Pressure holding valve for air spring and air spring including pressure holding valve

Abstract

The present invention relates to a pressure-maintaining valve for an air spring and an air spring including the pressure-maintaining valve, the pressure-maintaining valve comprising: a first valve body in an opening of the air spring, which has an inlet; a second valve body connected to the first valve body, the cavity of which is in fluid communication with the inlet and has at least one side outlet; a reset member arranged in the cavity outside the inlet for providing a preload force toward the inlet; a closing component in the cavity, which moves from a closed state to an open state against the preload force; an actuating device, which has a head, a rod extending from the head, and at least one flow channel extending from the head at least partially along the rod, the head being outside the inlet and having a larger diameter than the inlet, the rod being able to enter the cavity through the inlet, and the actuating device moving the closing component out of the closed state when a force acting opposite to the preload force causes the actuating device to move from the inlet to the cavity with the rod. The present invention provides a pressure-maintaining valve that is low in cost and saves space.

Description

Technical Field

[0001] The invention relates to a pressure-maintaining valve for an air spring and an air spring comprising the pressure-maintaining valve. Background Art

[0002] Air springs can be used for the suspension of motor vehicles, the volume of which can be adjusted by means of a pneumatic system. For level adjustment, air can be fed into the air spring or discharged from the air spring. To feed air into the air spring, an inlet valve is used, which is inserted into an opening in the air spring. A hose is connected to the inlet valve, which establishes a pneumatic connection between a pressure source and the valve. To avoid pressure losses in the air spring, an inlet valve is used which closes automatically when the hose is separated from the inlet valve.

[0003] For this purpose, it is known from DE 10 2007 034 581 B4 that an air line connection is provided, which has an inlet provided with a closing part for filling the cavity. The closing part closes the inlet and is pressed against the inlet by means of a reset part for this purpose. When the air line is connected to the air line connection, the air line is guided through the inlet and the closing part is pressed out of the inlet against the resistance of the reset part. The inlet is thus opened. When the air line is removed from the inlet, the closing part is pressed against the inlet again by the reset part and closes it again. This valve requires a large radial structural space. As the radial dimensions increase, the requirements for the sealing surface fit accuracy and the amount of material used increase. As a result, the valve is cost-intensive. Summary of the invention

[0004] The object of the present invention is therefore to provide a pressure-holding valve for a pneumatic spring which requires little radial installation space at least in certain areas and is cost-effective.

[0005] In one aspect, the present invention relates to a pressure-maintaining valve for an air spring, wherein the pressure-maintaining valve comprises: a first valve body for being arranged in an opening of the air spring, wherein the first valve body has an inlet connected to a pipeline fluid communication; a second valve body connected to the first valve body, wherein the second valve body comprises a cavity connected to the inlet fluid communication and having at least one side outlet that can be connected to the air spring fluid communication; a reset member for providing a preload force toward the inlet, wherein the reset member is arranged in the cavity outside the inlet; a closing member arranged in the cavity, wherein the closing member is closed from the inlet therein. The closed state moves to the open state where the inlet is opened against the preload; an actuator having a head, a rod extending from the head and at least one flow channel extending from the head at least partially along the rod, wherein the head is arranged outside the inlet on the side of the inlet facing away from the cavity and has a larger diameter than the inlet, wherein the rod is movably arranged to enter the cavity through the inlet, and the actuator is designed to move the closure component out of the closed state when a force greater than the preload acting on the head in an opposite manner to the preload causes the actuator to move the rod from the inlet into the cavity.

