Drain valve for a container

Abstract

A drain valve (1) for a container, for example a washbasin, a bathtub or shower tray, comprises a rotatable closure element (3) with a vertical axis of rotation, which rests on a drain piece (2) fixed to the container and which selectively closes or opens a drain opening (6) provided by the drain piece (2). By means of interacting contours of the closure element (3) and of the drain piece (2), a rotation of the closure element (3) is coupled to a vertical movement of the same element (3), and preferred positions of the closure element (3) are provided in which rotation of the closure element (3) is inhibited. The closure element (3) can be rotated in both directions of rotation out of the preferred positions.

Description

[0001] The invention relates to a drain valve suitable for a container, for example a washbasin or a bathtub, according to the preamble of claim 1.

[0002] A drain valve described in DE 10 2020 004 474 A1 for sanitary facilities such as washbasins, sinks, and bathtubs comprises a rotatably mounted shut-off disc through which a drain opening can be closed or opened. A linear motor is provided to actuate the drain valve according to DE 10 2020 004 474 A1.

[0003] JP 2010-162097 A relates to a drain valve for a container, which comprises a rotatable closure element with a vertical axis of rotation resting on a drain piece fixed to the container. This closure element has a locking mechanism that allows the closure element to be released from a locking position, in which it rests in a lowered position on the drain piece, by rotating it in a defined direction.

[0004] A drain valve disclosed in EP 3 276 095 B1 is used to throttle the flush flow from a sanitary cistern. This drain valve also comprises two disc-shaped, mutually rotatable throttle elements.

[0005] US 2022 / 0042292 A1 concerns a bathtub drain with a so-called lift-and-turn mechanism. The mechanism according to US 2022 / 0042292 A1 includes, among other things, a spring and a magnet.

[0006] Further closure mechanisms for drains are described, for example, in documents CA 2 659 992 A1 and DE 10 2007 008 376 A1. In the latter case, a closure element can be moved from an open position to a closed position by means of an electromagnetic drive device.

[0007] EP 3 839 157 B1 discloses a drain fitting designed for a sanitary bathtub or shower tray, which includes a drain body and a cover. A flange on the drain body is provided with projections that interact with the contours of the cover to prevent the cover from rotating around a vertical axis.

[0008] The invention is based on the object of providing a drain valve for sanitary facilities such as washbasins, bathtubs or shower trays that is further developed compared to the prior art, has a compact design and is easy to operate.

[0009] This object is achieved according to the invention by a drain valve having the features of claim 1. The drain valve comprises a rotatable closure element with a vertical geometric axis of rotation resting on a container-fixed drain piece. Depending on the setting of the closure element, a drain opening provided by the drain piece is optionally closed or opened, wherein the interacting contours of the closure element and the drain piece couple a rotation of the closure element with a vertical movement of the same element. In this case, preferred positions of the closure element exist. A preferred position is understood to be a setting of the closure element in which its rotation is inhibited. This means that further rotation of the closure element from a preferred position is opposed by a greater braking moment than in other angular positions of the closure element.The locking element can be rotated in both directions from the preferred positions. Removing the locking element from the preferred position by rotating it in a first direction may require the same or a different torque than rotating it in the opposite direction. The mechanical relationship between the angular position and stroke of the locking element is achieved in all cases without a central guide element, such as a threaded rod.

[0010] The raising and lowering of the closure element along a defined path is achieved by the directly interacting contours of the closure element on the one hand and the drain piece on the other. In a typical design, direct manual actuation, i.e. rotation, of the closure element is provided. This means that the closure element is also designed as a rotatable actuating element for the drain valve. For this purpose, recessed grips are optionally formed in the edge area of ​​the closure element. Additionally or alternatively, roughening of the surface of the closure element is also possible. A rotation angle limitation between the drain piece and the closure element, i.e. a stop acting in the circumferential direction, does not exist in a typical design. This means that the closure element is alternately raised and lowered with unlimited rotation.

[0011] The contour of the outlet piece, which causes the closure element to lift when rotated, describes, for example, a sinusoidal shape, i.e. the shape of a wave running around the entire circumference of the outlet piece. In general, this contour represents a ramp contour. The ramp contour, in particular a sinusoidal contour, has, according to various possible designs, for example at least two and at most ten troughs and a corresponding number of crests. Regardless of the number of troughs and crests, the crests can also form peaks, deviating from a sinusoidal shape. These peaks can in particular be followed by flanks which are of unequal length and thus also inclined to different degrees. The troughs can also be rounded in variants with pointed crests. The asymmetry of the flanks of the ramp contour can specify a preferred direction of rotation of the closure element.

