Inflatable water sports equipment and drain valve

Abstract

The invention provides an inflatable water sports device 300, 400 comprising at least one inflatable structure 301 with a drain valve 100 through which air can be released from an interior of the structure 301 when the drain valve 100 is open. The drain valve comprises a valve housing 10, which is connected to the structure 301 and has a passage through which the air can be released from the interior, and a valve closure 20 for closing the drain valve 100, wherein the valve closure 20 and the valve housing 10 each have threaded sections 13, 23 adapted to each other for forming a threaded connection 30 between the valve closure 20 and the valve housing 10, and the drain valve 100 can be moved from a closed state to the open state by loosening the threaded connection 30, and one of the threaded sections 13;23 has at least one passage opening 31-1, 31-2, which in the closed state is closed by the respective other threaded section 23; 13 and which can be opened by partially loosening the threaded connection 30, such that air can be released from the interior through the passage and the at least one opened passage opening 31-1, 31-2, while the valve closure 20 is still in interaction with the valve housing 10 via the threaded connection 30.;

Description

Technical field

[0001] The present invention relates to an inflatable water sports device and a drain valve. Background of the invention

[0002] Inflatable water sports equipment, particularly in surfing, is known from the field of water sports, specifically surfing equipment, which can only be used as intended after inflating its structure. This has the advantage, among others, that the equipment can be transported in a space-saving manner when deflated and only reaches its final, intended shape at its destination through inflation.

[0003] Examples that are not restrictive include an inflatable wing rig or an inflatable kite, which are surfing equipment that allows the user to be pulled on a board over water, but also over land (ice, snow, sand, etc.).

[0004] Other examples of inflatable water sports equipment include inflatable canoes, kayaks, dinghies, rafting boats, SUP boards (stand-up paddleboards), surfboards, or wingboards.

[0005] The inflatable water sports equipment is pressurized with a comparatively high air pressure in order to provide the necessary rigidity for use.

[0006] In order to be able to release the pressurized air contained in the water sports equipment as completely and quickly as possible after use, these devices preferably have a release valve.

[0007] Due to the high air pressure, these drain valves are subjected to comparatively high mechanical stress, especially from the pressure surge that occurs directly when opening. Summary

[0008] Based on this, it is now an object of the present invention to create a mechanically more robust, durable and controlled way to quickly release air from an inflatable water sports device.

[0009] To solve this problem, an inflatable water sports device according to claim 1 and a drain valve according to claim 15 are provided.

[0010] The respective dependent claims relate to preferred embodiments, which can each be provided individually or in combination.

[0011] According to a first aspect of the invention, an inflatable water sports device is provided, comprising at least one inflatable structure with a drain valve through which air can be released from an interior of the structure when the drain valve is open. The drain valve comprises a valve housing connected to the structure and having a passage through which the air can be released from the interior, and a valve closure for closing the drain valve. The valve closure and the valve housing each have threaded sections adapted to each other for forming a threaded connection between the valve closure and the valve housing. The drain valve can be moved from a closed state to an open state by loosening the threaded connection, and one of the threaded sections has at least one through-hole.which in the closed state is sealed by the other threaded section and which can be opened by partially loosening the threaded connection, in such a way that air from the interior can be released through the passage and the at least one open passage opening, while the valve closure is still in interaction with the valve housing via the threaded connection.

[0012] Put simply, the design with the through-hole in the threaded section allows pressurized air to be released from the interior even before the valve closure or its threaded section is completely detached from the valve housing.

[0013] The pressurized air first flows through the passage opening in the threaded section, the cross-sectional area of ​​which is particularly smaller than that of the passage, whereby the mechanical effects of the pressure surge on the drain valve and especially on the valve closure are greatly minimized, since it is still partially connected to the valve housing via the threaded connection designed for fastening and is not abruptly moved by the escaping air, for example, after the drain valve is opened for the first time.

[0014] This significantly reduces the point load on the drain valve when releasing pressurized air, making it essentially more robust for air release. Furthermore, the reduced load also increases the service life of the drain valve, as it minimizes the effects of material fatigue.

