of the mounting opening in the shaft 6 - are pressed radially inward in the direction of the arrows designated by the reference symbol P in Fig. 7 to a deformed state where the outer diameter DAM33 (Figs. 8a and 8b) is smaller than or equal to the diameter DI6 of the mounting opening (and also smaller than or equal to the inner diameter of the closing spring 16 designed as a helical spring).Thus, the springable arms 33 formed on the valve tappet 24, which are pressed radially elastically inwards, can be guided in the axial assembly direction M through the valve seat 21 in the shaft 6 and also through the closing spring 16 (Fig. 8a and 8b) already placed in the shaft 6 (in the drawing above the valve seat 21), until they then spring back elastically to the outer diameter in the non-deformed basic state DAG33 (Fig. 9), wherein the arms 33 engage behind the closing spring 16 and preferably lock with it.

[0083] As a result, the valve tappet 24 is held on one side in the insert sleeve 40 mounted in the shaft 6, while on the other side it is fixed by the head seal 29 (Fig. 9) already arranged previously (Fig. 7) on the valve head 28, and the closing spring 16, on its side facing the valve head 28, is supported on a contact surface 23 on the valve seat 21. Figs. 10 and 11 (lower part) also show how the insert sleeve 40 with the discharge stop valve 14 mounted therein is mounted in the shaft 6 of the plug part 8.

[0084] In order to provide increased security in the locked state of the plug connection 1 according to the invention (Fig. 10), for example against clogging due to undesired dislocation of the parts contained therein, and in particular to prevent slipping of the valve tappet 24 in the axial direction XX after, for example, the abutting abutting surfaces 26 of the spring arms 33 rotate against each other so that the spring arms 33 of one discharge stop valve 14 engage in the slots 32 of the other discharge stop valve 14, further advantageous and technical measures can be implemented in the plug connection 1 according to the invention, which Fig. 12a and Fig. 12b explicitly illustrate.

[0085] Thus, as shown in Fig. 12a and Fig. 12b, wedge elements 50 arranged circumferentially alternately on the spring-loaded arms 33 on the valve tappet 24 can be provided, which form-fittingly prevent the valve tappets 24 of the two adjacent discharge stop valves 14 from rotating against each other by engaging in the slots 32 between the radially elastically inwardly spring-loaded arms 33 of the valve tappet 24 of the other discharge stop valve 14 and closing these slots 32 again at the end.

[0086] As Fig. 12b shows, in this embodiment - in contrast to the embodiment in Fig. 3 - there are only three spring-loaded arms 33, and these are also not designed as locking arms.

[0087] Finally, according to the invention, a fluid volume lost when opening a plug-in connection 1 according to the invention, i.e., a dead volume between the sealing areas that drips out after the connection is opened, can be minimized. Thus, axially extending recesses 38, 39 can be provided in the valve head 28 and / or in the plug-in sleeve 40, opening in particular against the flow direction of the fluid, as shown in particular in Figs. 4 to 6, but also in Figs. 10 and 11. These recesses 38, 39 serve to minimize material waste and prevent undesirable material accumulations. Such material accumulations would cause the respective part to warp upon cooling. The fluid volume collecting in these recesses 38, 39 when the fluid flows in - either from the side of the coupling part 2 with the sleeve section 4 or from the side of the plug part 8 - can - at least when the conditions shown in Fig.10 and 11—does not drip out if the recesses 38, 39 are located on the "wet" side, i.e., the fluid inflow side. On the other hand, recesses would instead increase the dead volume. Even when a plug connection 1 according to the invention is not installed vertically, the effect of capillary forces in the recesses 38, 39 minimizes lost fluid volume.

[0088] The embodiment of a plug-in device according to the invention shown in Figures 13 to 21 in a second embodiment has - apart from the features of the outlet stop valve 14 - the same basic structure as the embodiment of a plug-in device according to the invention shown in the first embodiment in Figures 1a and 1b.

[0089] The plug connection 1 comprises a coupling part 2 with a socket section 4 and a plug part 8 that can be inserted into the socket section 4 with a shaft 6. Accordingly, different states of the plug connection 1 with the plug part 8 inserted into the socket section 4 are shown in particular in Figures 16 and 17. As these figures also illustrate, the plug part 8 can be locked or is locked in the coupling part 2 in the inserted state by means of a multi-part holding device 12. Advantageously—as in the first embodiment—the holding device 12 is radially elastic and engages positively in the annular groove 10 of the plug part 8 for locking (Fig. 16).