[0012] Various possible designs provide for the drain piece to interact with the closure element in a force-locking manner in the preferred positions. In particular, radial forces can act between the drain piece and the closure element.

[0013] Optionally, a positive engagement between the drain piece and the closure element is also provided. Such engagement can be accompanied by an elastic deformation of the positive engagement contours, particularly of the closure element.

[0014] Particularly in variants where no additional form-fitting contours are present, the drain piece and / or the closure element can have a non-circular shape, which, for example, is a shape that deviates from a circular cylindrical shape and approximates a polygonal shape. For example, an inner peripheral surface of the drain piece describes such a shape, referred to simply as a polygonal shape, whereas the closure element has several feet that, in the preferred positions, clamp against sections of the inner peripheral surface.

[0015] Design of the closure element with multiple feet is also possible in drain valve variants in which no transmission of radial forces between the drain piece and the closure element is provided. The individual feet or multiple support segments of the closure element can be supported in a variety of ways on the sinusoidal contour of the drain piece. In this way, any rotation of the closure element is converted into smooth, jerk-free vertical movements of the closure element. The angular positions of the closure element, in which it is either maximally raised or completely lowered, are preferably evenly distributed.For example, if, as already mentioned, there are two to ten maximum raised and the same number of maximum lowered positions of the closure element, the angular distance between a maximum raised and a maximum lowered, i.e. sealing, position of the closure element is 30 to 90 degrees.

[0016] Various designs of the drain valve provide for the closure element to be fixed in place only in its raised position, either force-locked or positively locked. In the lowered position, however, the closure element rests on the drain piece solely by gravity.

[0017] In the preferred positions, namely the open positions, a flat section of the closure element, in particular in the form of the underside of a foot, can, for example, lie in a likewise at least partially flat recess formed in the region of a wave crest of the ramp contour of the outlet piece. Likewise, configurations are possible in which a concave contour of a foot rests on a convexly curved contour of the outlet piece. Alternatively, a convex contour of a foot can rest on a concavely curved contour of the outlet piece.

[0018] The effect of the aforementioned convex or concave, and sometimes even flat, contours, which fix the closure element in the preferred positions, can be supplemented or replaced by locking contours, which are present as contour pairs, designed, for example, as knobs and associated depressions or as webs and associated grooves. In this case, for example, the raised structures, i.e., knobs or webs, are located on the closure element, in particular on the feet, while the associated negative structures are formed in the outlet piece. Likewise, there are designs in which the outlet piece is provided with positive structures, for example in the form of knobs and / or webs, whereas the closure element has the associated negative structures. Finally, both positive and negative structures can be formed on both the closure element and the outlet piece.

[0019] The object underlying the invention is further achieved by a drain valve having the features of claim 19. This drain valve constructed according to the preamble of claim 1 is characterized in that the closure element is magnetically fixed at least in its open position, the closure element is also designed as a manually operable actuating element, the closure element is rotatable relative to the outlet piece without angular limitation, a wave-shaped ramp contour which interacts with the closure element is formed by the outlet piece, the closure element has a plurality of feet which are supported on the ramp contour, the feet each have a hollow space provided for receiving a magnetically active element, the outlet piece has blind hole-like magnet receptacles into which permanent magnets are directly inserted, which are provided for the interaction with the elements located in the hollow spaces to fix the closure element.

[0020] As regards geometric features of the drain piece and the closure element of the drain valve according to claim 19, any features already explained in connection with the embodiment according to claim 1 can be adopted.

[0021] The drain valve according to claim 19, closely based on the drain valve according to claim 1, comprises a rotatable closure element with a vertical geometric axis of rotation resting on a container-fixed drain piece. Depending on the setting of the closure element, a drain opening provided by the drain piece is selectively closed or opened by the closure element. By virtue of interacting contours of the closure element and the drain piece, a rotation of the closure element is coupled to a vertical movement of the same element, and the closure element is magnetically fixed at least in its open position. The mechanical association between the angular position and stroke of the closure element also takes place in the drain valve according to claim 19 without a central guide element, for example in the form of a threaded rod.

[0022] The raising and lowering of the closure element, which is part of the drain valve according to claim 19, along a defined path is not effected by magnetic forces, but rather by the directly interacting contours of the closure element on the one hand and the drain piece on the other. Regarding the mechanism for rotating and raising or lowering the closure element, reference is made to the statements relating to claim 1.