[0015] Partial loosening of the threaded connection means that the threaded sections are not completely separated from each other, but are still in contact with each other, whereby the partial loosening reduces the total contact area of ​​the contacting areas of the two threaded sections.

[0016] The effective flow cross-sectional area of ​​the drain valve is the sum of all flow cross-sectional areas through which, in any state of the drain valve, the environment is connected to the interior for air release. In the closed state, where no air release through the drain valve is possible, the effective flow cross-sectional area is preferably zero; there is no connection between the environment and the interior through the drain valve.

[0017] Preferably, the effective flow cross-sectional area is larger in the fully open state of the drain valve than in the closed state and is maximal under all possible states of the drain valve.

[0018] Preferably, the ratio of the flow cross-sectional area of ​​the at least one through-hole to the effective flow cross-sectional area of ​​the drain valve in the fully open state is 2 to 50%, and more preferably 5 to 30%.

[0019] Preferably, the threaded connection is completely loose when the drain valve is fully open, or alternatively, it has the smallest total contact area of ​​the contacting areas of both thread sections.

[0020] The threaded sections are preferably designed as integral components of the valve housing and / or the valve closure.

[0021] Preferably, the valve housing and / or the valve closure are made of a plastic or a composite material.

[0022] The valve housing is preferably fixed to an outer skin of the inflatable structure in such a way that the valve housing penetrates it.

[0023] Preferably, the valve housing comprises an inner body which has a passage channel for the air and which is, in particular, largely located inside the inflatable structure.

[0024] The threaded section of the valve housing for creating the threaded connection with the threaded section of the valve closure is preferably designed as part of the inner body, in particular as an integral part of the inner body.

[0025] Preferably, the valve housing further comprises a clamping ring adapted to and attachable to the inner body, wherein a section of the outer skin of the structure can be clamped between the inner body and the clamping ring. The clamping ring and inner body can be fastened via a threaded connection.

[0026] Preferably, the valve housing includes an additional sealing element at such an interface between the inner body and the clamping ring.

[0027] Preferably, the inner body and the clamping ring are essentially ring-shaped.

[0028] In a preferred embodiment, the threaded section that has the at least one through-hole is the threaded section of the valve closure.

[0029] Alternatively, the threaded section of the valve housing can also have at least one through-hole.

[0030] In a preferred embodiment, the at least one passage opening lies between two adjacent thread flanks of one thread section and penetrates the thread root of that thread section.

[0031] An alternative and common term for thread root is, for example, thread valley.

[0032] Preferably, the through-hole only penetrates the thread root, so that the thread flanks in the area of ​​at least one through-hole have the same dimensions as the thread flanks in other areas where no through-hole is present.

[0033] This ensures that the thread flanks, which are crucial for the threaded connection, are not mechanically weakened by material recesses or the like, or reduced in terms of the contact area for producing the threaded connection.

[0034] This allows for secure attachment of the valve closure to the valve housing despite the passage opening when the valve is closed.

[0035] Preferably, at least one passage opening is designed in a slit-like shape.

[0036] In a preferred embodiment, the at least one passage opening extends continuously along a circumferential direction of the threaded section from a first end to a second end of the at least one passage opening, wherein the first and the second end enclose an angle of 2° to 90°, in particular 5° to 45°, with respect to the one threaded section.

[0037] Directions with respect to the threaded section can be described by reference to a longitudinal, circumferential, or radial direction. These directions are, in particular, directions of a cylindrical coordinate system, where the longitudinal direction runs parallel to an axis of rotation about which the valve housing or valve closure must be rotated to make or break the threaded connection. The radial direction extends radially outward from a center of the valve housing or valve closure, perpendicular to the longitudinal direction, and the circumferential direction runs tangentially to the circumferential surface of the valve housing or valve closure and is perpendicular to both the longitudinal and radial directions.

