Patent Publication Number: US-11649622-B2

Title: Drain arrangement

Description:
TECHNICAL FIELD 
     The present invention relates to a drain arrangement for a washstand according to claim  1 . 
     PRIOR ART 
     Drain arrangements for washstands are known from the prior art. For example, EP 2 119 837 discloses a drain arrangement with an outflow valve and an adjoining outflow pipe. The multiple diversion of the outflow pipe has the disadvantage that the hydraulic outflow performance could be inadequate. 
     Various requirements for drain arrangements emerge from the prior art. For example, the hydraulic outflow performance is a key feature of a drain arrangement. This applies in particular during normal use, but also for an emergency overflow function. A further requirement is the compactness of a drain arrangement, so that the latter takes up only little installation space. Typically, there is a conflict of objectives between the required compactness and the hydraulic outflow performance, which normally necessitates relatively large installation spaces. 
     SUMMARY OF THE INVENTION 
     Taking this prior art as a starting point, the invention is based on the objective of specifying a drain arrangement which overcomes the disadvantages of the prior art. In particular, an object of the present invention is to specify a drain arrangement which, in particular with the condition of a good hydraulic outflow performance, is designed to be as compact as possible. 
     A drain arrangement according to claim  1  achieves this object. Accordingly, a drain arrangement for connection to a sanitary item comprises a drain valve housing which has a first channel section with an inlet opening, has a second channel section with an outlet opening, and has a valve seat situated between the inlet opening and the outlet opening, a valve body which is movable from the valve seat from a closed position into an open position, an actuating unit by way of which the valve body is movable, and an outflow pipe into which the second channel section opens by way of the outlet opening thereof. A first central axis extends centrally through the first channel section, and an outflow pipe central axis extends centrally through the outflow pipe. In one variant, the outflow pipe central axis intersects the first central axis. In another variant, the outflow pipe central axis is at a distance from the first central axis, wherein the distance corresponds at most to half the diameter of the outlet opening. Furthermore, the actuating unit has an actuating lever, which acts on the valve body, and an actuator element for actuating the actuating lever, wherein the actuator element, at least over a section, extends laterally alongside the outflow pipe. 
     The lateral arrangement of the actuator element yields the advantage that a compact structure can be provided. That is to say that the height of the drain arrangement can be minimized, which reduces the space required below the sanitary item. 
     The lateral arrangement yields the further advantage that the water flowing away through the drain valve housing is diverted only between the first channel section and the second channel section and then, in one variant, flows directly into the outflow pipe and, in the other variant, undergoes only a small diversion on account of the offset of the first central axis with respect to the outflow pipe central axis. The loss in terms of flow that arises, as is known from the prior art, due to 90° bends can thus be avoided. 
     The expression “laterally alongside the outflow pipe” is to be understood as meaning that, in the installation position, the actuator element is situated alongside the outflow pipe and extends alongside the outflow pipe. 
     As seen in the installation position, the first central axis of the first channel section is substantially vertical or in the plumb line direction. 
     The second channel section has a second central axis, which extends centrally through the second channel section. The first central axis is at an angle of at least 90° to the second central axis or to the outflow pipe central axis. Particularly preferably, angles are between 90° and 95°. In the installation position, the second central axis or the outflow pipe central axis is therefore horizontal or slightly downwardly inclined with respect to the horizontal. 
     Preferably, the outflow pipe central axis is oriented so as to be substantially parallel to, in particular collinear with respect to, the second central axis. 
     Preferably, the valve seat is situated in the first channel section. The valve seat extends about the first central axis. 
     Preferably, the actuator element is mounted in a bearing point situated on the outside of the drain valve housing, wherein the bearing point has a bearing opening for the passing-through of the actuator element. Here, the mounting is such that the actuator element is movable relative to the fixed bearing arrangement. 
     The bearing point is preferably formed integrally on the drain valve housing. The bearing point may however also be arranged on a separate element which can be connected to the drain valve housing. 
     The bearing point is situated laterally on the drain valve housing. 
     Preferably, in the installation position, the bearing point or the bearing opening is situated at a height which is central with respect to the outflow pipe. 
     Preferably, the actuator element is situated spaced apart laterally at a distance from the lateral surface of the outflow pipe, wherein the distance is less than the outer diameter of the outflow pipe, or wherein the distance is less than half the outer diameter of the outflow pipe. 