[0023] The contour of the outlet piece, which causes the closure element to lift when it is rotated, can also describe a sinusoidal shape in the embodiment according to claim 19, i.e. the shape of a wave running around the entire circumference of the outlet piece. Just as in the embodiment according to claim 1, wave crests in the embodiment according to claim 19 can also be pointed, with asymmetrically shaped flanks adjoining the peaks. In general, this contour represents a ramp contour. The ramp contour, in particular a sinusoidal contour, has, according to various possible embodiments, for example at least two and at most ten, in particular at most six, wave troughs as well as a corresponding number of wave crests.

[0024] Individual feet of the closure element are supported on the sinusoidal contour of the drain piece in various configurations according to claim 1 and / or claim 19. In this way, any twisting of the closure element is converted into smooth, jerk-free vertical movements of the closure element.

[0025] Simple embodiments of the drain valve according to claim 19 provide that the closure element is magnetically fixed only in its raised positions. In the lowered state, however, the closure element rests on the drain piece solely by gravity. In more advanced variants, magnetic fixation is additionally provided in the lowered positions. In both cases, permanent magnets are inserted directly into blind-hole-like receptacles in the drain piece. The receptacles can, for example, have a circular, rectangular, or other cross-sectional shape. The permanent magnets, which are held in or on the drain piece, interact magnetically with elements inserted into the feet of the closure element, whereby the number of magnets does not necessarily correspond to the number of troughs in the ramp contour of the drain piece, and in particular can be fewer than the number of troughs.

[0026] In all versions, the drain valve is characterized by a minimal number of moving parts and an extremely easy-to-clean design. Contours where dirt can accumulate or hair can become trapped are virtually nonexistent. Optionally, the closure element is equipped with a seal that rests on the drain piece when closed. The seal is held, for example, between a lower part that interacts directly with the ramp contour of the drain piece and an upper part of the closure element.

[0027] Several embodiments of the invention are explained in more detail below with reference to a drawing. In the drawings: Fig. 1 a drain valve for a tub or basin in a partially sectioned perspective view, Fig. 2 a closure element of the drain valve according to Figure 1 , Fig. 3 a drain piece of the drain valve according to Figure 1, Fig. 4 the shape of a non-circular inner wall of the drain piece according to Figure 3 in an exaggerated representation, Fig. 5 to 7 the interaction between feet of the closure element according to Figure 2 and the inner circumferential surface Figure 4 in different angular positions of the closure element, Fig. 8 to 10 a compared to the embodiment according to Figure 1 modified interaction between feet of a closure element and a ramp contour of a drain piece, Fig. 11 and 12 another possible contour design of feet of a closure element and an associated ramp contour, Fig. 13 and 14 concave-convex contour pairings of components of a drain valve in representations analogous Figures 11 and 12 , Fig. 15 to 17 Contour pairings of a closure element and a drain piece of a drain valve in the form of a web on a ramp contour and an associated groove on the underside of a foot of a closure element in representations analogous Figures 8 to 10, Fig. 18 to 20 a drain valve with compared to the embodiment according to the Figures 15 to 17 modified locking contours, namely pairs of knobs and depressions, Fig. 21 to 23 in comparison to the embodiment according to Figure 1 further developed drain valve, which has locking contours on an inner circumferential surface of a drain piece, Fig. 24 a further embodiment of a drain valve, comprising a drain piece with a ramp contour having several peaks, Fig. 25 a drain valve comprising several magnets for a tub or basin in a sectional view, Fig. 26 the drain valve according to Fig. 25 in perspective view.

[0028] Unless otherwise stated, the following explanations refer to all embodiments. Corresponding or essentially equivalent parts are identified by the same reference numerals in all figures.

[0029] A drain valve, designated overall by reference numeral 1, is particularly suitable for use in a washbasin or in a shower or bathtub. Components of the drain valve 1 include a drain piece 2, which is inserted into the container base, and a closure element 3. The tubular drain piece 2 is provided with an external thread 4. A conical end portion 5 of the drain piece 2 is located above the external thread 4. The drain opening provided by the drain piece 2 is designated 6.

[0030] Viewed in the longitudinal direction of the drain piece 2, that is to say in the vertical direction, between the section of the drain piece 2 provided with the external thread 4 and its end region 5, as can be seen inter alia from Fig. 1As can be seen, a wave-shaped, i.e., sinusoidal, ramp contour 7 is formed. Several feet 8 of the closure element 3 are supported on the ramp contour 7. The feet 8, in the present case three each, thus represent a counter-contour to the ramp contour 7.

