Abstract:
A sanitary outlet unit ( 1 ) is provided, including an outlet armature ( 2 ), with a flow regulator ( 4 ) in a region of the water outlet ( 3 ) thereof, wherein an aeration device is provided for aeration of the water flow. The outlet unit ( 1 ) provides that the aeration unit ( 5 ) is located in the outlet armature ( 2 ) and/or in at least one water line leading to the outlet armature ( 2 ) separately from the flow regulator ( 4 ). Through the spatial separation of the functions of flow shaping or water discharge and the aeration of the water flow, there are many possible embodiments for optionally providing the water outlet ( 3 ) of the sanitary outlet unit ( 1 ) with an extremely thin design.

Description:
BACKGROUND 
     The invention relates to a sanitary outlet unit with an outlet armature, having a water outlet, with an aeration device being provided for aerating the water flow. 
     Various flow regulators are known, which aerate a water flow exiting a sanitary outlet armature in order to form a homogenous, bubbling-soft water flow. For this purpose, the known flow regulators are provided in their flow regulator housing with a flow splitter, usually embodied as a perforated plate, with a homogenization unit and perhaps a flow straightener being arranged downstream. The flow regulator housing of the known flow regulators is provided with aerating openings in the area of the homogenization device, which serve as an aeration device for aerating the water flow, temporarily separated into individual jets via the flow splitter (cf. DE-A-30 00 799). The known flow regulator with their flow regulator housings are inserted into an outlet mouthpiece, which can be fastened at the fitting outlet via a screw connection. 
     The outlet mouthpiece necessary for fastening the known flow regulators determines the shape of the sanitary outlet armatures in the proximity of the fitting outlet. However, it is increasingly attempted to design unconventional and esthetically demanding sanitary outlet armatures. 
     SUMMARY 
     Therefore the object of the invention is to provide a sanitary outlet unit of the type mentioned at the outset which in the embodiment of its outlet armatures offers the greatest-possible design freedom with at least the same functionality. 
     The object is attained according to the invention in the sanitary outlet unit of the type mentioned at the outlet, in particular, in that the aeration device is provided in the flow direction at a distance upstream in reference to the water outlet inside the outlet armature and/or at least in one of the water pipes leading to the outlet armature. 
     In the outlet unit according to the invention the aeration device is arranged upstream in the flow direction at a distance from the water outlet. Here, a spatial separation is achieved between the water outlet of the outlet armature, on the one hand, and the aeration device, on the other hand. This way, for example, in the water outlet of the outlet armature a jet formation can occur, while the air inlet and, if applicable, the determination of the amount of flow is performed at a location arranged further upstream. By this spatial separation the water outlet itself can be designed extremely slender so that design freedom as great as possible in the design of such outlet units is achieved without any loss in functionality. 
     Here, a particularly beneficial embodiment according to the invention provides that the outlet armature has a flow regulator in the area of its water outlet, and that the aeration device is provided separated from the flow regulator in the outlet armature and/or at least in one of the water lines leading to the outlet armature. In this preferred embodiment, a spatial separation occurs between the aeration of the water flow, on the one hand, and the jet formation provided in the flow regulator, on the other hand. The jet formation occurs at the water outlet of the outlet armature, while the air inlet is provided at a distance in the flow direction upstream in reference to the water outlet. 
     Due to the fact that the water outlets of the prior art outlet armatures are frequently arranged at the highest point of an outlet armature it must be ensured that when the outlet armature is closed the water still remaining in the outlet armature does not exit through the aeration device arranged lower than the water outlet. It is therefore beneficial when the aeration device has at least one one-way aeration valve or a reflux prevention device. 
     Here, a preferred embodiment according to the invention provides for the aeration device to include at least one duck-bill or membrane valve and/or at least one umbrella valve. 
     In order to optionally get an aerated or non-aerated water jet from the outlet unit according to the invention it is beneficial to allow the aeration device to be opened or closed. 
     Here, a particularly simple embodiment of the invention, associated with only small production expense, provides that the aeration opening of the aeration device has a closing lid upstream the aeration device, which releases the aeration opening in an opened position and closes the aeration opening in a closed position in a sealing manner. 