     The small distance from the outflow pipe yields the advantage that the required structural space of the drain valve arrangement in terms of its width can be minimized. 
     Preferably, the actuating lever has a lever axle, wherein the actuating lever is pivotable around the lever axle, and wherein the lever axle extends at right angles to the first central axis and to the second central axis. 
     Particularly preferably, as seen in the installation position, the lever axle is situated below the outflow pipe central axis. 
     Preferably, the lever axle is mounted in a bearing point in a side wall of the outflow housing, wherein the lever axle projects out of the outflow housing, and wherein the lever axle has, in particular at an end side, a lever projection with an articulation point on which the actuator element acts. 
     Preferably, the actuating lever has a lever arm which acts on the valve body. The lever arm projects away from the lever axle and is situated in the first and/or in the second channel section. 
     The position of the actuator element may be specified via a structural space. Preferably, the actuator element is situated in the structural space, wherein the structural space extends laterally with respect to the outflow pipe. 
     The expression “structural space” is to be understood as meaning a spatial region in which the actuator element is arranged. 
     Preferably, the lever projection is situated in a structural space, which structural space extends laterally with respect to the outflow pipe. 
     Preferably, the structural space is bounded laterally by the outer side of the outflow pipe and by a vertical plane. The vertical plane, in the installation position, extends vertically and is spaced apart from the lateral surface of the outflow pipe at a distance of at most the outer diameter of the outflow pipe or of at most half the outer diameter of the outflow pipe. The vertical plane is parallel to the first central axis and parallel to the second central axis or to the outflow pipe central axis. In a particularly preferred embodiment, the distance is 10 to 20 millimetres. 
     Preferably, the structural space may be bounded downwardly by a lower plane. The lower plane extends at right angles to the vertical plane and extends through a lower lateral surface line, which forms the line of intersection of a central plane, extending through the outflow pipe central axis and vertically, with the pipe outer side. 
     The structural space may be bounded upwardly by an upper plane. The upper plane extends at right angles to the vertical plane and extends through an upper lateral surface line, which forms the line of intersection of a central plane, extending through the outflow pipe central axis, with the pipe outer side. 
     Preferably, the actuator element is an actuating rod or a cable. 
     Preferably, the outflow pipe extends along a straight line without curvature. Preferably, a siphon element follows the outflow pipe opposite the second channel section. 
     Preferably, the outflow pipe has a length of greater than 300 millimetres. 
     The drain arrangement furthermore comprises an overflow unit, wherein the overflow unit has a first connecting pipe, an overflow pipe and a second connecting pipe. The first connecting pipe is led, from an upper mouth opening, out of the first channel section from above the valve seat. Furthermore, the first connecting pipe opens into the overflow pipe, which, in the installation position, extends upwards substantially counter to the plumb-line direction. The overflow pipe then opens, below the first connecting pipe, into the second connecting pipe, which opens, below the valve seat, into the first channel section, and/or the second channel section, via a lower mouth opening. 
     Both the outlet opening and the mouth openings are arranged at the outflow housing laterally with respect to the outflow valve housing, in such a way that, as seen in the installation position, the outflow pipe and the connecting pipes extend substantially next to one other. 
     The lateral arrangement of the mouth openings at the outflow valve housing and the lateral arrangement of the outlet opening at the outflow valve housing, with the associated arrangement of the outflow pipe, yields the advantage that the required structural height of the drain arrangement can be minimized. In particular, it is possible to minimize the structural space from the sanitary item downwards, whereby the space below the sanitary item and the drain arrangement can be better used by a base cabinet or some other structure. 
     The expression “laterally with respect to the outflow valve housing” is to be understood as meaning that the mouth openings and the outlet opening are situated in a side wall of the outflow valve housing. 
     Preferably, the mouth openings are provided by in each case one mouth channel section, which mouth channel section extends in a manner inclined at an angle, in particular at an angle of 45° to 135°, particularly preferably at an angle of 90°, to the outflow pipe central axis. 
     In other words, the mouth channel sections each extend along a mouth central axis. The mouth central axes are inclined at an angle, in particular at an angle of 45° to 135°, particularly preferably at an angle of 90°, to the pipe central axis. 
     Preferably, the mouth openings are delimited at a face side by side edges. The side edges of the mouth openings lie in a common plane, which is parallel or at an angle of at most 45° to a central plane extending through the first central axis and the pipe central axis. 