[0031] Above the ramp contour 7, especially in the Figures 1 , 3 , 8 , 11 , 13 , 15 , 18 and 21an at least approximately circular-cylindrical inner peripheral surface 9 of the drain piece 2 can be seen. Adjoining the upper edge of the inner peripheral surface 9 is a sealing cone 10, on which a seal 11 rests when the closure element 3 is lowered. The seal 11 is located on the closure element 3. The upper side of the drain piece 2 is in the form of a conical surface 12. The spherically curved cover surface of the closure element 3 is designated 13. In a modified embodiment, the closure element 3 has a flat cover surface.

[0032] In all embodiments, the drain valve 1 can be easily opened and closed by manually grasping its cover surface 13 and rotating it around its central axis, designated MA, which also represents the vertical central axis of the drain piece 2. There is no stop effective in the direction of rotation.

[0033] In the example according to the Figures 1 to 7the inner peripheral surface 9 has a non-circular cross-sectional shape, as can be seen in particular from Fig. 4 in an exaggerated representation. The inner circumferential surface 9 therefore describes a modified polygon profile PgP. In addition, Fig. 4 Two circular profiles, namely an outer comparison profile VP a and an inner circular profile VP i , are drawn, whereby the comparison profiles VP a , VP i are tangent to the so-called polygon profile PgP from the outside and from the inside, respectively. The three feet 8 are equidistant from the central axis MA of the closure element 3. This means that, depending on the angular position of the closure element 3, the feet 8 either rest against the inner circumferential surface 9 in a clamping manner, which represents a preferred position of the closure element 3, or are slightly lifted from the inner circumferential surface 9. As can be seen from the Figures 5 to 7 As can be seen, the clamping effect desired in a preferred position is in the 30° position ( Fig. 6), whereas in the 0° position and in the 60° position ( Fig. 5, Fig. 7 ) no braking moment acts between the closure element 3 and the outlet piece 2. The 30° position is a raised position of the closure element 3; in the 0° position, the closure element 3 is completely lowered, just as in the 60° position.

[0034] In the example according to the Figures 8 to 10 The inner circumferential surface 9 has a circular-cylindrical shape. The transmission of radial forces between the feet 8 and the outlet piece 2 is not provided in any angular position of the closure element 3. Instead, recesses are formed on the wave crests of the ramp contour 7, into which the foot 8 can be inserted, thus forming a locking contour 20. The undersides of the feet 8 are flat in this case.

[0035] In contrast to the embodiment according to the Figures 8 to 10 are in the example according to the Figures 11 and 12the undersides of the feet 8 are slightly convex, wherein in cooperation with a slightly concave counter-contour, which is provided by the ramp contour 7 centrally in a wave crest, a locking contour 20 is also formed in this case, with which the closure element 3 is held in the preferred position.

[0036] The Figures 13 and 14 show a design that has optical similarities with the embodiment according to Fig. 1 However, in the design according to the Figures 13 and 14 the inner circumferential surface 9 is circular-cylindrical, so that no angular position of the closure element 3 leads to a clamping of this element in the outlet piece 2. The underside of each foot 8 is in the case of Figs. 13 and 14 is concavely curved. A convex counter-contour is already present due to the wave shape of the ramp contour 7. Only in the Figures 13 and 14In the preferred position shown, the underside of each foot 8 rests flat on the ramp contour 7.

[0037] The design according to the Figures 15 to 17 differs from the design according to the Figures 13 and 14 in that a web 18 integrated into the ramp contour 7 additionally contributes to the stability of the locking contour 20, which web engages in a groove 19 on the underside of the foot 8 in the preferred position of the closure element 3.

[0038] A design according to the Figures 15 to 17 A comparable effect is included in the design according to the Figures 18 to 20 In this case, a knob 16 is formed centrally in the wave crest of the ramp contour 7, which can engage in a corresponding recess 17 on the underside of the foot 8.

[0039] The embodiment according to the Figures 21 to 23 is based on the embodiment according to Fig. 1This means that in this case too, the inner circumferential surface 9 describes a rounded polygonal profile PgP. In addition, there are 7 studs 14 on the inner circumferential surface 9 above the wave crests of the ramp contour. The studs 14 are thus directed radially inwards. In the preferred positions, each stud 14 engages in a lateral recess 15 on a foot 8. This is possible due to the slight deformability of the feet 8. The squeezing effect, which is already evident in the embodiment according to Fig. 1 is thus supported by the locking contour 20, which in this case is in the form of the knobs 14 and depressions 15.