[0038] However, the drain valve is not limited to the version with one through-hole, but can also have several of these through-holes, which allow drainage while the threaded connection is still in place.

[0039] In a preferred embodiment, one of the threaded sections has two or more passage openings which, in the closed state, are closed by the respective other threaded section and which can each be opened by partially loosening the threaded connection, such that air can be released from the interior through the passage and the respective opened passage opening, while the valve closure is still in interaction with the valve housing via the threaded connection.

[0040] In this way, air can be released at several points of the threaded section, which are preferably arranged symmetrically to each other, before the thread is completely loosened, in order to reduce the load on a single sub-area around a respective passage opening.

[0041] In a preferred embodiment, at least two of the passage openings are arranged on the one threaded section in such a way that they are opened one after the other by a relative rotation of the valve closure and valve housing to loosen the threaded connection.

[0042] In this way, when the threaded connection is loosened, the effective flow cross-sectional area of ​​the drain valve gradually increases, even before it reaches its fully open state.

[0043] In the case of multiple passage openings, these can be arranged arbitrarily in relation to the single threaded section.

[0044] In a preferred embodiment, a possible arrangement is such that at least two of the passage openings, which are opened successively by the relative rotation of the valve closure and the valve housing, are arranged offset from each other in the circumferential direction and / or in the longitudinal direction of the threaded section with respect to one threaded section.

[0045] Preferably, these are arranged one above the other with a longitudinal offset and without angular offset.

[0046] Preferably, these openings are offset from each other in the longitudinal direction simultaneously with the circumferential offset. The circumferential offset is preferably 50% of the circumference of the threaded section, so that the openings are essentially opposite each other across the center of the threaded section, i.e., offset by 180°.

[0047] Preferably, at least two of the passage openings, which are opened successively by the relative rotation of the valve closure and the valve housing, are offset from each other in the longitudinal direction of the thread section with respect to one thread section and are separated by an intermediate thread flank, preferably by only one.

[0048] Instead of providing all of the multiple through-holes on one threaded section, the other threaded section can also have through-holes of the type described above.

[0049] In a preferred embodiment, both threaded sections each have at least one passage opening which, in the closed state, is closed by the other threaded section and which can be opened by partially loosening the threaded connection, such that air can be released from the interior through the passage and the respective opened passage opening, while the valve closure is still in interaction with the valve housing via the threaded connection.

[0050] This allows the load from the airflow to be distributed between the valve housing and the valve closure.

[0051] In a preferred embodiment, the threaded section of the valve closure is designed as an external thread and the threaded section of the valve housing is designed as an internal thread.

[0052] Alternatively, the reverse design can also be used, in which the threaded section of the valve housing is preferably designed as an external thread and the threaded section of the valve closure as an internal thread.

[0053] In a preferred embodiment, the drain valve comprises a sealing element which, in the closed state, is clamped between the valve closure and the valve housing.

[0054] This improves the sealing effect of the drain valve when closed.

[0055] In a preferred embodiment, the valve closure comprises one or more stop sections adapted to a stop on the valve housing such that, after complete loosening of the threaded connection, they limit translational displacement of the valve closure relative to the valve housing when they interact with the stop.

[0056] In this way, the valve closure cannot be arbitrarily far from the valve housing, and in particular, an unwanted "shooting off" of the valve closure by the airflow present during release can be prevented.

[0057] In a preferred embodiment, the valve closure comprises at least two stop sections, which are formed at their respective ends by web sections extending from the threaded section in the longitudinal direction of the threaded section.

[0058] The web sections preferably extend through the passage of the valve housing, with the stop sections being designed as end sections bent over the respective web sections.

[0059] Preferably, the valve closure comprises four such bridge sections with corresponding stop sections.

[0060] To provide a force-symmetric arrangement, the web sections are preferably distributed at equal intervals along the circumference of the valve closure.

[0061] In a preferred embodiment, the water sports equipment is a surfing equipment, in particular a wing rig or a kite, and the inflatable structure is preferably an inflatable front tube of the kite or wing rig or an inflatable middle or transverse tube of the kite or wing rig.

