Plug system having a plug connector and an adapter

Abstract

The invention relates to a plug system (1) having a plug connector (2) and an adapter (3), which can be connected to one another and disconnected again. The plug connector (2) comprises: a sleeve-type main part (4) having a through-hole (5); a plug-in pin (6) which can be inserted, at a first end, into the adapter (3); a connection end (7) for connecting to a line, the connection end being located at a second end opposite from the first end; a pressure-movable valve (8) which can be moved along a longitudinal axis of the plug connector (2) from a sealing position into an open position by a relative movement of the plug connector (2) and the adapter (3) and can be returned to the sealing position by a spring force. The adapter comprises: a sleeve-type main part (20) having a through-hole (21); a plugging region (22) for receiving the plug-in pin (6); and a pressure-movable valve (23) which can be moved along a longitudinal axis of the adapter (3) from a sealing position into an open position by a relative movement of the plug connector (2) and the adapter (3) and can be returned to the sealing position by a spring force.

Description

[0001] Plug-in system with one plug and one adapter

[0002] The invention relates to a plug-in system with a plug and an adapter, which can be connected and separated from each other and which each comprise a pressure-movable valve.

[0003] It is well known that plug-in connectors are used to detachably connect lines, such as pipes or hoses for hydraulic or pneumatic flow or pressure media. Connecting such lines to power units via plug-in connectors is also possible. Compared to screw connections, plug-in connectors offer the advantage of significantly simplifying the connection of lines, as a single action is all that's needed to connect a line, instead of the often laborious and time-consuming process of screwing it into sometimes hard-to-reach places.

[0004] A plug connection known from DE 10 2007 059 329 A1 has an inner part and an outer part that can be connected to and separated from each other. The inner part can be inserted into a receiving bore of the outer part by means of a plug-in pin and locked there via a holding element that can be deformed in the radial direction. A release sleeve is arranged on the plug-in pin and can be moved axially against the force of a spring element into an unlocked position, in which the holding element can be pushed out of the locked position and the plug-in pin can be released from the outer part. The release sleeve has a shoulder with a conical section that widens outwards counter to the plug-in direction and against which the spring element rests with radial preload. The spring element can be an O-ring made of elastomeric material, whereby the inner diameter of the O-ring in the relaxed state can be 10 to 30% smaller than the smallest outer diameter of the release sleeve.This allows the plug-in connection to be released with low axial force. In a plug-in connection known from EP 1 235 023 A1, a sealing section is arranged on the release sleeve. This sealing section consists of an elastomeric, thermoplastic polymer and is cast around a flange with a conical wall section of the release sleeve and is chemically bonded to the flange. The sealing section has an onion- or bell-shaped, radially inwardly inclined wall section, the front end of which rests against the outer part. When the plug-in connection is unlocked, the onion- or bell-shaped wall section is compressed by an axial force and folded radially inward into a recess so that the release sleeve can move into the unlocked position.

[0005] In a plug-in connection known from EP 0 932 789 B1, an annular spring element made of elastomeric material is arranged between an end face of the outer part and a shoulder of the release sleeve that is perpendicular to the longitudinal axis of the plug pin. This results in the spring element having to be deformed in the axial direction if the release sleeve is to be moved into the unlocking position. The deformation in the axial direction is associated with a relatively steep increase in the spring force of the spring element. Unlocking the plug-in connection therefore requires a relatively large force, which is considered disadvantageous.

[0006] The invention is based on the object of providing a plug-in system with which a secure and also tight plug connection can be produced.

[0007] The problem is solved by the features of claim 1. Preferred embodiments are formulated in the dependent claims.

[0008] A connector system is provided with a plug and an adapter that can be connected and disconnected. The plug has a sleeve-shaped base body with a through-hole. Its first end has a plug-in pin that can be inserted into the adapter, while the second, opposite end serves as the terminal end for connecting to a cable.

[0009] - In addition, the plug has a pressure-movable valve that can be moved along the longitudinal axis between a sealing position and an open position and is automatically returned to the sealing position by a spring force.

[0010] The adapter is also equipped with a sleeve-shaped base body with a through hole.