[0006] By means of the present invention, a low-cost pressure-holding valve is provided, which opens when connected to a pipeline so that the pipeline compresses the head and closes when the pipeline does not compress the head. As a result, the air pipeline can already be pre-installed and clamped in the pipeline positioning device without causing the valve to open. The pressure-holding valve is only switched to an open state when a further movement is made to cause the head to be pressed downward. For this purpose, the pressure-holding valve has an inlet, which can be connected to a cavity in which at least one side outlet is provided. Air can flow into the air spring from the outlet when the pressure-holding valve is installed in the opening of the air spring. The inlet of the pressure-holding valve can be closed by means of a closing member. For this purpose, the closing member is pressed into the closed state of the closing member by means of a reset member toward the inlet, which closes the inlet at this time. The reset member is therefore arranged on the side facing the air spring in the installed state. The closing member is arranged between the reset member and the inlet. The closing member thus shields the reset member from the air flowing through the pressure-holding valve. Because the reset member is arranged in the cavity outside the inlet, its size can be set to any size almost arbitrarily without affecting the radial structural space of the valve in the section of the inlet and causing a large radial diameter in this area. The closure member can also be moved from the closed state to the open state in which the inlet is opened by the actuating device by means of a connected pipeline. For this reason, the actuating device extends through the inlet and connects the pipeline to the closure member. The actuating device has a head, the diameter of which is larger than the inlet and the head is arranged outside the inlet. Therefore, the head is not guided into the inlet. In addition, the head is also arranged outside the cavity on the other side of the inlet. The rod of the actuating device extends through the inlet and can enter the cavity to operate the closure member when a force acts on the head. The pipeline can be connected to the head. By means of the connection, the force acting on the head can be realized by the pipeline. The rod transmits the force through the inlet to the closure member. When the force exceeds the resistance achieved by the reset member to the closure member, the closure member moves from the locked state to the open state. The pipeline itself is not guided through the inlet for this reason and does not directly contact the closure member. Because the pipeline does not have to be guided through the inlet to operate the closure member, the inlet can therefore be designed to have a smaller diameter than the pipeline. Therefore, the entire pressure-maintaining valve can be designed to have a reduced floor space requirement, and the actuating device also includes at least one flow channel, which extends from the head at least partially along the stem. Therefore, the flow channel provides a fluid communication connection between the pipeline connected to the head and the cavity along the inlet in an open state. The inlet itself does not have a flow channel that guides air from the pipeline along the actuating device into the cavity. Therefore, it will be avoided that the inlet is enlarged by an additional flow channel. The closure member therefore only needs a slightly larger diameter than the inlet in order to be able to close it. Therefore, the floor space requirement of the pressure-maintaining valve can be further reduced. Smaller floor space requirements also further reduce the cost of the pressure-maintaining valve. In addition, the components of the pressure-maintaining valve, except for the closure member, can have large tolerances without adversely affecting its function.Due to the increased tolerances in the processing of, in particular, the inlet, the actuating means and the first and second valve bodies, further cost savings can be achieved when manufacturing the pressure-holding valve. When the second valve body is manufactured by means of an injection molding method or a die casting method, the formation of the side outlet does not require a bore. Instead, the side outlet can be manufactured inexpensively by means of a slide in an injection molding mold or a die casting mold.

[0007] According to one example, it is conceivable that the first valve body, the second valve body and / or the actuating means are made of plastic or a cast alloy, thereby requiring no or only a small amount of machining or mechanical reprocessing of the components.

[0008] Due to the large tolerances permitted by the invention, plastic or cast alloys can be used for the components of the pressure-retaining valve, thereby further reducing the manufacturing costs.

[0009] In another example, the first valve body, the second valve body and / or the actuating device may be an injection molded part and / or a die cast part.

[0010] Injection-molded parts and / or die-cast parts are usually very cost-effective, especially when produced in large quantities. Injection-molded parts and / or die-cast parts can be made of plastic or metal, especially aluminum.

[0011] The first valve body and the second valve body can be connected, for example, by means of a snap connection. It is advantageous for this to have a valve body with an elastic snap-in connection made of plastic.

[0012] Thus, the first valve body and the second valve body can be manufactured separately from one another. The two valve bodies are connected by means of a snap-on connection only when the pressure-holding valve is installed. The snap-on connection can, for example, have a snap hook, so that the two valve bodies only have to be plugged together when the pressure-holding valve is assembled. By means of the preassembly, the pressure-holding valve can be installed as a preassembled unit in the valve seat in the opening of the air spring. Alternative connection possibilities of the two valve bodies are also conceivable, such as, for example, a threaded connection, a bayonet connection, an ultrasonic welding connection or a friction-fit connection or a force-fit connection.

[0013] Furthermore, the head can have at least one line contact surface for receiving a line end piece, which forms a partial surface of a ring, wherein the diameter of the ring is greater than the inlet.

[0014] The ring therefore also has a larger diameter than the shank. An annular pipeline with a pipeline end piece that can be engaged to the pipeline contact surface cannot therefore be introduced into the inlet. The opening of the air spring that can engage with the pipeline and the pressure holding valve can therefore have a diameter that only needs to be large enough to accommodate and hold the pipeline or the pipeline positioning device.

[0015] It is also conceivable that the shaft has, for example, a contact surface which is designed to contact the closure element.