[0062] The water sports equipment can also be an inflatable board, such as an inflatable surfboard or a stand-up paddleboard. Furthermore, the water sports equipment can also be an inflatable canoe, kayak, dinghy, raft, or wingboard.

[0063] The more robust drain valve is particularly suitable for use with surfing equipment that is typically exposed to extreme environmental conditions, such as pressure when inflated, UV radiation, sand, heat, cold or salt water, which can cause the material of the valve device to fatigue relatively quickly and thus make it more susceptible to damage.

[0064] The term "tube" is a technical term and essentially refers to structures shaped like hoses or tubes, which are stiffened in particular by inflation.

[0065] The "front tube" is also a technical term in the field and refers to a tube located at the front of the surfing equipment, which serves as a leading edge for the wind.

[0066] According to a second aspect of the invention, a drain valve is provided, in particular a drain valve for an inflatable water sports device according to the first aspect or one of its preferred embodiments. Air can be released from the interior of an inflatable structure via the drain valve when it is in an open state. The drain valve comprises a valve housing that is connectable to the structure and has a passage, and a valve closure for closing the passage. The valve closure and the valve housing each have threaded sections adapted to each other for forming a threaded connection between the valve closure and the valve housing. The drain valve can be moved from a closed state to an open state by loosening the threaded connection, and one of the threaded sections has at least one passage opening.which in the closed state is sealed by the respective other threaded section and which can be opened by partially loosening the threaded connection, such that in a state connected to the structure, air from the interior can be released through the passage and the at least one open passage opening, while the valve closure is still interacting with the valve housing via the threaded connection.

[0067] This provides a drain valve that can be used, for example, to retrofit a water sports device. The provided drain valve is essentially identical to the drain valve of the water sports device as described in the first aspect and offers all the same advantages.

[0068] The drain valve can be designed according to any of the specifications described in the context of the water sports equipment. A repetition of the individual specifications is omitted here.

[0069] Further aspects and their advantages, as well as more specific embodiments of the aforementioned aspects and embodiments, are described below with the aid of the drawings shown in the accompanying figures.

[0070] Fig. Figures 1A to 1D show in different views a first embodiment of the drain valve according to the invention or components thereof.

[0071] Fig. Figure 2 shows a perspective view of two embodiments of the water sports device according to the invention, here in the form of an inflatable wing rig and in the form of an inflatable wingboard.

[0072] It is emphasized that the present invention is in no way limited to the embodiments and features described below. The invention further comprises modifications of the aforementioned embodiments, in particular those resulting from modifications and / or combinations of individual or multiple features of the described embodiments within the scope of protection of the independent claims. Detailed character description Fig. Figures 1A to 1D show in different views a first embodiment of the drain valve 100 according to the invention or components thereof. Fig. Figure 1A shows an uncut side view, Fig. 1B a cut side view along the section line AA from Fig. 1A, Fig. Figure 1C shows a side view of an exploded view and Fig. Figure 1D shows a cutaway side view of valve closure 20. Fig. 1B in a representation rotated 90° around the vertical axis. Fig. 1A to 1D are described together below.

[0073] With the drain valve 100, which is in particular a drain valve 100 of an inflatable water sports device (see also Fig. 3) In an open state of the drain valve, 100 liters of air can be released from the interior of an inflatable structure, for example, a water sports device.

[0074] The drain valve 100 comprises a valve body 10, which is connectable to the structure and has a passage, and a valve closure 20 for closing the passage. Fig. 1A and Fig. Figure 1B shows a closed state in which no air can flow through the drain valve 100.

[0075] The valve closure 20 and the valve housing 10 each have matching threaded sections 13, 23 for creating a threaded connection 30 between the valve closure 20 and the valve housing 10.

[0076] The drain valve 100 can be opened from a closed state (for example, from Fig. 1B) by loosening the threaded connection 30 to bring it into the open position. This loosening is achieved in particular by relative rotation of the valve closure 20 and the valve housing 10.