[0011] - It has a plug-in area designed to accommodate the plug pin of the connector.

[0012] - In addition, the adapter includes a pressure-movable valve which, analogous to the plug valve, can be moved along the longitudinal axis between a sealing position and an open position and is also returned to the sealing position by a spring force.

[0013] The proposed plug-in system offers a variety of advantages, particularly in terms of tightness, ease of use, and operational reliability. The pressure-operated valves in the plug and adapter ensure that the system seals automatically as soon as the connection is separated. This occurs through the automatic return of the valves to the sealing position using spring force, effectively preventing unwanted leakage. Another key feature is its quick and easy handling. Since the plug-in system enables tool-free assembly and disassembly, the components can be connected or disconnected by simply plugging and unplugging. The valve actuation occurs through the relative movement of the plug relative to the adapter, eliminating the need for additional mechanical control. Furthermore, the system increases operational reliability and control over the medium.The double seal in the connector and adapter ensures that no uncontrolled fluid leaks, even if one of the two components is separated. This is particularly advantageous for hydraulic and pneumatic applications where a leak-free connection is essential.

[0014] According to the invention, a connection between the through-bore of the adapter and the through-bore of the plug forms a fluid channel through which a fluid, for example a liquid, a gas, etc., can flow.

[0015] In a further development of the plug-in system, the plug is provided with a sealing device on its peripheral surface to ensure a fluid-tight connection with the adapter. This sealing device can be designed as an O-ring, sealing lip, or other elastic sealing structure and is positioned to form a secure and reliable seal when the plug is inserted into the adapter. This advantageous design ensures that no medium escapes uncontrollably and enables loss-free transmission of fluids or gases. The sealing device helps to minimize pressure losses by maintaining the sealing effect even under changing pressure conditions and temperature fluctuations. It also protects the connection from external influences such as dust or dirt particles, thereby extending the service life of the plug-in system.

[0016] It is advantageous if the connector includes a locking device to securely fix the plug pin in a locked position. This locking device can consist of locking elements that engage in corresponding recesses on the peripheral surface of the adapter when the connector is inserted into the adapter. This mechanical fixation prevents accidental release of the connector and ensures a stable connection between the connector and adapter. The locking mechanism also ensures that the axial position of the plug pin in the adapter is precisely maintained, thus ensuring the sealing function and the correct positioning of the fluid-carrying components. This design enables an easy-to-use, removable connection.

[0017] It is preferred that the locking device comprises at least one spring and / or a retaining ring. The spring can be arranged such that it presses the locking elements into the corresponding receptacles of the adapter, thus ensuring automatic locking when the plug is inserted. Alternatively or additionally, a retaining ring can be used to mechanically hold the locking elements in the locked position. This design ensures secure and reversible fixation of the plug in the adapter and prevents accidental loosening, thus enabling easy disassembly for maintenance or component replacement.

[0018] In one embodiment, the valve of the adapter consists of a valve head and a valve base, which are connected to each other via a central part. The central part establishes a mechanical connection between these two components. This design ensures improved control of the valve stroke and enables reliable movement of the valve between the sealing and open positions. It is preferred that the valve head of the adapter valve comprises a circumferential sealing surface. In this regard, the sealing head can have a circumferential groove into which a sealing means, such as an elastomer O-ring, is integrated.

[0019] It is particularly advantageous if the sealing surface of the valve head of the adapter valve is in sealing contact with a corresponding contact surface of the adapter base body in the sealing position of the plug-in system. The corresponding contact surface in the adapter base body is preferably arranged at a constriction in the base body, which is formed in particular by a diameter reduction. This advantageous design achieves reliable sealing of the adapter's through-bore, which functions as a fluid channel, in that the two surfaces form a flat, positive-locking connection when the valve is closed. This precise sealing geometry ensures that the medium cannot escape when the valve is in the sealing position, whereby the plug-in system has high pressure resistance and leak resistance.In particular, a sealing surface running all the way around the valve head can ensure uniform loading of the sealing surface.