     Preferably, the two connecting pipes extend laterally alongside and spaced apart from the outflow pipe, wherein, as seen in the installation position from above, the connecting pipe central axes are parallel to the outflow pipe central axis. 
     As seen from the side, the connecting pipe central axes may be parallel or inclined at an angle to the outflow pipe central axis. 
     Preferably, the connecting pipes each project with a pipe section into the mouth openings. 
     Preferably, a seal is arranged between the pipe section and the mouth opening. 
     Preferably, the seal has a section which is exposed in the mouth opening, wherein the section is in the form of an angled surface. In this way, a flow-optimized contour can be provided. 
     Preferably, a diversion section is provided between the mouth opening and the respective connecting pipe, wherein the diversion section is part of the mouth opening and/or part of the connecting pipe. By way of the diversion section, a diversion is achieved such that the two connecting pipes are able to extend laterally alongside the outflow pipe. 
     Preferably, in the installation position, the connecting pipe central axes are inclined at an angle with respect to a horizontal plane, wherein the connecting pipes descend towards the mouth openings. This yields the advantage that, in the case of an emergency overflow, the lower connecting pipe is formed with a downward incline, with the result that a good outflow can be provided. 
     Preferably, before the entry into the first channel section, the second connecting pipe and/or the lower mouth opening have/has a shoulder which is oriented downwards in the direction of gravitational force. By way of said shoulder, it is achieved that the connecting pipe, in the installation position, may be situated slightly higher. Furthermore, flow over the shoulder results in a slightly higher flow speed being achieved, which is a great advantage for the outflow. 
     The two connecting pipe central axes are preferably parallel to one another. 
     Preferably, the two connecting pipes are formed integrally with one another. 
     Preferably, the overflow pipe may be connected to the connecting pipes via a plug-in connection. The plug-in connection may furthermore have a seal. 
     The overflow unit is situated in a structural space, which structural space extends laterally with respect to the outflow pipe and in the upward direction. In the installation position, the structural space is bounded downwardly by a lower plane. The lower plane extends at right angles to a central plane, which is spanned by the first central axis and the second central axis. The lower plane furthermore extends through a lower lateral surface line, which forms the line of intersection of a vertical plane, extending through the outflow pipe central axis and vertically, with the pipe outer side. This arrangement has the advantage that a compact structure can be provided in relation to the structural height beneath the sanitary item. 
     The expression “structural space” is to be understood as meaning a spatial region in which the overflow unit is arranged. 
     Preferably, the actuator element is situated on one side of the outflow pipe, and the two connecting pipes and also the overflow pipe are situated on the other side of the outflow pipe. 
     Preferably, the mouth openings are, in relation to a central plane spanned by the first central axis and the second central axis, situated opposite the actuator element. 
     Further embodiments are specified in the dependent claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Preferred embodiments of the invention will be described below on the basis of the drawings, which serve merely for explanation and should not be interpreted as being restrictive. In the drawings: 
         FIG.  1    shows a perspective view of a drain valve arrangement according to a first embodiment of the present invention; 
         FIG.  2    shows a further perspective view of the drain arrangement according to  FIG.  1   ; 
         FIG.  3    shows a side view of the drain arrangement according to  FIG.  1    in the closed position; 
         FIG.  4    shows a side view of the drain arrangement according to  FIG.  1    in the open position; 
         FIG.  5    shows a front view of the drain arrangement according to  FIG.  1   ; 
         FIG.  6    shows a side view of the drain arrangement according to  FIG.  1    in the closed position; 
         FIG.  7    shows a side view of the drain arrangement according to  FIG.  1    in the open position; 
         FIG.  8    shows a side view of the first embodiment with another actuating element; 
         FIG.  9    shows a perspective view of a drain valve arrangement according to a second embodiment of the present invention; 
         FIG.  10    shows a side view of the drain arrangement according to  FIG.  9    in the closed position; 
         FIG.  11    shows a side view of the drain arrangement according to  FIG.  9    in the open position; 
         FIG.  12    shows a front view of the drain arrangement according to  FIG.  9   ; 
         FIG.  13    shows a side view of the drain arrangement according to  FIG.  9    in the closed position; 
         FIG.  14    shows a side view of the drain arrangement according to  FIG.  9    in the open position; and 
         FIG.  15    shows a side view of the second embodiment with another actuating element. 
     