[0090] As in the first embodiment, a discharge stop valve 14 is provided in each of the plug part 8 and the coupling part 2 and is arranged in relation to the other discharge stop valve 14 in such a way that the discharge stop valves 14 open mutually when plugged in and locked. The discharge stop valve 14 of the second embodiment differs from a discharge stop valve 14 as shown in its individual components in Fig. 1a (right) by the features explained below, in particular with reference to Figs. 13 to 15. This second embodiment of the discharge stop valve 14 can - just as shown in Fig. 1a (left) - be part of a valve package 15 designed as a press-in cartridge for the coupling part 2.

[0091] The arrangement of the discharge stop valves 14 to one another, as they are intended for mutual interaction, can be seen from Figs. 16 and 17.

[0092] Fig. 18 and 19 show by way of example the special assembly phase of the second embodiment of the discharge stop valve 14 in a plug part 8, which is characteristic of the invention.

[0093] The discharge stop valves 14 in the plug part 8 and the coupling part 2 are closed in a separated and / or pre-assembled state of the plug part 8 relative to the coupling part 2, as shown in Fig. 16. It is provided that the closure of the discharge stop valves 14 is brought about and maintained by a closing spring 16.

[0094] As shown particularly in Figs. 7 to 11, both the coupling part 2 and the plug part 8 each have a flow channel 18, 20, each with a discharge stop valve 14 arranged in this flow channel 18, 20. Each of the two discharge stop valves 14 has a valve tappet 24 that is axially movable in the respective flow channel 18, 20 and sealingly interacts with a valve seat 21. The valve tappet 24 is also shown in various views as an individual part in Figs. 13 to 15.

[0095] When the plug part 8 is inserted into the coupling part 2, the valve tappets 24 of the two discharge stop valves 14 are arranged along the flow channel 18, 20, opposite one another, axially aligned with respect to the longitudinal axis XX, such that they abut one another at the end faces with abutting surfaces 26. It is intended that this mutual arrangement of the valve tappets 24 of the two discharge stop valves 14 is present both in the pre-assembly position, with an at least partially inserted shaft 6 of the plug part 8 into the sleeve section 4 of the coupling part 2 (Fig. 17), and in the fully inserted and locked state of the plug part 8 relative to the coupling part 2 (Fig. 16).

[0096] To close the discharge stop valve 14, the valve stem 24 is provided with a valve head 28. The valve head 28 has a head seal 29. The corresponding valve seat 21 has a sealing surface designated by the reference numeral 22. To close the check valve 14, the valve stem 24 or the valve head 28 formed on the valve stem 24 is axially movable relative to the respective flow channel 18, 20 such that the head seal 29 of the valve head 28 and the sealing surface 22 of the valve seat 21 can be transferred into a sealing position.

[0097] In particular, Fig. 16—as well as Fig. 10 for the first embodiment—illustrates the inserted and locked state, i.e., the inserted arrangement of the plug part 8 with its shaft 6 in the socket section 4 of the coupling part 2, wherein the plug part 8 is simultaneously locked to the coupling part 2 by means of the holding device 12. The discharge stop valves 14 are open.

[0098] With regard to a pre-assembly state or a state at the beginning of disassembly, Fig. 17 - as well as Fig. 11 for the first embodiment - instead shows that the plug connection 1 is partially separated, so that the locking by means of the holding device 12 is released and the plug part 8 with its shaft 6 is partially pulled out axially from the sleeve section 4 of the coupling part 2, but a residual section of the shaft 6 of the plug part 8 still remains in the sleeve section 4 of the coupling part 2.

[0099] Conveniently, the axial displacement of the plug part 8 from the fully inserted state to the partially inserted pre-assembled state is sufficient for the outlet stop valves 14 to assume their closed position and prevent fluid flow or fluid leakage from the respective flow channel 18, 20. A stroke designated by the reference symbol H between the coupling part 2 and the plug part 8 can be seen in Fig. 17 to the side of the closing springs 16.

[0100] In contrast to the first embodiment of the invention, no radially elastically inwardly resilient arms 33 are formed on the valve tappet 24. Instead, the annular collar 34, which protrudes radially from the base of the valve tappet 24 and has the abutting surfaces 26, is unprotected, thus having a closed circumferential contour. The abutting surfaces 26 of two complementary discharge valves 14 according to the invention can thus fully abut one another in the assembled state. Therefore, a wedge element 50, as shown as optionally present in Fig. 12a and Fig. 12b for the first embodiment, is not necessary in a plug-in connection according to the invention.