[0020] In a further embodiment of the valve in the adapter, the valve comprises a sleeve that forms a contact surface for the sealing surface of the valve head and thus ensures a defined sealing position. To release the fluid flow, either the sleeve or the valve head can be moved relative to one another, with this movement occurring counter to the spring force of a spring element. This means that an external force, for example by inserting the plug, moves the valve from the sealing position to an open position, with either the sleeve or the valve head being movable. This design ensures controlled valve actuation, minimizes unwanted pressure losses, and ensures consistent flow release, thereby improving the performance and tightness of the plug-in system.

[0021] In one design version of the adapter sleeve, the sleeve can be press-fitted into the adapter, while the valve head remains movable relative to the sleeve. Press-fitting creates a positive and non-positive connection between the sleeve and the adapter housing. The mobility of the valve head relative to the sleeve enables controlled opening and closing of the valve, ensuring precise fluid control. This design helps ensure that the valve can be reliably switched between the sealing and open positions without the need for additional external fixation of the sleeve. In addition, the firm press-fitting of the sleeve into the adapter simplifies assembly, while the movable bearing of the valve head ensures consistent flow and reduced wear.

[0022] Alternatively, the valve base can be axially secured in the adapter's base body, while the sleeve is movable relative to the valve head. This design ensures that the valve base remains securely fixed within the adapter, guaranteeing precise guidance of the valve mechanism. The movable sleeve enables targeted control of the opening mechanism by moving from the sealed position to the open position in response to an external force, e.g., the plug or the fluid flow. This ensures that flow is only released when a defined relative movement occurs between the sleeve and the valve head.

[0023] It is preferred that the valve of the plug comprises a valve head and a valve base which are connected via a central part. This design enables precise control of the valve movement, as the valve head can be moved specifically between a sealing position and an open position. The central part serves as a mechanical connection between the valve head and valve base. This arrangement ensures that the valve of the plug reacts reliably to fluid pressure or mechanical influences and moves precisely into the intended sealing or flow position. The valve, in particular the valve head, central part and valve base of the adapter and / or the plug, can be manufactured from a single component. However, it can also be advantageous if the valve head, central part and valve base can be reversibly connected to one another via positive-locking connections, such as locking or snap-in connections.In a further advantageous embodiment, the valve head of the valve of the plug comprises a circumferential sealing surface. The valve head can have a circumferential groove extending radially along the outer surface or peripheral surface of the valve head, into which a sealing means, in particular an O-ring made of an elastomer, is inserted.

[0024] In one embodiment, it can be advantageous for the sealing surface of the valve head of the valve of the plug to be in sealing contact with a corresponding contact surface of the base body of the plug in the sealing position of the plug system. The corresponding contact surface in the base body of the plug is preferably arranged at a constriction in the base body, which is formed in particular by a diameter constriction. This arrangement ensures reliable sealing of the fluid channel in that the two surfaces form a positive and flat connection, thereby preventing unwanted media leakage. The advantageous design of the sealing surface of the valve head in combination with the corresponding contact surface of the base body creates an even pressure distribution that enables permanent and reliable sealing.

[0025] It is advantageous that the valve head of the plug valve can be moved linearly from its sealing position relative to the plug base along a longitudinal axis. This movement occurs counter to a spring force, ensuring that the valve head can be returned to the sealing position independently and in a controlled manner after the opening process. This design advantageously ensures reliable control of the fluid flow, as the valve is opened in a targeted manner by an external force, for example the applied pressure of the medium or mechanical actuation during insertion. The linear guide along the longitudinal axis ensures precise and low-friction movement of the valve head. In addition, the spring force ensures automatic sealing as soon as the external opening impulse is removed.Particularly in hydraulic and pneumatic applications, this design helps minimize pressure losses and ensure consistent flow. In a further embodiment of the invention, the valve base of the plug valve is supported by a spring element axially mounted in the base body. This design ensures a defined restoring force that reliably returns the valve head to the sealing position after actuation. The spring element can be designed, in particular, as a compression spring. The axial mounting of the spring element in the base body ensures that the spring force acts specifically on the valve base, enabling controlled and consistent movement of the valve head along its longitudinal axis. This contributes to low-friction valve actuation.