     In order to allow the water jet flowing through the aeration device to suction and entrain air and mixing therewith it is beneficial when immediately upstream of the mouth forming the mixing zone of air and water inlet, an acceleration path is interposed in the water inlet for accelerating the water to be mixed with air. 
     Here, a preferred embodiment according to the invention provides for the acceleration path to be provided as a construction in the cross-section of the water pipe upstream in reference to the aeration device. 
     A better mixing of the water jet with air is achieved when a water guide is provided downstream in reference to the aeration device, guiding the aerated water jet at the interior perimeter of the water pipe or the outlet armature. In this particularly advantageous embodiment, the water jet exiting the aeration device is intentionally directed to the walls of the fitting housing, in order to be reflected there and thus better interlaced. 
     Here, a particularly simple embodiment according to the invention, associated with little production expense, provides that the water guidance is embodied as a V-shaped or funnel shaped guidance grid, tapering in the flow direction, with its guide walls surrounding the grid openings being embodied as water guidance walls. 
     The grid openings of the guide grid have a large cross-section for the flow and yet through the guide walls surrounding the grid openings provide good guidance of the water jet when the grid openings of the guidance grid are essentially embodied honeycomb-shaped. 
     It is beneficial for the aeration device to be embodied as inserted cartridges or integrated cartridges, which can be inserted into pipe or fitting sections leading to the water outlet. 
     A particularly preferred embodiment according to the invention provides for the cartridge housing of the aeration device to be provided upstream with at least one penetration opening and that at least one penetration opening is embodied as an acceleration path. 
     Here, it is advantageous when the water guide is provided in the area of the housing outlet of the casing housing. 
     The aeration device can be inserted particularly well into the fitting housing if the valve outlet of at least one aeration valve is provided in the area between the acceleration path and the housing outlet of the casing housing. 
     Here, a preferred embodiment according to the invention provides that the fitting housing is provided at a distance upstream in reference to the water outlet with an insertion opening leading to the clear cross-section of the fitting, in which the aeration device can be preferably inserted in a detachable manner. 
     An aeration device embodied as an inserted casing or an integrated cartridge can be immediately inserted into a cast housing, particularly embodied as a cast body, when the receptacle for this inserted casing or integrated cartridge is produced in a respective cutting manner in the fitting housing. An advantageous embodiment according to the invention provides therefore that the insert opening opens into a preferably sheath-shaped cartridge or casing receptacle, which is used for receiving the aeration device embodied as inserted casing or integrated cartridge. This sheath-shaped cartridge or casing receptacle can for example be produced from a thin-walled sheet metal construction, which is mounted in the fitting housing of the outlet armature. 
     It is possible to provide the aeration device immediately in the fitting housing of the outlet armature. Additionally or instead thereof the aeration device may also be arranged in a pipe adapter, which can be interposed in at least one water line leading to an outlet armature. 
     The aeration device can also be mounted, hardly visible, outside the sink when the aeration device is arranged in a pipe adapter, which can be interposed in at least one of the water lines leading to an outlet armature. 
     Here, it is a particular advantage of an aeration device arranged in a line adapter that the aeration device can be interposed in the warm water or the cold water line. When the aeration device is interposed in the warm water or the cold water line, based on the jet image it is easily discernible if the water flowing out of the outlet armature represents warm and/or cold water. When for example an air-water mixture is provided in the warm water line, while the cold water inlet is not provided with an aeration device, this means that a crystal clear water jet represents cold water, while a strongly aerated water jet indicates hot water and a slightly aerated water jet mixed water. The user can therefore recognize the approximate temperature condition of the water flowing out of the outlet armature, based on the level of air mixed in, for example the opacity and white coloration by the water bubbles. 
     In order to create an aerated and accordingly bubbling-soft water jet it may be beneficial to embody the outlet armature as a shower device. 