[0040] The embodiment according to Fig. 24 differs from the embodiment according to Fig. 1 among other things by the shape of the ramp contour 7. As can be seen from Fig. 24As can be seen, the wave crests are formed as peaks 21, which are followed by flanks 22, 23 of unequal length and angled to different degrees, thus creating an asymmetry of the ramp contour 7. The wave troughs of the ramp contour, designated 28, on the other hand, also have Fig. 24 a rounded shape.

[0041] How next Fig. 24 As can be seen, in this case the closure element 3 forms an upper disc 24, through which the cover surface 13 is provided, and a lower disc 25 parallel to the upper disc 24. A circumferential groove 26 can be seen between the two discs 24, 25.

[0042] The feet 8 are integrally formed on the lower disc 25. Each foot 8 has two protrusions 27 on its underside, between which the groove 19 is formed. When the closure element 3 is in its locked position, raised to its maximum distance from the outlet piece 2, the tips 21, which—viewed three-dimensionally—are present as radially outward-facing edges, each engage in a groove 19 of a foot 8. This provides a particularly stable mounting of the closure element 3 on the outlet piece 2.

[0043] The variant of the drain valve 1 according to the Figures 25 and 26 differs from the variants explained above by a magnetic fixing mechanism. The drain valve is also particularly suitable for use in a washbasin or in a shower or bathtub. Components of the drain valve 1 are, as in the embodiments according to the Figures 1 to 24, a drain piece 2, which is to be inserted into the bottom of the container, and in the case of Figures 25 and 26 closure element constructed in several parts as described in more detail below 3.

[0044] The tubular drain piece 2 is provided, as in other embodiments, with an external thread 4. Above the external thread 4 is a conical end portion 5 of the drain piece 2.

[0045] In the transition area between the section of the drain piece 2 provided with the external thread 4 and its end area 5, as can be seen from Fig. 25 As can be seen, the wave-shaped, i.e., sinusoidal, ramp contour 7 is formed. Several feet 8 of the closure element 3 are supported on the ramp contour 7. The feet 8, in this case three, thus represent a counter-contour to the ramp contour 7.

[0046] As from Fig. 25As can be seen further, the feet 8 are directed obliquely downwards, being formed by a lower part 35 of the closure element 3. In an alternative embodiment not shown, the feet 8 can also be oriented radially, i.e. horizontally, or axially, i.e. vertically.

[0047] Between the lower part 35 and an upper part of the closure element 3, designated by 29, there is a seal 30 which is intended to rest on the conical inner surface, designated by 31, of the closure area 5 in the closed state of the drain valve 1. The spherically curved cover surface of the upper part 29 and thus of the entire closure element 3 is also in the case of Figures 25 and 26 designated 13. In a modified embodiment, the upper part 29 has a flat cover surface.

[0048] The drain valve 1 can be easily opened and closed by manually grasping its cover surface 13 and rotating it around its central axis MA, which also represents the vertical central axis of the drain piece 2. There is no stop effective in the direction of rotation.

[0049] In order to fix the closure element 3 in a defined position, permanent magnets (not shown) are inserted into blind hole-shaped magnet receptacles 32, 33, which are located partly in the external thread 4, partly at the upper edge of the external thread 4. In the embodiment according to Fig. 25 The closure element 3 can be magnetically secured in both its raised and lowered positions. In a simplified embodiment not shown, magnetic fixation is provided only in the raised position of the closure element 3.

[0050] Counterparts that interact with the permanent magnets located in the magnet receptacles 32, 33, which can be either additional magnets or ferromagnetic metal pieces, are inserted into cavities 34, each of which is located in a base 8. Furthermore, the lower part 35 is made of plastic in this case. The remaining components of the drain valve 1 can also be made of plastic, optionally in a metallized version, or of metallic materials. List of reference symbols