[0026] It can be advantageous to have guide ribs attached to the center section of the plug valve that extend radially to the longitudinal axis. These guide ribs serve to precisely guide the linear movement of the valve head along the longitudinal axis and prevent lateral tilting or uncontrolled movement of the valve within the plug. Multiple ribs spaced apart from one another can be advantageous. The radial arrangement of the ribs ensures that the valve stays exactly on its intended path even with large volume flows and that movement can occur smoothly and without lateral forces. In addition, the guide ribs enable uniform force transmission from the medium or spring to the valve, ensuring precise control of the opening and closing process.

[0027] In one embodiment, it is advantageous for the valve head of the adapter valve and / or the plug valve to have bores, in particular to ensure a constant flow cross-section. These bores are advantageously arranged so that the flow of the medium is not impaired even when the valve is fully open or partially closed. The targeted arrangement of the bores ensures that flow resistance is minimized and a uniform pressure distribution is achieved within the plug-in system. In addition, this embodiment can ensure that the valve continues to maintain a defined flow cross-section even at high flow velocities.

[0028] In a further embodiment, the adapter is arranged as a pre-assembled unit in a shaped bore of a unit. This design means that the adapter is directly integrated as a shaped bore into the housing structure of the unit, creating a space-saving and flow-optimized connection. Typical units into which the adapter can be integrated in the form of a shaped bore include, but are not limited to, hydraulic control blocks, pneumatic valve islands, pump housings, pressure control valves, or cooling circuits in thermal systems. This design enables a reduced number of individual components, as the adapter does not have to be installed as a separate component but functions as a permanently fitted unit. Direct integration into the unit increases the mechanical stability of the plug-in system, as there are fewer potential sealing points, thus minimizing the risk of leaks.Furthermore, simplified assembly and maintenance are possible, as the plug-in system can be integrated into existing system structures without additional connecting elements. This design contributes to optimizing installation space utilization and reducing assembly times, particularly in hydraulic and pneumatic applications.

[0029] The invention will be explained in more detail below with reference to exemplary embodiments of the invention, which are illustrated in the drawings.

[0030] Figures 1-3 show an exemplary plugging of a plug-in system with partial sectional views of the adapter and plug, Figures 4, 5 show an exemplary plugging of a further embodiment of a plug-in system with partial sectional views of the adapter and plug,

[0031] Figure 6 is a partial sectional view of a plug-in system with an embodiment of the adapter according to Figures 4, 5 as a shaped bore,

[0032] Figure 7,8 an exemplary plugging of a further embodiment of a plug-in system with partial sectional views of adapter and plug with holes in plug and adapter and,

[0033] Figure 9 is a partial sectional view of a plug-in system with an adapter design according to Figures 7, 8 as a shaped bore.

[0034] Figures 1-3 illustrate an example of plugging a plug-in system with partial sectional views of the adapter and plug. The plug-in system 1 comprises a plug 2 and an adapter 3, which can be reversibly connected to one another. The plug 2 has a sleeve-shaped base body 4 with a hollow cylindrical through-bore 5. At a first end of the plug 2 is the plug-in pin 6, which is designed for insertion into the adapter 3. A connection to a fluid line (not shown) can be established via a second end opposite the first end, which is referred to as the connection end 7 in the context of the invention. The connection end 7 can be designed accordingly for this purpose and have corresponding connections and connecting means. A valve 8 is arranged in the through-bore 5 of the plug 2. The valve 8 comprises, in particular, a valve head 9, a valve base 10, and a central part 11, which connects the valve head 9 to the valve base 10.The valve head 9 is designed as a disc-shaped element, from one side surface of which the cylindrical central part 11 extends axially along a longitudinal axis up to the valve base 10. The opposite side surface of the valve head 9, i.e. the side surface that projects towards the plug-in pin 6, can be flat and have a central receptacle or recess. Along its circumferential surface, a circumferential groove 12 is provided in the valve head 9, which accommodates a sealing means 13, such as an O-ring made of an elastomer. The diameter of the sealing means 13 is designed such that it projects at least partially beyond the circumferential surface of the valve head 9. The valve head 9 thus forms a sealing surface 14, which is in sealing contact with a corresponding contact surface 15 of the base body 4 of the plug 2 in a sealing position of the plug-in system 1.In the example shown, the contact surface 14 is formed by a constriction or diameter reduction of the through-bore 5, against which the sealing surface 14 formed by the valve head 9 rests.