     Another preferred exemplary embodiment provides that the outlet armature is embodied as a hand-held or kitchen sprayer. Normally, such kitchen sprayers provide the option to switch the water jet from spray jet to normal jet. By integrating an aeration device, which may perhaps can be closed, for example in the sprayer handle of such a hand-held or kitchen sprayer, it is possible for the user to design the spray jet or the normal jet optionally with or without any air mixed therein so that the possibility of jet variations can be doubled in such an aeration device, which offers the user an additional benefit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the following, the invention with its essential features is explained in greater detail using the drawings. Shown are: 
         FIG. 1  a perspective view of a sanitary outlet unit having at its water outlet a flow regulator and upstream, in the fitting housing, an aeration device for aerating the water flowing through the outlet armature, 
         FIG. 2  a view of the outlet unit of  FIG. 1  in the area of the water outlet of its outlet armature, 
         FIG. 3  a view of the outlet unit of  FIGS. 1 and 2  in the area of the aeration device located in the fitting housing of the outlet armature, 
         FIG. 4  a perspective view of the aeration device of the outlet unit according to  FIGS. 1 through 3 , embodied as an inserted casing or an integrated cartridge, 
         FIG. 5  a view of a water guide provided downstream at the aeration device and embodied as a guidance grid, 
         FIG. 6  an exploded view showing individual parts of the aeration device of the outlet unit from  FIGS. 1 through 5 , 
         FIG. 7  a perspective side view of the aeration device of the outlet unit shown in  FIGS. 1 through 6 , 
         FIG. 8  a view of a comparable aeration device not provided with any water guide downstream, 
         FIG. 9  a perspective side view of the aeration device of  FIG. 7 , 
         FIG. 10  a longitudinal cross-sectional view of an aeration device mounted in a fitting unit housing, with the aeration device having a one-way aeration valve embodied as an umbrella valve, 
         FIG. 11  an exploded view showing individual parts of the aeration device of  FIG. 10 , 
         FIG. 12  a perspective side view of the aeration device of  FIGS. 10 and 11 , 
         FIG. 13  a view of a sanitary outlet unit, comparable to  FIG. 1 , with its aeration device being able to be opened or closed via a closing lid, 
         FIG. 14  a view of an outlet unit of  FIG. 13  in a lateral cross-section in the area of the water outlet, 
         FIG. 15  a longitudinal cross-sectional view of an outlet unit of  FIGS. 13 and 14  in the area of the aeration device, 
         FIG. 16  a perspective side view of the aeration device allocated to the outlet unit according to  FIGS. 13 through 15 , 
         FIG. 17  an exploded view showing individual parts of the aeration device of  FIG. 16 , 
         FIG. 18  a longitudinal cross-sectional view of an aeration device which without any receptacle sheath, can directly be inserted into a receptacle of the outlet armature cast body, produced in a cutting manner, 
         FIG. 19  an exploded view of an aeration device of  FIG. 18 , 
         FIG. 20  a view of an outlet unit embodied as a shower, with an aeration device located in a pipe adaptor being integrated upstream thereof. 
         FIG. 21  a longitudinal cross-sectional view of the pipe adapter of the outlet unit shown in  FIG. 20 , 
         FIG. 22  an exploded view showing individual parts of the aeration device allocated to the outlet unit according to  FIGS. 20 and 21 , 
         FIG. 23  a view of a sanitary outlet unit with in its cold and warm water feeding lines each including an aeration device located in a pipe adapter being interposed, and the aeration devices can be opened and closed, 
         FIG. 24  a longitudinal cross-sectional view of one of the aeration devices allocated to the outlet unit according to  FIG. 23  taken through the pipe adapter, 
         FIG. 25  an exploded view shoeing individual parts of one of the aerations unit allocated to the outlet unit according to  FIGS. 23 and 24 , 
         FIG. 26  a perspective view of an outlet unit, embodied as a hand or kitchen sprayer, 
         FIG. 27  a perspective view of the outlet unit of  FIG. 26  taken from a different angle of view, 
         FIG. 28  a longitudinal cross-sectional view of the outlet unit of  FIGS. 26 and 27  in the area of the aeration device integrated in the handle of the shower, 
         FIG. 29  an exploded view showing individual parts of the aeration device allocated to outlet unit according to  FIGS. 26 through 28 , 
         FIG. 30  a partial cross-sectional view of an aeration device embodied as an inserted casing or integrated cartridge provided with an umbrella valve, 