[0101] The closing spring 16 is in turn designed as a helical spring such that it is arranged coaxially on the respective valve tappet 24. It surrounds the valve tappet 24, with the valve tappet forming an inner guide for the closing spring, so that the breaking of the closing spring 14 in the event of compression is prevented or limited. In this case, the spring guide—analogous to the spring-loaded arms 33 of the first embodiment—can be realized by several, in particular four, webs 41 evenly distributed over the circumference of the valve tappet 24, on which the closing spring 16 rests, surrounding the valve tappet 24.

[0102] In the second embodiment, the inventive concept that the valve tappet 24 (in structural unit with the head seal 29 arranged on the valve head 28) is radially dimensioned and elastically deformable in such a way that an effective outer diameter during assembly in a non-deformed state is greater than the diameter of a mounting opening and in the deformed state is smaller than or equal to the diameter of the mounting opening, is realized by the design of the head ring seal 29. In this regard, particular reference is made to Fig. 15 and Figs. 18 to 20. First of all, however, it should be noted that in the second embodiment, according to a special embodiment, the valve seat 21 can also be formed in an insert sleeve 40, as shown by way of example in Fig. 15 as an individual part and in Figs. 16 and 17 in the upper part and also in Fig. 21 in a state mounted in the sleeve section 4 of the coupling part 2.

[0103] The installation of the inventive discharge stop valve 14 in the shaft 6 of a plug part 8 is just as possible in the second embodiment as in the first embodiment, for which reference is made in particular to Figs. 18 and 19. The installation in a plug-in sleeve 40 and directly in the plug part 8 is carried out analogously to one another.

[0104] It is characteristic of the second embodiment that the valve tappet 24 is provided on its valve head 28 with an elastic head seal 29, which in particular has an outer shape in the form of a truncated cone, a mushroom head, a spherical cap, a paraboloid of revolution or a similar hat-like body of revolution and an inner (not further designated) cavity for receiving the valve tappet 24, in particular its valve head 28.

[0105] The conical insertion section 25 on the valve head 28 mentioned in the first embodiment is formed by the elastic head seal 29.

[0106] As already mentioned, the elastic head gasket 29 can preferably be manufactured with the valve tappet 24 in a multi-component injection molding process, wherein a thermoplastic elastomer (TPE) is preferably used for the head gasket 29, thus achieving the aforementioned advantages. In this case, the "soft" elastic head gasket 29 is adhesively bonded to the valve head 28, which is made of a non-elastic "hard" plastic material. However, this can be further supported by a form-fitting arrangement in that - as in the first embodiment - at least one (two in the exemplary embodiment) circumferential head gasket groove(s) or similar other retaining structures are formed on the valve head 28.

[0107] Particularly in the case of two head gasket grooves, it is possible to achieve the best possible interlocking of the soft and hard components by optimizing their geometry, in particular their respective groove depth and width, as well as their spacing from one another and the height of the wall between them, with regard to the hold of the seal 29 on the valve head 28 and with regard to the high deformability in one direction required during assembly and then the low deformability in the other direction required in the assembled state. This can also prevent migration of the soft and hard components against each other in the long term.

[0108] The effective outer diameter during assembly of the second embodiment is the largest diameter of the elastic head gasket 29. This can be seen in a non-deformed state, as it exists before and after assembly, in Fig. 13 to 17 and Fig. 20 and is designated by the reference symbol DAG29. The largest diameter DAG29 of the elastic head gasket 29 in the non-deformed state is larger than the diameter DI40 of the assembly opening of the insert sleeve 40 (Fig. 15 to 17) and also larger than the diameter DI40 of the assembly opening of the insert sleeve 40 (Fig. 15 to 17) and also larger than the diameter DI6 of the assembly opening in the shaft 6 of the plug part 8 (Fig. 16 and 17). The assembly opening is located - as in the first embodiment - in the valve seat 21.

[0109] In the deformed state, as it exists immediately during assembly, which is shown in Fig. 18 and 19 for the plug part 8, but these figures are also representative of an assembly in the insertion sleeve 40, the largest diameter DAM29 of the elastic head seal 29 in the deformed state is smaller than or equal to the diameter of the assembly opening DI6 (and also DI40 in the case of the insertion sleeve 40).