[0016] There is therefore no fixed connection between the actuating element and the closure element. The actuating element can therefore be moved along the inlet, in particular in the locked state, away from the closure element. This makes it easier to manufacture the pressure-holding valve, since the actuating element can only be inserted into the inlet with the stem. When a force is applied to the head by means of the line, the contact surface engages the closure element automatically.

[0017] In another example, the flow channel may extend outside the actuation device.

[0018] Therefore, the manufacturing of the actuator device can be further simplified. Unlike the flow channel extending inside the actuator device, only the outer shape of the actuator device needs to be adjusted when manufacturing the flow channel of the peripheral device.

[0019] The actuation means may comprise, for example, four flow channels which extend on the outside of the actuation means and which together have a cross-shaped cross section.

[0020] More flow channels increase the possible flow volume and reduce the flow resistance of the actuator.In addition, the actuator with a cross-shaped cross section has a stable rigid shape.

[0021] In addition, the pressure holding valve may, for example, have an anti-loss mechanism for the actuating means, which is designed to limit the possible movement of the stem out of the cavity within the inlet.

[0022] Therefore, the rod is prevented from moving away from the inlet toward the head. Thus, when no pipeline is connected to the pressure holding valve or the pipeline positioning device is not disassembled, the actuating device is prevented from leaving the inlet and possibly being lost. This improves the working safety of the pressure holding valve.

[0023] The anti-loss mechanism may, for example, have at least one first hook arranged at the inlet and at least one second hook arranged at the shaft.

[0024] When the actuating device is installed in the inlet, the rod can be inserted into the inlet at the end of the inlet opposite to the cavity. The second hook is arranged to be locked with the first hook when the rod has not been inserted into the cavity.

[0025] In addition, according to one example, the first valve body may have a seal for contacting a wall portion of the opening of the air spring, which extends around the first valve body on the outside.

[0026] The first valve body seals the opening of the air spring, in which the pressure-holding valve is installed, with a seal from the surrounding environment, in particular when the line and / or the line positioning device are disassembled.

[0027] In another aspect, the invention relates to an air spring comprising an air spring chamber with an opening, wherein a pressure holding valve according to the above description is arranged in a first part of the opening directed towards the air spring chamber, and a pipeline positioning device is arranged in a second part of the opening facing away from the air spring chamber.

[0028] The advantages, functions and improvements of the air spring are derived from the advantages, functions and improvements of the pressure-holding valve described above. Therefore, reference is made to the previous description in this regard.

[0029] According to an example, the pressure holding valve can at least partially, in particular with at least one part of the second valve body, protrude into the air spring chamber. Here, a part of the second valve body on which the return member is arranged can in particular completely protrude into the air spring chamber.

[0030] The pressure-holding valve thus requires a valve seat in the air spring opening only for a short axial extension. The reset element can be designed to any size, since it is not arranged with the second valve body in the opening, but only in the air spring chamber. This makes it easier to install the pressure-holding valve in the air spring. In this case, the second valve body can be connected to the first valve body after the first valve body has been installed in the opening. The pressure-holding valve is not preassembled in this case.

[0031] For example, it is also conceivable that the pressure holding valve is fixed in the axial direction of the opening by means of a line positioning device.

[0032] In particular, in the closed state, when the air spring is under pressure, the pressure holding valve is fixed in the opening of the air spring. The line positioning device reduces the risk that the pressure holding valve is pressed into the opening from the air spring or also pressed out of the air spring through the opening in the closed state. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Further features, details and advantages of the invention emerge from the wording of the claims and from the following description of exemplary embodiments in conjunction with the figures, in which:

[0034] Figure 1a to Figure 1c A schematic diagram showing a pressure holding valve in a locked state;

[0035] Figure 2 A schematic cross-sectional view showing a pressure holding valve in an open state;

[0036] Figure 3 A schematic diagram showing a first valve body;

[0037] Figure 4a and Figure 4b a schematic diagram showing a second valve body; and

[0038] Figure 5a and Figure 5bA schematic diagram showing another embodiment of a pressure maintaining valve.