[0035] In the illustrated embodiment, the valve base 10 is designed as a rod-shaped element having a smaller diameter than the central part 11. The free end of the valve base 10 is spread. The valve base 10 extends through an opening 16 of a support element 17 extending through the through-bore 5 transversely to the longitudinal axis. The support element shown

[0036] 17 may have wings extending diametrically from a central element, which are not visible in the selected view. However, there may also be several wings extending radially from the central element. Free ends of the support element 17, in particular the free ends of the wings

[0037] 18 are axially secured in the base body 4, so that axial displacement of the support element 17 is not possible. Below the support element 17, i.e., in the direction of the connection end 7, an O-ring or slotted O-ring is arranged in the through-bore 5 of the base body 4, which acts as an axial stop for the support element 17. The axial mobility of the valve foot 10 is limited by the spreading of the valve foot 10. On the one hand, the central part 11 adjacent to the valve foot 10 forms an axial stop, and on the other hand, the spreading itself, which has a larger diameter than the opening 16 in the support element 17, forms an axial stop. Due to this advantageous design, the valve 8 of the plug 2 can be moved axially along the longitudinal axis of the base body 4. The movement of the valve 8 towards the connection end 7 occurs against the spring force of a spring element 19.The valve 8 of the plug 2 comprises the spring element 19, which can be designed, for example, as a spiral compression spring. The spring element 19 is arranged between the valve head 9 and the support element 17. In the embodiment shown, the spring element 19 is not supported on the valve head 9, but rather on webs extending radially from the central part 11. There can be several webs, which are offset and spaced from one another along the circumference of the central part 11. In the embodiment shown, the webs and the support element 17 function as an axial stop for the spring element 19. However, it can also be provided that the spring element 19 is axially supported on a shoulder present in the central part 11 and on the support element 17.

[0038] The adapter 3 of the plug-in system has a sleeve-shaped base body 20 with a hollow cylindrical through-bore 21. A plug-in area

[0039] 22 of the base body 20 is provided for receiving the plug-in pin 6. The adapter 3 can be connected to a unit (not shown) via the end opposite the plug-in area 22. A valve is provided in the through-hole 21 and essentially in the plug-in area 22.

[0040] 23, which comprises a valve head 24, a valve base 25, and a central part 26, wherein the central part 26 connects the valve head 24 and the valve base 25 to one another. In the illustrated embodiment, the valve base 25 is axially secured by a support element 17, which is supported radially and axially in the through-bore 21 of the base body 20. For this purpose, the valve base 25 can, for example, have a circumferential groove designed to receive the support element 17. At least in the embodiment shown, an axial movement of the valve base 25 relative to the base body 20 is therefore not possible. The central part 26 adjoining the valve base 25 is rod-shaped and opens at the disc-shaped valve head 24. In the example, the valve head 24 is designed similarly to the valve head 9 of the valve 8 of the plug 2 and has a circumferential groove 12 on its peripheral surface, which accommodates a sealing means 13.This forms a sealing surface 27 of the adapter 3, which is in sealing contact with a corresponding contact surface 15 in a sealing position of the plug-in system 1. In the embodiment shown, the contact surface 15 is formed by a sleeve 27 that radially surrounds the valve 23. At its free end, which points towards the plug-in area 22, the sleeve 27 has a constriction that has a smaller diameter than the sleeve 27. This diameter constriction projects over a step towards the central axis of the base body 20 of the adapter 3, so that a gap 28 exists between the inner wall of the base body and the diameter constriction of the sleeve 27. A spring element 19 is arranged in the sleeve 27. The spring element 19 can be designed, for example, as a spiral compression spring. The spring element 19 is supported with one end on the support element 17 and with its second end on the step of the sleeve 27.As a result, the sleeve 27 can be moved axially toward the valve base 25 against a spring force of the spring element 19. In the sealing position of the adapter 3 and the plug 2, flow through the through-bores 5, 21 is prevented by the sealing surfaces 14 of the valves 8, 23, which, in the embodiment shown, form a sealing contact with the sleeve 27 in the adapter 3 and a sealing contact with the constriction in the base body 4 of the plug 2.