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
       FIGS.  1  to  8    show various views of a first embodiment of a drain arrangement according to the invention.  FIGS.  1  to  7    show a first variant of the first embodiment, and  FIG.  8    shows a second variant of the first embodiment. 
       FIGS.  9  to  15    show a second embodiment of a drain valve arrangement according to the invention.  FIGS.  9  to  14    show a first variant of the second embodiment, and  FIG.  15    shows a second variant of the second embodiment. In all the figures, identical parts are denoted by the same reference signs. 
     The drain valve arrangement  1  according to both embodiments serves for connection to a sanitary item  2 . The sanitary item  2  is preferably a washbasin or a sink. The drain arrangement  1  comprises a drain valve housing  3  having a first channel section  4  with an inlet opening  5 , having a second channel section  6  with an outlet opening  7 , and having a valve seat  8  situated between the inlet opening  5  and the outlet opening  7 . The drain valve arrangement  1  furthermore comprises a valve body  9  which is movable from the valve seat  8  from a closed position into an open position and back. The valve body  9  is moved from the closed position into the open position by way of an actuating unit  10 . The drain valve arrangement  1  furthermore comprises an outflow pipe  11  into which the second channel section  6  opens by way of the outlet opening  7  thereof. Via the outflow pipe  11 , water can be conducted away from the second channel section  6 . 
     A first central axis M 4  extends centrally through the first channel section  4 . In the installation position, the first central axis M 4  is substantially vertical, that is to say in the plumb line direction. An outflow pipe central axis M 11  extends centrally through the outflow pipe  11 . In the installation position, the outflow pipe central axis M 11  is substantially horizontal or is downwardly inclined at an angle in relation to the horizontal so that water can be conveyed away from the drain valve housing  3  through the outflow pipe. The second channel section  6  has a second central axis M 6 . 
     In the embodiments shown, the outflow pipe central axis M 11  intersects the first central axis M 4 . That is to say, the central axis M 11  and the central axis M 4  lie in a common plane, which may be referred to as central plane ME. The outflow pipe central axis M 11  may however also be at a distance from the first central axis M 4 , wherein said distance corresponds at most to half the diameter of the outlet opening  7 . 
     Furthermore, the actuating unit  10  has an actuating lever  12 , which acts on the valve body  9 , and an actuator element  13  for actuating the actuating lever  12 . In the embodiment shown, the actuating lever  12  projects into the interior of the drain valve housing  3  through a side wall  19  from outside the drain valve housing  3 . The actuator element  13  is arranged outside the outflow pipe  11  and, at least over a section, extends laterally alongside the outflow pipe  11 . The actuator element is in the form of an actuating rod in the variants in  FIGS.  1  to  7  and  9  to  14    and in the form of a cable pull in the variants in  FIGS.  8  and  15   . 
     The expression “laterally alongside the outflow pipe  11 ” is to be understood as meaning that, in the installation position, the actuator element  13  is, over said section, situated alongside the outflow pipe  11  and not below or above the pipe. Said position is specified in even greater detail further below on the basis of a structural space. 
     This arrangement has, as shown in the figures, the advantage that a compact drain arrangement  1  can be provided. This applies in particular with the condition of an advantageous pipeline in relation to flow losses. In the embodiment shown, the drain arrangement  1  has only a single diversion, specifically in the transition from the first channel section  4  to the second channel section  6 . Subsequently, the outflow pipe  11 , which is of rectilinear form here, extends directly from the second channel section  6 . This has the advantage that the flow losses during the outflow of the water are low. Furthermore, the arrangement of the actuator element  13  alongside the outflow pipe yields the advantage that the drain valve arrangement is formed with a small structural height in the downward direction. 
     In said section extending laterally with respect to the outflow pipe  11 , the actuator element  13  extends at a distance A laterally with respect to the outflow pipe  11 . The distance A is selected to be as small as possible. In particular, the distance A is less than the outer diameter D or less than half the outer diameter D of the outflow pipe  11 . 
     In all the embodiments, the actuator element  13  is mounted in a bearing point  14  situated on the outside of the drain valve housing. The bearing point  14  is likewise situated laterally with respect to the drain valve housing  3 . Here, the bearing point  14  has a bearing opening  15  for the passing-through of the actuator element  13 . If the actuator element  13  is an actuating rod, then the bearing point  14  is formed with the bearing opening  15  in such a way that pivoting of the rod around a pivot axle S is possible. If the actuator element is a cable pull, the bearing opening serves for the passing-through of the cable. In a preferred embodiment of the drain valve arrangement, it is possible, as shown in the figures, for two bearing openings to be arranged such that either the actuating rod or the cable pull can be led through the bearing opening. 