         FIG. 31  a side view of the aeration device of  FIG. 30 , 
         FIG. 32  a longitudinal cross-sectional view of the aeration device of  FIGS. 30 and 31 , 
         FIG. 33  a bottom perspective view of the aeration device of  FIGS. 30 through 32 , 
         FIG. 34  an exploded view showing individual parts of the aeration device of  FIGS. 30 through 33 , 
         FIG. 35  a side view of the umbrella or shield valve of the aeration device shown in  FIGS. 30 through 34 , 
         FIG. 36  a longitudinal cross-sectional view of the umbrella valve of  FIG. 35 , 
         FIG. 37  a perspective view of the umbrella valve of  FIGS. 35 and 36 , 
         FIGS. 38-39  the valve body carrying the valve seat of the umbrella valve shown in  FIGS. 36 and 37  in a side view ( FIG. 38 ) and in a perspective representation ( FIG. 39 ), 
         FIGS. 40-41  a gasket arranged at the exterior perimeter of the valve body in a side view ( FIG. 40 ) and in a perspective representation ( FIG. 41 ), and 
         FIGS. 42-43  the valve umbrella of the umbrella valve shown in  FIGS. 36 through 41  in a side view ( FIG. 42 ) as well as in a perspective top view ( FIG. 43 ). 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In  FIGS. 1 through 7 , a sanitary outlet unit  1  is shown in various views. The outlet unit  1  is provided with an outlet armature  2 , which in the area of its water outlet  3  has a flow regulator  4  shown in  FIG. 2 , which shall homogenously form the exiting water jet. In order to allow the water jet to be aerated and to create a pearly-soft water jet an aeration device  5  is provided. 
     In a comparison of  FIGS. 1 through 3  it is discernible that the aeration device  5  is provided separate from the flow regulator  4  in the outlet armature  2 . For this purpose, in the armature housing of the outlet armature  2 , an insert opening  6  is provided upstream, at a distance from the water outlet  3  and the flow regulator  4  located there, laterally at the fitting housing, leading to the open cross-section of the fitting. This insert opening  6  leads to a sheath-shaped casing or cartridge receptacle  7 , arranged in the armature housing, which is embodied as a thin-walled sheet metal construction and open both towards upstream as well as downstream. 
     The aeration device  5 , embodied as an insertion casing or integrated cartridge, can be inserted in a detachable manner into the sheath-shaped cartridge or casing receptacle  7  via the insert opening  6  and is here held by a snap ring  8 , which can be inserted into a groove  9  at the side of the opening in the cartridge receptacle  7 . 
     In the outlet unit  1  shown here, the jet formation caused by the flow regulator  4  remain at the water outlet  3  of the sanitary fitting  2 , while the air inlet and the determination of the flow amount is moved to a point further upstream. Due to the fact that the water outlet  3  occurs at the highest point of the outlet armature  2  the aeration device  5  has a one-way aeration valve  10 , which here is embodied as a duck-bill or membrane valve which prevents an exiting of water remaining in the outlet armature  2  through an aeration opening arranged below the water outlet  3 . The one-way aeration valve  10  is covered from sight by a front-mounted grid  40 , which also serves as a vision block. 
     In  FIGS. 3 and 6  it is discernible that the casing housing of the aeration device  5  has several penetrating openings  11  upstream embodied as cross-sectional constrictions, which form an acceleration path  12  for accelerating the water flow to be mixed with air. Downstream from the aeration device  5  there is a water guide  13 , leading the aerated water flow to the interior perimeter of the water pipe and particularly the outlet unit  2 , with the guide being embodied as a V-shaped or funnel shaped guiding grid  14  tapering in the direction of flow, with its guide walls which surround the grid openings being embodied as water guide walls. In order to maintain a flow cross-section as large as possible, and simultaneously to allow as good as possible the water flow to be guided along the guide walls surrounding the grid openings, the grid openings of the guiding grid  14  are embodied essentially in the form of honey-combs. The guidance grid  14  serving as a water guide is provided in the area of the housing outlet of the casing housing and held downstream in the cartridge receptacle  7 . 
     The valve outlet of the aeration valve  10  is arranged in the area between the acceleration path  2  and the housing outlet of the casing housing. The valve outlet of the aeration valve  10  opens into a mixing zone, which is arranged in the mouth of the air and water inlet. The water flow accelerated in the acceleration path  12  can suction, sufficiently mix, and entrain the air entering the mixing zone through the aeration valve  10 . 