[0041] The plugging of the embodiment of the plug-in system 1 according to Figure 1 can be seen in Figures 2 and 3. The plug 2 is inserted with its plug-in pin 6 into the plug-in area 22 of the adapter 3. A free end of the plug-in pin 6 slides into the through-bore 21 of the adapter 3 and into the gap 28 of the sleeve 27. The sleeve 27 is thereby displaced axially against the spring force of the spring element 19. Since the sleeve 27 forms the contact surface for the sealing surface 14 of the valve head 24 of the adapter valve 23, the valve 23 moves from its sealing position to its open position. Sealing means can ensure a sealing engagement of the free end of the plug-in pin 6 with the gap 28 of the sleeve 27. At the same time, the forward movement of the plug pin 6 in the direction of the plug-in area 22 creates a basically axial operative contact between the valve head 24 of the adapter valve 23 and the valve head 9 of the plug valve 8.The valve head 24 of the adapter valve 23 is not movable and thus forms an axial stop for the valve head 9 of the plug valve 8, so that the plug valve 8 is moved from its sealing position to its open position. Both valves 8, 23, i.e. that of the adapter 3 and that of the plug 2, are open and a fluid can flow through the through-bores 5, 21. It can be advantageous if, for example, the plug 2 comprises a locking device 29 which locks the plug 2 in its plugged-in position. As an example, Figures 1-3 show a sliding sleeve 30 which surrounds the plug 2 and comprises locking elements 31 in the form of balls which, when the plug 2 is in the locking position, engage in correspondingly designed receptacles in the outer surface of the adapter 3.

[0042] The plug-in system 1 is essentially released in the reverse order. After releasing the locking device 29, the plug-in pin 6 can be pulled out of the plug-in area 22 of the adapter 3. The backward movement relaxes the spring element 19 of the sleeve 27 of the adapter 3 and presses the sleeve 27 back into the sealing position, in which the contact surface 15 of the sleeve 27 seals against the sealing surface 14 of the valve head 24. Furthermore, the axial operative contact between the valve head 24 of the adapter 3 and the valve head 9 of the plug 2 ends, so that the valve head 9 of the plug 2 is moved back into its sealing position, in which the sealing surface 14 of the valve head 9 seals against the contact surface 15 of the base body 4 of the plug 2.

[0043] Figures 4 and 5 illustrate an exemplary plugging of a further embodiment of a plug-in system 1 with partial sectional views of adapter 3 and plug 2. The valve 8 of the plug 2 comprises a valve head 9 and a valve base 10, which are connected to one another via a central part 11. The central part 11 is designed as a constriction that has a smaller diameter than the valve head 9 and the valve base 10. The valve base 10 is sleeve-shaped and accommodates the spring element 19. The base body 4 of this embodiment of the plug 2 is screwed to a further component 35, via which the connection to a line is possible. The sleeve-shaped valve base 10 can rest with its outer surface against the inner surface of the through-bore 5 of the plug 2. The spring element 19 is supported on the one hand by a shoulder present in the sleeve-shaped valve base 10 and on the other hand by a surface of the component 35.It can also be provided that the spring element 19 is supported on the valve base 10 and an edge of the base body 4 of the plug 2. The transition area between the central part 11 and the valve base 10 is bell-shaped or conical, which then merges into the sleeve-shaped valve base 10. Bores 32 are provided in the transition area between the central part 11 and the valve base 10. The bores 32 can run essentially perpendicular to the longitudinal axis of the plug 2. After the plug valve 8 has been moved into the open position, fluid can flow through the bores 32. For further details, please refer to the explanations for Figures 1 to 3.