     In the installation position, the bearing point  14  or the bearing opening  15  is situated at a height which is substantially central with respect to the outflow pipe  11 . That is to say, in the installation position, the bearing point  14  or the bearing opening  15  is situated substantially at the height of the central axis M 6  of the second channel section. 
     The structural space B in which the actuator element  13  and those parts of the actuating lever which are situated outside the drain valve housing  3  are situated will now be explained in more detail on the basis of  FIGS.  5  and  12   . 
     The structural space B is bounded laterally by a vertical plane VE. The vertical plane VE, in the installation position, extends vertically and extends parallel to the outflow pipe central axis M 11  and to the first central axis M 4  and to the second central axis M 6 . The vertical plane VE is at a distance A from the outer side of the outflow pipe  11 . The distance A is selected to be as small as possible and corresponds preferably at most to the outer diameter D of the outflow pipe  11 , in particular at most to half the outer diameter D of the outflow pipe  11 . 
     The structural space B is bounded downwardly by a lower plane UE. The lower plane UE extends at right angles to the vertical plane VE. The lower plane UE furthermore extends through a lower lateral surface line UM. The lower lateral surface line UM is the line of intersection of a central plane ME extending through the outflow pipe central axis M 11  and vertically. The central plane ME extends parallel to the vertical plane VE. 
     In the variant in which the outflow pipe central axis M 11  intersects the first central axis M 4 , the central plane ME also extends through the first central axis M 4  and through the second central axis M 6 . In other words, the central plane ME is spanned by the outflow pipe central axis M 11 , the first central axis M 4  and the second central axis M 6 . In the variant in which the outflow pipe central axis M 11  is at a distance from the first central axis M 4 , the central plane extends spaced apart from and parallel to the first central axis M 4 . 
     The structural space B is bounded upwardly by an upper plane OE. The upper plane OE extends at right angles to the vertical plane VE. The upper plane OE furthermore extends through an upper lateral surface line OM. The upper lateral surface line OM is the line of intersection of the central plane ME defined above. 
     As shown in  FIGS.  5  and  12   , the structural space B extends laterally alongside the outflow pipe  11 , wherein the structural space B spatially closely adjoins the outflow pipe  11 . 
     Those elements of the actuating unit  10  which are situated outside the drain valve housing  3  are, as described, situated in the structural space B. The upper plane OE is passed through by the actuator element  13  according to the form of the actuator element  13 . In the embodiment of the actuator element  13  in the form of an actuating rod, the actuating rod, as shown in  FIGS.  1  to  7  and  9  to  14   , extends in said structural space B or below the upper plane OE substantially over the whole length of the outflow pipe  11 . The actuator element  13  passes through the structural space B in the end region of the outflow pipe  11  opposite the drain valve housing  3 . In the embodiment of the actuator element  13  in the form of a cable pull, the cable pull can pass through the upper plane OE at a less distant point. In both variants, however, the actuator element  13  is situated in such a way that the lower plane UE and the vertical plane VE are not passed through. 
     It can be clearly seen from the sectional illustrations in  FIGS.  6  and  7    and also  13  and  14  that the actuating lever  12  has a lever arm  22  which acts on the valve body  9 . The actuating lever  12  is pivoted around the lever axle  17  by the actuator element  13  and in the process lifts the valve body  9  from the closed position, as shown in  FIGS.  6  and  13   , into the open position, as shown in  FIGS.  7  and  14   . 
     The lever axle  17  is mounted in a bearing point  18  in a side wall  19  of the outflow housing  3 , wherein the lever axle  17  projects out of the outflow housing  3 , and wherein the lever axle  17  has, in particular at an end side, a lever projection  20  with an articulation point  21  on which the actuator element  13  acts. The lever projection  20  and the articulation point  21  are likewise situated in said structural space B. 
     The embodiment as per  FIGS.  1  to  8    has, in the first channel section, lateral overflow openings  32  via which overflow water can flow away. 
     In the embodiments as per  FIGS.  9  to  15   , the drain arrangement  1  furthermore has an overflow unit  23 . 