     The spatial separation of the function water outlet and water forming, on the one hand, and the air intake in the aeration device  5 , on the other hand, allows the design of the water outlet  3  of the outlet armature  2  in an extremely slender manner. 
       FIGS. 8 and 9  show an aeration device  5 , for which an outlet unit is determined similar to  FIGS. 1 through 7 . The V-shaped guiding grid  14  provided, which serves to improve interlacing of the flow, is not included, here to simplify the illustration. The aeration device  5  shown in  FIGS. 8 and 9  has a protective basket or jacket  15  open towards downstream, which surrounds the aeration valve  10  in its section protruding into the mixing zone. The protective basket  15  prevents fast, bundled water jets exiting the acceleration lane  12  with high speed from directly impinging the aeration valve  10  and which can lead to malfunctions. 
     In  FIGS. 10 through 12 , an aeration device  5  similar to  FIGS. 8 and 9  is shown, with its aeration valve  10  here being embodied as an umbrella valve. Compared to the membrane valve shown in  FIGS. 1 through 8 , the umbrella valve  10  in  FIGS. 8 and 9  is comparatively flat and has a considerably lower structural height. 
     In  FIGS. 13 through 17 , a sanitary outlet unit  1  with an aeration device  5  is shown, which can be opened and closed. For this purpose, a closing lid  16  is mounted upstream of the aeration opening of this aeration device  5 , which releases the aeration opening in an open position and closes in a closed position the aeration opening in a sealing fashion. 
     By rotating the closing lid  16  the air intake can be closed so that the user is free to choose if he/she wants a water output in an aerated form or in an non-aerated form. By rotating the closing lid  16 , the O-ring  17  located in the closing lid  16  is loosened from its position, so that an air intake is possible into the water flow through the aeration valve  10 . When the closing lid  16  is rotated, which for example is connected via a thread to the casing or cartridge housing of the aeration device  5 , until the O-ring  17  of the closing lid  16  at the face that contacts the aeration valve  10  or the aerating device  5 , the air intake via the aeration valve  10  is interrupted, so that the water flowing through the sanitary outlet unit  1  is no longer aerated. 
     In  FIGS. 18 and 19  an aeration device  5  is shown, which can be inserted directly into the cast body of the outlet armature through an insertion opening  6 . Contrary to the aeration devices  5  shown in  FIGS. 1 through 17  the aeration device according to  FIGS. 18 and 19  can omit a sheath-shaped cartridge or casing receptacle, because the receptacle for the aeration device  5  according to  FIGS. 18 and 19  is integrated through cutting directly into the outlet unit  2  at the cast body. 
     In  FIGS. 20 through 22 , a sanitary outlet unit  1  is formed, which is embodied as a shower. In the hose  18  leading to the shower head  30  an aeration device  5  is interposed, which is arranged in a pipe adapter  19 . As discernible from a comparison of the  FIGS. 20 and 21 , the pipe adapter  19 , having a cross-section in the form of a sheath or pipe-section, has at its end section an interior thread, which can be screwed onto a screw neck stub provided at the fitting outlet  20  of the outlet unit  1 . At the opposite end region of the pipe adapter  19  an exterior thread is provided, onto which the hose  18  leading to the shower head  30  can be screwed. The aeration device  5 , that can be inserted through a lateral insertion opening  6  into the pipe adapter  19  and here also be secured by a snap ring  8 , can be opened and closed via the closing lid  16 . The pipe adapter  19  can also be connected in a retrofitting manner to any commercially available hose  18 . The pipe adapter  19  with the aeration device  5  located therein allows the user to create an aerated or a non-aerated shower jet. The aeration is affected in a similar fashion as in  FIGS. 13 through 17 , by blocking the air intake via rotating the sealing closing lid  16 . 