[0044] Figure 6 shows a partial sectional view of a plug-in system 1 with an adapter 3 configured as a shaped bore according to Figures 4 and 5. According to the invention, the adapter 3 can also be configured as a shaped bore in an assembly 33. Components of the adapter 3, such as the valve 23, can be easily inserted into the shaped bore. In the example shown, the valve base 25 of the valve 23 is secured axially and radially in the adapter 3, in particular the shaped bore. The valve base 25 comprises a circumferential sleeve 27, which is secured in the shaped bore, for example, by press-fitting. The sleeve 27 serves as an axial stop for the spring element 19, which is preloaded between the sleeve 27 and a sleeve-shaped ring 34. The sleeve-shaped ring 34 forms a contact surface 15 for the sealing surface 14 of the valve head 24 of the adapter 3.When the plug pin 6 is inserted into the plug-in area 22 of the adapter 3, the free end of the plug pin 6 engages the sleeve-shaped ring 34 and moves it axially and against the spring force of the spring element 19 from the sealed position to the open position. The plug valve 8 opens as already described.

[0045] Figures 7-9 show an exemplary plugging of a further embodiment of a plug-in system 1 with partial sectional views of adapter 3 and plug 2 with bores 32 in plug 2 and adapter 3. The valve head 24 of the adapter 3, more precisely the sealing surface 14 of the valve head 24 of the adapter valve 23, lies sealingly against a contact surface 15 of the base body 20 of the adapter 3, which is formed by a constriction in the through-bore 21. The valve base 25 is sleeve-shaped or cylindrical and projects with its open end in the direction of the plug-in pin 6 to be inserted. The central part 26 has radial bores 32 that project into the valve base 25. Radial webs protrude from the outer surface of the valve base 25 in the direction of the inner circumferential surface of the through-bore 21 of the adapter 3. The radial webs form an axial stop for the spring element 19, which also bears axially against the constriction of the through-bore 21.The valve 8 of the plug 2 has a similar structure, with a sleeve-shaped or hollow-cylindrical valve base 10, the open end of which projects towards the adapter 3. The valve head 9, which projects towards the connection end 7, rests with its sealing surface 14 on contact surfaces 15 of the base body 4. The sealing surface 14 is followed by a conical section which runs at a distance from a correspondingly designed area of ​​the base body 4. This is followed by a free end of the valve head 9, which comprises radial bores 32, i.e. bores 32 aligned in particular perpendicular to the axially extending longitudinal axis of the plug 2. The base body 4 of this embodiment of the plug 2 has an enlarged diameter in the connection end 7. In addition, in this embodiment, a further component 35 is screwed to the connection end 7, via which component the connection to a line is possible.The spring element 19 is preloaded here between the additional component 35 and the free end of the valve head 9. However, the spring element 19 can also, for example, rest against an edge of the base body 4 of the plug 2, which acts as an axial stop. Radially extending bores 32 are also provided in the central part 11 and protrude into the sleeve-shaped or cylindrical valve base 10. When the plug pin 6 of the plug 2 is inserted into the plug-in area 22 of the adapter 3, the free ends of the valve bases 10, 25 come into operative contact with one another. By appropriately designing the spring elements 19 of the adapter 3 and the plug 2, it can be defined which of the spring-mounted valve heads 9, 24 opens first. The valve base 10 of the plug 2 presses the valve by resting against the valve base 25 of the adapter 3.

[0046] 23 of adapter 3 from the sealed position to the open position. At the same time, the valve base 25 of adapter 3 pushes valve 8 of plug 2 into the open position. Fluid can flow through the bores 32 in the valves, as indicated by flow lines 36, through plug 2 and adapter 3.

[0047] Figure 9 shows a partial sectional view of a plug-in system 1 with an adapter 3 configured as shown in Figures 7 and 8 as a shaped bore. As shown schematically in Figure 9, the adapter 3 can also be provided as a shaped bore in an assembly 33. In this case, the sealing surface 14 of the valve head

[0048] 24 does not seal against the base body 20, but rather against a press-fitted sleeve 27, which forms a corresponding contact surface 15 for the sealing surface 14 of the valve head 24. The spring element (not shown) can, for example, be supported accordingly on the press-fitted sleeve 27 and the radial webs of the valve base 25.