[0110] When the assembly unit comprising valve tappet 24 and head gasket 29, on which the closing spring 16 which can be mounted from the seal side is already positioned, is pushed into the valve seat 21, the head gasket 29 deforms elastically in the direction of the arrows P due to the wedge effect which is exerted on the essentially conical outer shape of the head gasket 29 by the force applied for assembly M upon entry into the assembly opening. The diameter reduction (DAG29 to DAM29) of the gasket 29 is preferably carried out by bending a rim section 42 which bears against the outer contour of the valve head 28 during assembly M. In particular, the dimensioning of the material thickness of the rim section 42 can advantageously influence the level of force which must be applied for assembly M.

[0111] For example, a wider groove in the vicinity of the rim section 42, which is filled by the soft component, compared to the other groove in the area of ​​the tip of the valve head 28, as shown, causes the material of the rim section 42 to be easily displaced into a free space radially above the groove during the deformation taking place for assembly M.

[0112] Instead, the other groove in the region of the tip of the valve head 28 can be narrower but deeper than the groove in the vicinity of the rim section 42, for example in the sense of a firm connection between the seal 29 and the head 28, as shown.

[0113] After assembly, the maximum diameter DAG29, which has returned to its undeformed state and is preferably formed on the flange section 42 of the head gasket 29, acts in a form-fitting manner like a barb and prevents the head gasket 29 from moving backward through the assembly opening. Bending of the flange section 42 in the direction opposite to the bend during assembly M is not possible, so that system pressures can also be maintained. In particular, the hard component of the wall located between the grooves, together with the soft component in the groove in the vicinity of the flange section 42, forms a block that counteracts seal deformation.

[0114] In addition, the valve tappet 24 is held by the closing spring 16, which can expand after assembly and which is clamped between the contact surface 37 on the valve tappet 24 on the one hand and the contact surface 23 on the valve seat 21 on the other hand.

[0115] A particular advantage of the second embodiment of the discharge stop valve 14 according to the invention is that it can be mounted completely from one side in a socket section 4 of a coupling part 2 or in a plug part 8.

[0116] The invention is not limited to the illustrated and described embodiments, but also encompasses all equivalent embodiments within the meaning of the invention. It is expressly emphasized that the embodiments are not limited to all features in combination; rather, each individual sub-feature can also have inventive significance independently of all other sub-features. For example, the two embodiments of the plug-in valve 14 according to the invention can be used together in a plug-in connection 1 according to the invention.

[0117] Furthermore, the invention is not yet limited to the feature combinations defined in the independent claims, but can also be defined by any other combination of specific features from all of the individual features disclosed overall. This means that, in principle, virtually any individual feature of the independent claims can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. The skilled person can also add further useful technical features within the scope of the claims without departing from the scope of the invention.

[0118] For example, as can be seen in particular from Fig. 20, the sealing surface 22 of the valve seat 21 can be conical and / or stepped in the sense of pre-centering the valve head 28, in particular of the head gasket 29 located there.

[0119] For example, as shown in Figs. 2 and 15, the outer peripheral surface of the insertion sleeve 40 can be given a contour 60 which, as shown, is particularly suitable for holding and sealing in the flow channel 18 / 20 of the coupling part 2 with the socket section 4 and / or the plug part 8, particularly due to the presence of grooves and teeth. For example, an annular seal 46 can be placed at this location, as shown in Figs. 16 and 17.

[0120] Finally, it has not yet been mentioned that the insertion sleeve 40 forming a valve seat 21 is preferably arranged in the respective flow channel 18, 20 such that the valve seat 21 is axially supported, at least when the plug part 8 is inserted and locked in the coupling part 2, on a stepped surface, which is formed in particular perpendicular to the flow channel 18, 20 and is formed in an inner circumferential surface of the flow channel 18, 20. Such stepped surfaces are identified by reference numeral 45 in Figs. 10 and 11 as well as Figs. 16 and 17 in the sleeve section 4.

[0121] Fig. 21 further illustrates that, through the structural design of the plug connection 1 according to the invention, in particular of axial lengths of the coupling part 2 with the sleeve section 4, optionally of the insert part 40 and / or the plug part 8, a plug-in path W of the plug shaft 6 in the sleeve section 4 can be provided, as well as preferably also a path limitation WB for the axial movement of the adjoining (Figs. 10, 16) or spaced apart (Figs. 11, 17) outlet stop valves 14 in the plug connection 1 according to the invention. For example, the end faces of the sleeve section 4, insert part 40 and / or plug shaft 6 can serve as stops for the contact surfaces 36 of the valve tappet 24 for the closing springs 16.The general advantage of such a stop is that for the compressed state, i.e. when the connection is plugged in, the remaining axial play caused by stroke tolerances of the two plungers 24 under the influence of the flow forces no longer includes spring tolerances in the tolerance chain and is therefore better limited.