[0077] Preferably, the threaded connection 30 is completely loosened when the drain valve 100 is fully open.

[0078] The threaded sections 13, 23 are preferably each designed as integral components of the valve housing 10 and / or the valve closure 20.

[0079] The valve housing 10 is preferably immovably attached to an outer skin of the inflatable structure in such a way that the valve housing 10 penetrates it. Fig. Figures 1A to 1C show a section 200 of the outer skin which is clamped between components of the valve housing 10.

[0080] Preferably the valve housing 10 comprises an inner body 11 which has a passage channel for the air and which is in particular arranged mostly inside the inflatable structure.

[0081] Preferably, the valve housing 10 further comprises a clamping ring 12 adapted to and attachable to the inner body, wherein a section 200 of the outer skin of the structure can be clamped between the inner body 11 and the clamping ring 13. The clamping ring 12 and the inner body 11 can be fastened via a threaded connection.

[0082] Preferably, the valve housing includes an additional sealing element (not shown here) at such an interface between the inner body and the clamping ring.

[0083] Preferably, the inner body 11 and the clamping ring 12 are essentially ring-shaped.

[0084] One of the threaded sections 13; 23 has at least one passage opening 31-1, 31-2, which in the closed state is closed by the respective other threaded section 23; 13 and which can be opened by partially loosening the threaded connection 30, such that in a state connected to the structure, air from the interior can be drained through the passage and the at least one opened passage opening 31-1, 31-2, while the valve closure 20 is still interacting with the valve housing 10 via the threaded connection 30.

[0085] This design makes it possible to release pressurized air from the interior via at least one through-hole 31-1- 31-2 in the threaded section 13, 23, even before the valve closure 20 or its threaded section 23 is completely detached from the valve housing 10.

[0086] In the present embodiment, the threaded section with the through-hole is the threaded section 23 of the valve closure 20, which even (non-limitingly) has two through-holes 31-1 and 31-2, which are provided in a slot-like form between two thread flanks of the threaded section 23. Fig. Figure 1D shows, in particular, a view through to the passage opening 31-2 from the section plane.

[0087] In the present case, the threaded section 13 of the valve housing 10 is preferably designed as an internal thread and the threaded section 23 of the valve closure 20 as an external thread.

[0088] The through-holes 31-1, 31-2 are preferably arranged such that they are opened sequentially by relative rotation of the valve closure 20 and the valve housing 10. With respect to the threaded section 23 of the valve closure 20, they are preferably arranged offset from one another in the circumferential direction and in the longitudinal direction L of the threaded section 23.

[0089] For example, the two passage openings are located opposite each other across the center of the valve closure 20 and are also offset from each other in the longitudinal direction, thus having a different height in relation to the threaded section 23.

[0090] To prevent the valve closure 20 from being fired away uncontrollably when opened, the valve closure 20 preferably comprises one or more stop sections 22 which are adapted to a stop 14 of the valve housing 10 in such a way that, after a complete loosening of the threaded connection 30, they limit a translational displacement of the valve closure 20 relative to the valve housing 10, here along the longitudinal direction L, when they are brought into interaction with the stop 14.

[0091] In the present case, the valve closure 20 comprises, for example, four such stop sections 22, which are arranged in particular symmetrically at equal intervals along the outer circumference of the valve closure 20.

[0092] The stop sections 22 are preferably formed at their respective ends by web sections 21 extending from the threaded section 23 of the valve closure 20 in the longitudinal direction L of the threaded section 23.

[0093] Preferably, the web sections 21 are spaced apart from each other in the circumferential direction of the threaded section 23, so that air can flow between them, especially when the drain valve 100 is open.

[0094] The described drain valve 100 of the exemplary embodiment provides a mechanically more robust, durable and controlled way to quickly release air from the interior of an inflatable structure, which is particularly suitable for water sports equipment with an inflatable structure.

[0095] Fig. Figure 2 shows a perspective view of two embodiments of the water sports device according to the invention, here in the form of an inflatable wing rig 300 and in the form of an inflatable wingboard 400.