[0039] Reference numerals list

[0040] 10 Pressure holding valve

[0041] 12 First valve body

[0042] 14 Second valve body

[0043] 16 Import

[0044] 17 Container

[0045] 18 Pipeline

[0046] 20 chambers

[0047] 22 Side exit

[0048] 24 Reset

[0049] 26 Closure parts

[0050] 27 Actuator

[0051] 28 Head

[0052] 30 Rod

[0053] 31 Gap

[0054] 32 Runner

[0055] 34 first hook

[0056] 36 Pipeline contact surface

[0057] 38 Abutment surface

[0058] 40 first hook member

[0059] 42 second hook member

[0060] 44 Seals

[0061] 46 Air spring

[0062] 48 Opening

[0063] 50 Pipeline positioning device

[0064] 51 Locating ring

[0065] 52 second hook member

[0066] 54 Seat

[0067] 56 Pipeline end fittings

[0068] 58 tanks

[0069] 60 Seals

[0070] 62 Air spring chamber DETAILED DESCRIPTION

[0071] The pressure holding valve is generally denoted below by reference numeral 10 .

[0072] Figure 1a , Figure 1b and Figure 1c A pressure holding valve 10 is shown. Figure 1a FIG. 1 shows the entirety of the pressure holding valve 10. Figure 1a The pressure holding valve 10 has a first valve body 12 and a second valve body 14 .

[0073] exist Figure 1b and Figure 1c A part of the pressure holding valve 10 is not shown in the drawing so that the interior of the valve bodies 12, 14 can be seen. The pressure holding valve 10 therefore also has a return element 24, a closing part 26 and an actuating means 27.

[0074] The first valve body 12 is designed to be inserted into the opening of the air spring. A seal 44 extends around the first valve body 12 and seals the gap between the opening of the air spring and the first valve body 12 .

[0075] An inlet 16 extends through the first valve body 12 and can be connected to a pipeline in a fluid communication manner. The pipeline can connect the inlet 16 to a pressure source so as to pass air into the air spring via the pressure holding valve 10. For this purpose, the pressure holding valve 10 is designed as an air inlet valve.

[0076] The first valve body 12 is connected to the second valve body 14 having a cavity 20. The inlet 16 leads into the cavity 20 having at least one side outlet 22. The connection of the two valve bodies 12, 14 can be achieved by means of a snap connection. Alternative possible connection modes of the two valve bodies 12, 14 can be conceivable, such as, for example, a threaded connection, a bayonet joint, an ultrasonic welding connection or a friction fit connection or a force fit connection. For this purpose, the first valve body 12 can have a first hook 34 and the second valve body 14 can have a second hook 52. The hooks 34, 52 are designed so that they can be plugged in to connect the first valve body 12 to the second valve body 14. The second hook 52 can be arranged at the side outlet 22 so that the first hook 34 is partially placed in the outlet 22 when locked.

[0077] A closing member 26 is provided in the cavity 20. The closing member 26 is pressed against the inlet 16 by means of the reset member 24 and locks or closes the inlet 16. Figure 1bIn this position, the closure member 26 is in a locked state. In this example, the reset member 24 is arranged outside the inlet 16 and also in the cavity 20. It causes a preload toward the inlet 16.

[0078] An actuating means 27 with a stem 30 is arranged in the inlet 16, the stem extending from a head 28 of the actuating means 27. The head 28 has a larger diameter than the inlet 16 and cannot be inserted into the inlet 16. Furthermore, the inlet 16 is arranged between the head 28 and the cavity 20.

[0079] At least one flow channel 32 extends along the stem 30. The flow channel 32 starts at the head 28. In this example, the actuation means 27 comprises four flow channels 32, which start at the end face of the head 26. A recess 31 may be provided at the end face, from which the flow channel 32 extends towards the stem 30.

[0080] The actuating device 27 is movably arranged along the inlet 16. It can move through the inlet 16 with the rod 30, that is, the rod 30 moves into the cavity 20. When the rod 30 moves into the cavity 20, the abutment surface 38 of the rod 30 abuts against the surface of the closing member 26. When the actuating device 27 moves toward the cavity 20 with a force greater than the preload force of the reset member 24, the closing member 26 moves from the inlet 16 to the open state. Figure 1c is shown in .

[0081] This force can be based on Figure 2 The transmission is carried out by means of a pipeline 18 which is connected to the pipeline contact surface 36 of the head 28 by means of a pipeline end piece 56. Figure 2 , the closure part 26 is in the open state. In addition, a part of the air spring 46 is shown, which includes an opening 48. The pressure holding valve 10 is arranged in a first part of the opening 48, which first part points to the air spring chamber 62 of the air spring 46. A pipeline positioning device 50 is provided in a second part of the opening 48 facing away from the air spring chamber 62 of the air spring 46. In this example, the pipeline 18 can be guided through the pipeline positioning device 50. The positioning ring 51 prevents the pipeline 18 from moving out of the pipeline positioning device 50. Here, the pipeline 18 is already retained by the pipeline positioning device 50 when entering it, and then it contacts the head 28. The pipeline 18 can only be removed from the opening 48 when the pipeline positioning device 50 is removed from the opening 48 in this example.