     By way of the overflow unit  23 , an emergency overflow can be provided if the valve body  9  is in the closed position. The overflow unit  23  has a first connecting pipe  24 , an overflow pipe  25  and a second connecting pipe  26 . The first connecting pipe  24  is led, from an upper mouth opening  27 , out of the first channel section  4  from above the valve seat  8 . The mouth opening  27  forms an aperture through the side wall  19  of the drain valve housing  3 . The first connecting pipe  24  opens into the overflow pipe  25 , which, in the installation position, extends upwards substantially counter to the plumb-line direction. An overflow edge is arranged in the interior of the overflow pipe  25 . The overflow pipe  25  then opens, below the first connecting pipe  24 , into the second connecting pipe  26 . The second connecting pipe  26  opens, below the valve seat  8 , into the first channel section  4  via a lower mouth opening  28 . The lower mouth opening  28  likewise forms an aperture through the side wall  19 . 
     The mouth openings  27 ,  28  open into the outflow valve housing  3  laterally with respect to the outflow valve housing  3 . Despite this, the outflow pipe  11  opens into the outflow valve housing  3  laterally with respect to the outflow valve housing  3 . This opening in a lateral manner yields the advantage that the drain arrangement can be formed highly compactly in the downward direction. 
     In the embodiment shown, the mouth openings  27 ,  28  are provided by in each case one mouth channel section  29 ,  30 . The mouth channel sections  29 ,  30  extend, as can be clearly seen in  FIG.  9   , laterally away from the outflow valve housing  3 . The mouth channel sections  29 ,  30  are inclined at an angle to the outflow pipe central axis M 11 . In the embodiment shown, the angle is a right angle. Other angles in the range from 45° to 135° are likewise conceivable. 
     The mouth openings  27 ,  28  are delimited at a face side by side edges  37 . The side edges  37  lie in a plane which is parallel or at an angle of at most 45° to a central plane ME extending through the first central axis M 4  and the pipe central axis M 11 . 
     As can be seen in  FIGS.  9  to  15   , the two connecting pipes  24 ,  26  extend laterally alongside the outflow pipe  11 , wherein, as seen in the installation position from above, the connecting pipe central axes M 24 , M 26  are parallel to the outflow pipe central axis M 11 .  FIGS.  10  and  11    show the orientation of the two connecting pipes  24 ,  26 . In the installation position, the connecting pipe central axes M 24 , M 26  are inclined at an angle with respect to a horizontal plane HE, wherein the connecting pipes  24 ,  26  descend towards the mouth openings  27 ,  28 . In other words, the connecting pipe central axes M 24 , M 26  are inclined at an angle to the outflow pipe central axis M 11 . 
     Furthermore, a diversion section  33  is provided between the mouth openings  27 ,  28  and the respective connecting pipe  24 ,  26 . In the embodiment shown, the diversion section  33  is part of the connecting pipe  24 ,  26 . 
     The connecting pipes  24 ,  26  each project with a pipe section  31  into the mouth openings  27 ,  28 . In each case one seal is arranged between the pipe sections  31  and the mouth openings  27 ,  28 . 
     The overflow pipe  25  projects, in each case with a pipe section, into the connecting pipes  24 ,  26 . In each case one seal is arranged between the pipe sections and the connecting pipes  24 ,  26 . 
     The first connecting pipe  24  and the second connecting pipe  26  are preferably formed as an integral structure. 
     The overflow unit  23  extends on the side opposite the actuator element  13 , that is to say on the other side of the outflow pipe. 
     The lateral arrangement of the overflow unit  23  and the actuator element  13 , in each case alongside the outflow pipe, has, as is shown in the figures, the advantage that a compact drain arrangement  1  can be provided. This applies in particular with the condition of an advantageous pipeline in relation to flow losses. In the embodiment shown, the drain arrangement  1  has only a single diversion, specifically in the transition from the first channel section  4  to the second channel section  6 . Subsequently, the outflow pipe  11 , which is of rectilinear form here, extends directly from the second channel section  6 . This has the advantage that the flow losses during the outflow of the water are low. Furthermore, the arrangement of the overflow unit  23  and of the actuator element  13  alongside the outflow pipe yields the advantage that the drain valve arrangement is formed with a small structural height in the downward direction. 
     The structural space C in which the overflow unit  23  is situated extends laterally alongside the outflow pipe  11  in the upward direction. In the installation position, the structural space C is bounded downwardly by a lower plane UE. The lower plane UE extends at right angles to a central plane ME, which is spanned by the first central axis M 4  and the second central axis M 6  or the pipe central axis M 11 , and extends through a lower lateral surface line UM, which forms the line of intersection of a vertical plane VE, extending through the outflow pipe central axis M 11  and vertically, with the pipe outer side. 
     