[0051] 1 Drain valve 2 Drain piece 3 Closure element 4 External thread 5 Conical end area 6 Drain opening 7 Ramp contour 8 Foot 9 Inner peripheral surface 10 Sealing cone 11 Seal 12 Conical surface 13 Cover surface 14 Stud on the inner peripheral surface 15 Lateral recess 16 Stud on the ramp contour 17 Recess on the underside of the foot 18 Web on the ramp contour 19 Groove on the underside of the foot 20 Locking contour 21 Tip 22 Flank 23 Flank 24 Upper disc 25 Lower disc 26 Circumferential groove 27 Hump 28 Trough 29 Upper part 30 Seal 31 Conical inner surface 32 Magnetic receptacle 33 Magnetic receptacle 34 Cavity 35 Lower part MACenter axis PgPPolygon profile VP a outer comparison profile VP i inner comparison profile

Claims

1. Drain valve (1) for a container, comprising a rotatable closure element (3) with a vertical axis of rotation, which closure element rests on a container-fixed drain piece (2) and selectively closes or opens a drain opening (6) provided by the drain piece (2), wherein a rotation of the closure element (3) is coupled to a vertical movement of the same element (3) by means of interacting contours of the closure element (3) and the drain piece (2), characterized in that Preferred positions of the closure element (3) are provided in which rotation of the closure element (3) is inhibited, wherein the closure element (3) can be rotated in both directions of rotation out of the preferred positions.

2. Drain valve (1) according to claim 1, characterized in that the closure element (3) is also designed as a manually operable actuating element, wherein the drain opening (6) is open at least in one of the preferred positions of the closure element (3).

3. Drain valve (1) according to claim 2, characterized in that the closure element (3) can be rotated relative to the outlet piece (2) without any angular limitation.

4. Drain valve (1) according to claim 3, characterized in that a wave-shaped ramp contour (7) is formed by the drain piece (2) and interacts with the closure element (2).

5. Drain valve (1) according to claim 4, characterized in that the ramp contour (7) has at least two and at most ten wave troughs and a corresponding number of wave crests.

6. Drain valve (1) according to claim 5, characterized in that peaks (21) are formed by the wave crests of the ramp contour (7).

7. Drain valve (1) according to claim 6, characterized in that flanks (22, 23) of unequal length are connected to each tip (21).

8. Drain valve (1) according to one of claims 1 to 7, characterized in that the drain piece (2) interacts force-fittingly with the closure element (3) in the preferred positions.

9. Drain valve (1) according to claim 8, characterized in that the drain piece (2) additionally interacts positively with the closure element (3) in the preferred positions.

10. Drain valve (1) according to claim 8 or 9, characterized in that the drain piece (2) has an inner circumferential surface (9) which deviates from a circular cylindrical shape and approximates a polygonal shape and which interacts directly with the closure element (3).

11. Drain valve (1) according to one of claims 4 to 10, characterized in that the closure element (3) has several feet (8) which are supported on the ramp contour (7).

12. Drain valve (1) according to claim 11, characterized in that in the preferred positions, namely open positions, a concave contour of a foot (8) rests on a convexly curved contour of the outlet piece (2).

13. Drain valve (1) according to claim 11, characterized in thatin the preferred positions, namely open positions, a convex contour of a foot (8) rests on a concavely curved contour of the drain piece (2).

14. Drain valve (1) according to claim 11, characterized in that in the preferred positions, namely open positions, a flat surface of a foot (8) engages in a contour of the drain piece (2).

15. Drain valve (1) according to one of claims 11 to 14, characterized in that in the preferred positions, the feet (8) of the closure element (3) are held in place on the drain piece (2).

16. Drain valve (1) according to claim 15, characterized in that Locking contours (20) of the closure element (3) and of the drain piece (2) are formed by contours on the underside of the feet (8) and within the ramp contour (7).

17. Drain valve (1) according to claim 16, characterized in that the locking contours (20) are formed by pairs of knobs (16) and depressions (17).

18. Drain valve (1) according to claim 16, characterized in that the locking contours (20) are formed by pairs of webs (18) and grooves (19).

19. Drain valve (1) according to the preamble of claim 1, characterized in thatwhich - the closure element (3) is magnetically fixed at least in its open position, - the closure element (3) is also designed as a manually operable actuating element, - the closure element (3) is rotatable relative to the outlet piece (2) without angular limitation, - a wave-shaped ramp contour (7) which interacts with the closure element (2) is formed by the outlet piece (2), - the closure element (3) has a plurality of feet (8) which are supported on the ramp contour (7), - the feet (8) each have a hollow space (34) provided for receiving a magnetically active element, - the outlet piece (2) has blind hole-like magnet receptacles (32, 33) into which permanent magnets are directly inserted, which are provided for interacting with the elements located in the hollow spaces (34) to fix the closure element (3).

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