Claims

PATENT CLAIMS 1 . Plug-in system (1) with a plug (2) and an adapter (3) which can be connected to and separated from each other, wherein the plug (2) - has a sleeve-shaped base body (4) with a through hole (5), - at a first end a plug-in pin (6) which can be inserted into the adapter (3) and at a second end opposite the first end a connection end (7) for connection to a line, - a pressure-movable valve (8) which can be moved from a sealing position to an open position by a relative movement of the plug (2) with respect to the adapter (3) along a longitudinal axis of the plug (2) and can be returned to the sealing position by a spring force, wherein the adapter (3) - comprises a sleeve-shaped base body (20) with a through-bore (21), - has a plug-in area (22) for receiving the plug-in pin (6), - a pressure-movable valve (23) which can be moved from a sealing position to an open position by a relative movement of the plug (2) with respect to the adapter (3) along a longitudinal axis of the adapter (3) and can be returned to the sealing position by a spring force.

2. Plug-in system (1) according to claim 1, characterized in that the plug (2) comprises a locking device (29), the locking elements (31) of which engage in corresponding receptacles on a peripheral surface of the adapter (3) and fix the plug pin (6) in a locking position.

3. Plug-in system (1) according to claim 2, characterized in that the locking device (29) comprises at least one spring and / or a retaining ring.

4. Plug-in system (1) according to one of the preceding claims, characterized in that the valve (23) of the adapter (3) comprises a valve head (24) and a valve base (25) which are connected via a central part (26).

5. Plug-in system (1) according to claim 4, characterized in that the valve head (24) of the valve (23) of the adapter (3) comprises a circumferential sealing surface (14).

6. Plug-in system (1) according to claim 5, characterized in that the sealing surface (14) of the valve head (24) of the valve (23) of the adapter (3) is in sealing contact with a corresponding contact surface (15) of the base body (20) of the adapter (3) in the sealing position of the plug-in system (1).

7. Plug-in system (1) according to claim 6, characterized in that the valve (23) of the adapter (3) comprises a sleeve (27) which forms a contact surface (15) for the sealing surface (14) of the valve head (24) for sealing contact and the sleeve (27) or valve head (24) can be moved in a relative movement against the spring force of a spring element (19) from the sealing position into the open position.

8. Plug-in system (1) according to claim 7, characterized in that the sleeve (27) is arranged in the adapter (3) by means of press-fitting and the valve head (24) is movable relative to the sleeve (27).

9. Plug-in system (1) according to claim 7, characterized in that the valve foot (25) of the valve (23) of the adapter (3) is axially secured in the base body (20) and the sleeve (27) is movable in a relative movement to the valve head (24) from the sealing position into the open position.

10. Plug-in system (1) according to one of the preceding claims, characterized in that the valve (8) of the plug (2) comprises a valve head (9) and a valve base (10) which are connected via a central part (11).

11. Plug-in system (1) according to claim 10, characterized in that the valve head (9) of the valve (8) of the plug (2) comprises a circumferential sealing surface (14).

12. Plug-in system (1) according to claim 11, characterized in that the sealing surface (14) of the valve head (9) of the valve (8) of the plug (2) is in sealing contact with a corresponding contact surface (15) of the base body (4) of the plug (2) in the sealing position of the plug-in system (1).

13. Plug-in system (1) according to one of the preceding claims 10-12, characterized in that the valve head (9) of the valve (8) of the plug (2) is movable from its sealing position relative to the base body (4) of the plug (2) along a longitudinal axis linearly against a spring force into its open position.

14. Plug-in system (1) according to claim 13, characterized in that the valve base (10) of the valve (8) of the plug (2) is supported on a spring element (19) axially mounted in the base body (4).

15. Plug-in system (1) according to claim 10, characterized in that guide webs extending radially to the longitudinal axis of the valve (8) of the plug (2) are attached to the central part (11).

16. Plug-in system (1) according to one of the preceding claims 4-13, characterized in that the valve head (24) of the valve (23) of the adapter (3) and / or the valve head (9) of the valve (8) of the plug (2) has bores (32).

17. Plug-in system (1) according to one of the preceding claims, characterized in that the adapter (3) is arranged as a pre-assembled unit in a shaped bore of an aggregate (33).

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