[0082] The pipeline 18 can be guided through the pipeline positioning device 50 until it contacts the pipeline contact surface 36 of the actuating element 27. The pipeline contact surface 36 is here a partial surface of a ring, the diameter of which is larger than the inlet 16. Inserting the pipeline 18 with a force greater than the preload force of the reset element 24 causes the actuating element 27 to move the closure element 26 with the rod 30 from the closed state to the open state.

[0083] The line 18 is inserted only after the line positioning device 50 and the pressure retaining valve 10 are installed in the opening 48 .

[0084] The pressure holding valve 10 is fixed in the opening 48 in this example by means of the first valve body 12 .

[0085] Also like Figure 2 As shown, the second valve body 14 protrudes mostly from the opening 48 into the air spring chamber 62 of the air spring 46. In particular, the part of the second valve body 14 provided with the reset element 24 protrudes into the air spring chamber 62. The side outlet 22 is connected to the fluid connection of the air spring chamber 62. In the open state, there is a fluid connection between the air spring chamber 62 and the pipeline 18 via the side outlet 22, the chamber 20 and the inlet 16 or the flow channel 32. The reset element 24 is arranged substantially outside the air flow flowing along the fluid connection. It is shielded from the air flow by the closure element 26.

[0086] In order to prevent the actuating device 27 from being removed from the inlet 16, the pressure holding valve 10 includes an anti-lost mechanism for the actuating device 27. The anti-lost mechanism has a first hook 40 at the inlet 16. On the rod 30, the anti-lost mechanism has a second hook 42. These hooks 40, 42 are designed so that they can only move relative to each other toward the cavity 20 after the second hook 42 has passed the position of the first hook 40. Once the second hook 42 moves with the rod 30 to the position of the first hook 40, the movement in the opposite direction is locked after the actuating device 27 is inserted into the inlet 16 with the rod 30.

[0087] The first valve body 12, the second valve body 14 and / or the actuating means 27 can be made of plastic and manufactured by injection molding. Alternatively, these components can be made of metal, such as aluminum. They can also be manufactured by injection molding or die casting.

[0088] Since the first valve body 12, the second valve body 14 and the actuating means 27 are only plugged into each other and do not have to have mutually sealed surfaces, the tolerances of the components can be large. This is conducive to the inexpensive manufacture and installation of the components. Only the sealing surface between the inlet 16 and the closure member 26 must be manufactured within small tolerances, especially with regard to the flatness of the sealing surface, in order to achieve a reliable seal in the closed state.

[0089] Figure 3 The schematic cross-sectional view of the first valve body 12 with the inlet 16 and the first hook member 40 is shown. The first valve body 12 further has a receiving groove 17, the diameter of which is larger than the inlet 16. The head 28 of the actuator 30 can be arranged in the receiving groove 17.

[0090] Figure 4a and Figure 4b The second valve body 14 is shown with the cavity 20 , the second hook 52 and the two side outlets 22 .

[0091] In addition, Figure 4a 24. The closure member 26 is shown in the figure in an open state, wherein a force acts on the closure member 26, which overcomes the resistance or preload of the closure member 24.

[0092] Figure 4b Another view shows the second valve body 14. It can be clearly seen that the second hook member 52 is arranged above the side outlet 22. In addition, a seat 54 for the reset member 24 can be seen, which can be designed as a helical spring.

[0093] Figure 5a and Figure 5b The pressure maintaining valve 10 is shown in an alternative embodiment.

[0094] according to Figure 5a , the pipeline positioning device 50 and the pressure holding valve 10 are placed in the opening 48 of the air spring 46. The pipeline positioning device 50 is designed to be able to remove the pipeline 18 from the pipeline positioning device 50.

[0095] The fixing of the pressure holding valve 10 in the opening 48 is achieved in this example by means of the first valve body 12 in the direction of the air spring chamber 62. In the opposite direction, the pressure holding valve 10 can be fixed in the axial direction by means of the line positioning device 50.