[0096] The wing rig 300 includes at least one inflatable structure in the form of a front tube 301 with a drain valve 100, through which air can be released from an interior of the front tube 301.

[0097] The Wingboard 400 includes an inflatable structure with a drain valve 100, through which air can be released from the interior of the inflatable structure of the Wingboard 400.

[0098] The valve devices 100 of wing rig 300 and wingboard 400 can, for example, be in the form of the exemplary embodiment shown. Fig.1A to 1D may be designed, but may also deviate from this, as long as each comprises a valve housing connected to the respective structure and having a passage, and a valve closure for closing the passage, wherein the valve closure and the valve housing each have threaded sections adapted to each other for creating a threaded connection between the valve closure and the valve housing, and the drain valve can be moved from a closed state to the open state by loosening the threaded connection, and one of the threaded sections has at least one passage opening which, in the closed state, is closed by the other threaded section and which can be opened by partially loosening the threaded connection, such thatthat in a state connected to the structure, air from the interior can be drained through the passage and the at least one open passage opening, while the valve closure interacts via the threaded connection.

[0099] Above, exemplary embodiments of the present invention and their advantages have been described in detail with reference to the accompanying figures.

[0100] It is emphasized again that the present invention is in no way limited to the embodiments and features described above. The invention further comprises modifications of the aforementioned embodiments, in particular those resulting from modifications and / or combinations of individual or multiple features of the described embodiments within the scope of protection of the independent claims. List of reference symbols 10 Valve housings 11 Inner body 12 clamping ring 13 Threaded section of the valve housing 14 attacks 20 Valve closure 21 Bridge section 22 Stop section 23 Threaded section of the valve closure 30 threaded connection 31-1, 31-2 Passage opening 40 sealing element 100 drain valve 200 Section of the outer skin of the inflatable structure 300 Wing (wing rig) 301 Fronttube 400 Wingboard