[0122] List of reference symbols

[0123] 1 plug connection

[0124] 2 coupling parts of 1

[0125] 4 socket section of 2

[0126] 6 shaft of 8

[0127] 8 plug part of 1

[0128] 10 ring groove of 8

[0129] 12 Holding device for 2, 8

[0130] 14 drain stop valve in 1

[0131] 15 valve package of 14 and 40

[0132] 16 closing springs of 14

[0133] 18 flow channel of 2

[0134] 20 flow channel of 8

[0135] 21 valve seat in 2 / 8

[0136] 22 sealing surface of 21 for 28

[0137] 23 investment area of ​​21 for 16

[0138] 24 valve tappets of 14

[0139] 25 insertion section on 28

[0140] 26 impact area of ​​24 for 14

[0141] 27 Head ring seal groove 28 for 29

[0142] 28 valve head of 14 (24)

[0143] 29 head gasket on 28

[0144] 30 main seal between 2 and 8

[0145] 31 Opening gap between 2 and 8 (Fig. 11 )

[0146] 32 slot in 34

[0147] 33 spring arms out of 24 (first version out of 14)

[0148] 34 ring collar on 24

[0149] 36 investment area of ​​24 for 16

[0150] 37 locking hooks on 33

[0151] 38 Recess in 28 39 Recess in 40

[0152] 40 Insert sleeve for 14

[0153] 41 bridges of 24 (second version of 14)

[0154] 42 Brim section of 29 with DAG29 (second version of 14)

[0155] 45 step area in 4 for 40

[0156] 46 ring seal around 40

[0157] 50 wedge element in 1 (Fig. 12a, 12b)

[0158] 60 contour of 40

[0159] DAG29 Outer diameter of 29 in undeformed state

[0160] DAM29 Outer diameter of 29 in deformed state

[0161] DAG33 Outer diameter of 33 in undeformed state

[0162] DAM33 Outer diameter of 33 in deformed state

[0163] DI40 Diameter mounting opening of 40

[0164] DI6 inner diameter of 6

[0165] H stroke between 2 and 8 (Fig. 17)

[0166] M Mounting direction from 24 in 40 / 6 (Fig. 4, 7, 18, 19)

[0167] P compression direction of 33 / 29 (Fig. 4, 7, 18, 19)

[0168] W Plug-in path for 6 in 4 (Fig. 21 )

[0169] WB path limitation for 14 in 1

[0170] XX Longitudinal axis of 2, 8, 14

Claims

Claims 1 . A discharge stop valve (14), in particular for a plug-in connection (1) for conducting cooling fluid, comprising a valve tappet (24) which is axially movable in a flow channel (18, 20) of the plug-in connection (1) and sealingly interacts with a valve seat (21), comprising a head seal (29) arranged on a valve head (28) of the valve tappet (24) for fluid-tightly closing the flow channel (18, 20), and comprising a closing spring (16) which acts on one side of the valve tappet (24) and can be fixed on the other side in the flow channel (18, 20), characterized in that the valve tappet (24), in structural unit with the head seal (29) arranged on the valve head (28), is radially dimensioned and elastically deformable in such a way that an effective outer diameter during assembly in a non-deformed state (DAG29, DAG33) is larger than the diameter (DI6, DI40). a mounting opening and in a deformed state (DAM29,DAM33) is less than or equal to the diameter (DI6, DI40) of the mounting hole., 2. Drain stop valve (14) according to claim 1, characterized in that an abutment surface (26) for a further drain stop valve (14) is formed on an annular collar (34) projecting radially from the valve tappet (24), wherein the annular collar (34), in particular on the rear side of the abutment surface (26), has a contact surface (36) for the closing spring (16) such that the closing spring (16) is braced against a restoring force between the respective contact surface (36) and a clamping surface (23) of the respective valve seat (21), at least in a state inserted and locked into a plug part (8) or coupling part (2) of a plug connection (1).

3. Outlet stop valve (14) according to claim 1 or 2, characterized in that the valve tappet (24) has several, preferably four, radially elastically inwardly springable arms (33), preferably locking arms.