[0096] exist Figure 5b The pressure holding valve 10 of this example is shown separately in FIG. The first valve body 12 comprises a further groove 58 above the groove 17 for accommodating a further seal 60. The seal 60 seals the pipeline 18 relative to the pipeline positioning device 50 and the external environment.

[0097] The present invention is not limited to one of the above-described embodiments but can be modified in various ways.

[0098] All features and advantages from the claims, the description and the figures, including constructional details, spatial arrangements and method steps, may be essential to the invention both individually and also in various combinations.

Claims

1. A pressure-maintaining valve for an air spring (46), wherein: The pressure maintaining valve (10) comprises: a first valve body (12) for being arranged in an opening (48) of an air spring (46), wherein the first valve body (12) has an inlet (16) which can be connected in fluid communication with a pipeline (18); - a second valve body (14) connected to the first valve body (12), the second valve body (14) comprising a chamber (20) connected in fluid communication with the inlet (16) and having at least one side outlet (22) connectable in fluid communication with an air spring (46); a return element (24) for providing a preload in the direction of the inlet (16), wherein the return element (24) is arranged in the cavity (20) outside the inlet (16); a closure member (26) arranged in the cavity (20), wherein the closure member (26) is movable against the preload force from a closed state in which the inlet (16) is closed to an open state in which the inlet (16) is opened; and - an actuating device (27) having a head (28), a stem (30) extending from the head (28) and at least one flow channel (32) extending from the head (28) at least partially along the stem (30), wherein the head (28) is arranged outside the inlet (16) on a side of the inlet (16) facing away from the cavity (20) and has a larger diameter than the inlet (16), wherein the stem (30) is arranged to be able to enter the cavity (20) through the inlet (16), and the actuating device (27) is designed When a force greater than the preload force acts on the head (28) in the opposite direction to the preload force, the actuating device (27) moves with the rod (30) from the inlet (16) into the cavity (20), causing the closure component (26) to move out of the closed state, wherein the first valve body (12) and the second valve body (14) are connected by means of a snap connection (34, 52), and wherein the first valve body (12) and the second valve body (14) having elastic snap connections are made of plastic, and wherein the flow channel (32) extends outside the actuating device (27).

2. The pressure holding valve according to claim 1, characterized in that: The first valve body (12), the second valve body (14) and / or the actuating means (27) are made of plastic.

3. The pressure holding valve according to claim 1 or 2, characterized in that: The first valve body (12), the second valve body (14) and / or the actuating device (27) are injection-molded parts and / or die-cast parts.

4. The pressure maintaining valve according to claim 1, characterized in that: The head (28) has at least one line contact surface (36) for receiving a line end piece (56), the at least one line contact surface forming a partial surface of a ring, wherein the diameter of the ring is larger than the inlet (16).

5. The pressure maintaining valve according to claim 1, characterized in that: The rod portion (30) has a contact surface (38) designed to contact the closing component (26).

6. The pressure maintaining valve according to claim 1, characterized in that: The actuating device (27) comprises four flow channels (32) which extend outside the actuating device (27) and have a cross-shaped cross section.

7. The pressure maintaining valve according to claim 1, characterized in that: The pressure-holding valve (10) has an anti-loss mechanism for the actuating means (27), the anti-loss mechanism being designed to limit the mobility of the stem (30) out of the chamber (20) within the inlet (16).

8. The pressure maintaining valve according to claim 7, characterized in that: The anti-loss mechanism has at least one first clip (40) disposed at the inlet (16) and at least one second clip (42) disposed at the rod (30).

9. The pressure maintaining valve according to claim 1, characterized in that: The first valve body (12) has a seal (44) for seating on a wall of an opening (48) of an air spring (46), the seal extending around the first valve body (12) on the outside.

10. An air spring comprising an air spring chamber (62) having an opening (48), wherein: A pressure holding valve (10) according to any of the preceding claims is arranged in a first part of the opening (48) pointing toward the air spring chamber (62), and a line positioning device (50) is arranged in a second part of the opening (48) oriented away from the air spring chamber (62).

11. The air spring according to claim 10, characterized in that: The pressure holding valve (10) at least partially protrudes into the air spring chamber (62).

12. The air spring according to claim 10 or 11, characterized in that: The pressure holding valve (10) is fixed in the axial direction of the opening (48) by the pipeline positioning device (50).

13. The air spring according to claim 11, characterized in that The pressure holding valve (10) projects at least partially into the air spring chamber (62) with at least a portion of the second valve body (14) in which at least the restoring element (24) is arranged.

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