       
         
           
               
             
               
                   
               
               
                 LIST OF REFERENCE SIGNS 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                 1 
                 Drain valve arrangement 
               
               
                 2 
                 Sanitary item 
               
               
                 3 
                 Drain valve housing 
               
               
                 4 
                 First channel section 
               
               
                 5 
                 Inlet opening 
               
               
                 6 
                 Second channel section 
               
               
                 7 
                 Outlet opening 
               
               
                 8 
                 Valve seat 
               
               
                 9 
                 Valve body 
               
               
                 10 
                 Actuating unit 
               
               
                 11 
                 Outflow pipe 
               
               
                 12 
                 Actuating lever 
               
               
                 13 
                 Actuator element 
               
               
                 14 
                 Bearing point 
               
               
                 15 
                 Bearing opening 
               
               
                 16 
                 Lateral surface 
               
               
                 17 
                 Lever axle 
               
               
                 18 
                 Bearing point 
               
               
                 19 
                 Side wall 
               
               
                 20 
                 Lever projection 
               
               
                 21 
                 Articulation point 
               
               
                 22 
                 Lever arm 
               
               
                 23 
                 Overflow unit 
               
               
                 24 
                 First connecting pipe 
               
               
                 25 
                 Overflow pipe 
               
               
                 26 
                 Second connecting pipe 
               
               
                 27 
                 Upper mouth point 
               
               
                 28 
                 Lower mouth point 
               
               
                 29 
                 Mouth channel section 
               
               
                 30 
                 Mouth channel section 
               
               
                 31 
                 Pipe section 
               
               
                 32 
                 Lateral overflow openings 
               
               
                 33 
                 Diversion section 
               
               
                 A 
                 Distance 
               
               
                 B 
                 Structural space 
               
               
                 M4 
                 Central axis, first channel 
               
               
                   
                 section 
               
               
                 M6 
                 Central axis, second channel 
               
               
                   
                 section 
               
               
                 M11 
                 Central axis, outflow pipe 
               
               
                 VE 
                 Vertical plane 
               
               
                 ME 
                 Central plane 
               
               
                 OE 
                 Upper plane 
               
               
                 UE 
                 Lower plane 
               
               
                 OM 
                 Upper lateral surface line 
               
               
                 UM 
                 Lower lateral surface line 
               
               
                 S 
                 Pivot axle