Claims

Inflatable water sports equipment (300, 400) comprising at least one inflatable structure (301) with a drain valve (100) through which, in an open state of the drain valve (100), air can be released from an interior of the structure (301), the drain valve (100) comprising: - a valve housing (10) connected to the structure (301) and having a passage through which the air can be released from the interior; and - a valve closure (20) for closing the drain valve (100), the valve closure (20) and the valve housing (10) each having threaded sections adapted to each other for forming a threaded connection (30) between the valve closure (20) and the valve housing (10), and the drain valve (100) being able to be moved from a closed state to the open state by loosening the threaded connection (30), and one of the threaded sections (13;23) has at least one passage opening (31-1, 31-2) which, in the closed state, is closed by the respective other threaded section (23; 13) and which can be opened by partially loosening the threaded connection (30), such that air can be released from the interior through the passage and the at least one opened passage opening (31-1, 31-2), while the valve closure (20) is still in interaction with the valve housing (10) via the threaded connection (30). Inflatable water sports equipment (300, 400) according to claim 1, wherein the one threaded section (13; 23) which has the at least one passage opening (31-1, 31-2) is the threaded section (23) of the valve closure (20). Inflatable water sports equipment (300, 400) according to one of claims 1 or 2, wherein the at least one passage opening (31-1, 31-2) lies between two adjacent thread flanks of one thread section (13; 23) and penetrates the thread root of one thread section (13; 23), preferably the passage opening (31-1, 31-2) penetrates only the thread root. Inflatable water sports equipment (300, 400) according to one of claims 1 to 3, wherein the at least one passage opening (31-1, 31-2) extends continuously along a circumferential direction of one threaded section (13; 23) from a first end to a second end of the at least one passage opening (31-1, 31-2), wherein the first and the second end enclose an angle of 2° to 90°, in particular 5° to 45°, with respect to one threaded section (13; 23). Inflatable water sports equipment (300, 400) according to one of claims 1 to 4, wherein one of the threaded sections (13; 23) has two or more passage openings (31-1, 31-2) which are closed in the closed state by the respective other threaded section (23; 13) and which can each be opened by partially loosening the threaded connection (30) in such a way that air can be released from the interior through the passage and the respective opened passage opening (31-1, 31-2), while the valve closure (20) is still in interaction with the valve housing (10) via the threaded connection (30). Inflatable water sports equipment (300, 400) according to claim 5, wherein at least two of the passage openings (31-1, 31-2) are arranged on the one threaded section (13; 23) such that they are opened successively by a relative rotation of the valve closure (20) and the valve housing (10) to release the threaded connection (30). Inflatable water sports equipment (300, 400) according to claim 6, wherein the at least two passage openings (31-1, 31-2), which are opened successively by the relative rotation of the valve closure (20) and the valve housing (10), are arranged offset from one another in the circumferential direction and / or in the longitudinal direction of the one threaded section (13; 23) with respect to the one threaded section (13; 23). Inflatable water sports equipment (300, 400) according to claim 3 and claim 7, wherein the at least two passage openings (31-1, 31-2), which are opened successively by the relative rotation of the valve closure (20) and the valve housing (10), are arranged offset from one another in the longitudinal direction of the one threaded section (13; 23) with respect to the one threaded section (13; 23) and are separated by an intermediate thread flank. Inflatable water sports equipment (300, 400) according to one of claims 2 to 8, wherein both threaded sections (13, 23) each have at least one passage opening (31-1, 31-2) which is closed in the closed state by the respective other threaded section (13, 23) and which can be opened by partially loosening the threaded connection (30) in such a way that air can be released from the interior through the passage and the respective opened passage opening (31-1, 31-2), while the valve closure (20) is still in interaction with the valve housing (10) via the threaded connection (30). Inflatable water sports equipment (300, 400) according to one of claims 1 to 9 wherein the threaded section (23) of the valve closure (20) is designed as an internal thread and the threaded section (13) of the valve housing (10) is designed as an external thread. Inflatable water sports equipment (300, 400) according to one of claims 1 to 10, wherein the threaded section (13) of the valve housing (10) is designed as an internal thread and the threaded section (23) of the valve closure (20) is designed as an external thread. Inflatable water sports equipment (300, 400) according to one of claims 1 to 11, wherein the drain valve (100) comprises a sealing element (14) which is clamped between the valve closure (20) and the valve housing (10) in the closed state. Inflatable water sports equipment (300, 400) according to one of claims 1 to 11, wherein the valve closure (20) comprises one or more stop sections (22) adapted to a stop (14) of the valve housing (10) such that, after complete loosening of the threaded connection (30), they limit a translational displacement of the valve closure (20) relative to the valve housing (10) when they are brought into interaction with the stop (14). Inflatable water sports equipment (300, 400) according to claim 13, wherein the valve closure (20) comprises at least two stop sections (22) which are formed at respective ends of web sections (21) extending from the threaded section (23) of the valve closure (20) in the longitudinal direction of the threaded section (23). A drain valve (100), in particular a drain valve (100) of an inflatable water sports device (300, 400) according to one of claims 1 to 14, through which air can be drained from an interior of an inflatable structure (301) in an open state of the drain valve (100), comprising: - a valve housing (10) that is connectable to the structure (301) and has a passage, and - a valve closure (20) for closing the passage, wherein the valve closure (20) and the valve housing (10) each have threaded sections (13, 23) adapted to each other for creating a threaded connection (30) between the valve closure (20) and the valve housing (10), and the drain valve (100) can be moved from a closed state to the open state by loosening the threaded connection (30), and one of the threaded sections (13;23) has at least one passage opening (31-1, 31-2) which, in the closed state, is closed by the respective other threaded section (23; 13) and which can be opened by partially loosening the threaded connection (30), such that, in a state connected to the structure (301), air can be released from the interior through the passage and the at least one opened passage opening (31-1, 31-2), while the valve closure (20) is still interacting with the valve housing (10) via the threaded connection (30).

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