4. Drain stop valve (14) according to one of claims 1 to 3, characterized in that the outer diameter effective during assembly is the largest outer diameter (DAG33, DAM33) of a circumference of a / the annular collar (34) projecting radially from the valve tappet (24) around the radially elastically inwardly springable arms (33) of the valve tappet (24), wherein the annular collar (34) has a slot (32).

5. Drain stop valve (14) according to one of claims 1 to 3, characterized in that the effective outer diameter during assembly is the largest outer diameter (DAG29, DAM29) of the head ring seal (29).

6. Drain stop valve (14) according to one of claims 1 to 5, characterized in that the valve head (28) is provided with an elastic head seal (29), preferably made of a thermoplastic elastomer, which has in particular an outer shape in the form of a truncated cone, a mushroom head, a spherical cap, a paraboloid of revolution or a similar hat-like rotary body and an inner cavity for receiving the valve tappet (24).

7. Leakage stop valve (14) according to claim 6, characterized in that a reduction of the outer diameter (DAG29) in the non-deformed state of the head gasket (29) to the diameter (DAM29) effective during assembly (M) in the deformed state is achieved by bending a rim section (42) of the head gasket (29), wherein the rim section (42) bears against an outer contour of the valve head (28).

8. Leakage stop valve (14) according to claim 6 or 7, characterized in that the head gasket (29) in the assembled state, even under the system pressure of the fluid, is prevented from moving back against the assembly direction (M) and from reducing the outer diameter (DAG29) from the non-deformed state of the head gasket (29) by a / the rim section (42) of the head gasket (29).

9. Outlet stop valve (14) according to one of claims 1 to 8, characterized in that the closing spring (16) is designed as a helical spring such that it is arranged coaxially on the respective valve tappet (24).

10. Outlet stop valve (14) according to one of claims 1 to 9, characterized in that a spring guide for the closing spring (16) is formed by the arms (33) which can be resiliently springed radially inwards or by webs (41) of the valve tappet (24) which are evenly distributed over the circumference.

11. Plug connection (1), in particular for the passage of coolant, comprising a coupling part (2) with a sleeve section (4) and a plug part (8) which can be inserted into the sleeve section (4) with a shaft (6), wherein the plug part (8) is locked in the coupling part (2) in the inserted state by means of a holding device (12), wherein a discharge stop valve (14) is designed in each of the plug part (8) and the coupling part (2) and is arranged relative to the other discharge stop valve (14) in such a way that the discharge stop valves (14) open mutually in the inserted and locked state and are closed in a separated and / or pre-assembled state of the plug part (8) relative to the coupling part (2) - due to a respective closing spring (16), wherein each discharge stop valve (14) a valve tappet (24) which is axially movable in a flow channel (18, 20) and sealingly interacts with a valve seat (21), wherein the valve tappets (24) are arranged axially aligned opposite one another along the flow channel (18, 20) in such a way that they abut one another at the end faces with abutting surfaces (26), wherein for fluid-tight closing of the check valve (14), a valve head (28) of the valve tappet (24) has a head seal (29) and the valve seat (21) has a correspondingly designed sealing surface (22), characterized in that at least one discharge stop valve (14) is a discharge stop valve (14) according to one of claims 1 to 10.

12. Plug connection (1) according to claim 11, characterized in that at least one valve seat (21) is designed as a plug-in sleeve (40) and is arranged in the respective flow channel (18, 20) in such a way that the valve seat (21) is axially supported at least in an inserted and locked state of the plug part (8) in the coupling part (2) on a stepped surface (45), which is designed in particular perpendicular to the flow channel (18, 20), and which is designed in an inner circumferential surface of the flow channel (18, 20).

13. Plug connection (1) according to claim 11 or 12, characterized in that a / the mounting opening for the outlet stop valve (14) is formed by a valve seat (21) in the flow channel (18, 20) of the sleeve section (4) of the coupling part (2), the shaft (6) of the plug part (8) or in a / the insertion sleeve (40).

14. Plug connection (1) according to one of claims 11 to 13, characterized in that by the constructive design of axial lengths of the coupling part (2) with the sleeve section (4), optionally of the insert part (40) and / or the plug part (8), a plug-over path (W) of the plug shaft (6) in the sleeve section (4) is provided, and preferably also a path limitation (WB) for the axial movement of the discharge stop valves (14) which are adjacent to one another or spaced apart from one another, wherein in particular the end faces of the sleeve section (4), insert part (40) and / or plug shaft (6) form stops for the contact surfaces (36) of the valve tappet (24) for the closing springs (16).

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