     In  FIGS. 23 through 25 , a connected unit  1  with an outlet armature  2  is shown, with an aeration device  5  located in a pipe adapter  19  being interposed in its warm water and its cold water inlet. Using the pipe adapter  19 , which can be retrofitted, as well as the aeration devices  5  located therein makes it possible to discharge optionally an aerated or a non-aerated water jet at the outlet armature. The particular advantage of the outlet unit  1  shown in  FIGS. 23 through 25  is the fact that optionally only one of the two feeding pipes is provided with air. By the closing lid  16  provided at the aeration device  5  air, can be mixed optionally only with the warm water or the cold water inlet. This allows recognition by the flow image if it is cold and/or warm water; when the closing lid  16  of the aeration device  5  interposed in the warm water inlet is open and the closing lid  16  of the aeration device  5  allocated to the cold water inlet is closed, a non-aerated and correspondingly crystal clear water jet shows that cold water is flowing, while a strongly aerated water jet indicates hot water, and slightly aerated outflow of water indicates mixed water. The user can therefore determine the approximate temperature state of the water jet using the degree of water/air mixture, namely using the opacity and white coloration of the outflow water due to visible water bubbles. 
     In  FIGS. 26 through 29  an outlet unit  1  is shown, which is here embodied as a hand or kitchen sprayer. In the outlet unit  1  according to  FIGS. 26 through 29  embodied as a hand or kitchen sprayer the aeration device  5  is directly integrated in the shower handle. The shower handle of the hand or kitchen sprayer is therefore provided with an insert opening  6 , embodied hollow and in the form of a water pipe leading to the interior of the shower handle, into which the aeration device  5  can be inserted from the outside. Normally such hand or kitchen sprayer has the possibility to be switched from spray jet to normal jet and vice versa. By the integration of an aeration device shown here, which for example can be opened or closed via a closing lid  16 , it is also possible to design the spray or the normal jet optionally with or without an addition of air, so that the possibility of the jet variation can be doubled by the here provided aeration device  5 , which provides the user with an additional use. 
     In  FIGS. 30 to 34 , another embodiment of an aeration device  5  is shown, which differs for example from the aeration device shown in  FIGS. 3 and 8 , among other things, due to an aeration valve embodied as an umbrella valve  10 . The aeration device  5  according to  FIGS. 30 through 34  is embodied as an inserted casing or integrated cartridge, which in a similar manner to the aeration devices shown above, can be inserted into an upstream arranged sheath-shaped casing or cartridge receptacle, at a distance form the water outlet. 
     The aeration device  5  of  FIGS. 30 through 34 , shown as a casing housing, is provided in the upstream direction with several penetrating openings  11 , embodied as cross-sectional constrictions, which form an acceleration path  12  for accelerating the water flow to be mixed with air. Here the aeration device  5  is also provided downstream with a water guidance  13 , leading the aerated water flow to the interior perimeter of the water pipe and especially the outlet unit, which is embodied as a guidance grid  14  tapering in the flow direction V-shaped or funnel shaped, with its guide walls, surrounding the grid openings, being embodied as water guide walls. The grid openings of this guidance grid  14  are also essentially embodied honeycomb shaped in order to allow the maintenance of a flow cross-section that is as large as possible at the guidance walls surrounding the grid openings. The guidance grid  14  serving as a water guide is provided in the area of the housing outlet of the casing housing and is at the downstream of the cartridge receptacle. 
     The valve outlet of the aeration valve  10  is arranged in the area between the acceleration path  12  and the housing outlet of the cartridge housing. The valve outlet of the aeration valve opens in a mixing zone, which is arranged in the mouth of the air and water inlet. The water flow accelerated through the acceleration path  12  allows the air entering through the aeration valve  10  to be suctioned, well mixed, and entrained. 
     The aeration valve  10  of the aeration device  5  shown in  FIGS. 30 through 34  is shown in greater detail in  FIGS. 34 through 43 . As discernible from  FIG. 36 , the valve umbrella  50  of the aeration valve  10  embodied as an umbrella valve impinges the valve seat  51  with an obtuse angled corner section  62  of the edge of its umbrella perimeter linearly encircling and at a gradual pre-stress via the umbrella perimeter. This pre-stress of the valve umbrella  50 , gradually impinging the valve seat  51 , is achieved in that the support surface forming the valve seat has different elevations and that the valve seat  51  is allocated in a plane which is arranged at an angle in reference to the plane determined by the edge region of the umbrella perimeter of the unstressed valve umbrella  50 . By this linear impingement of the valve seat  51 , on the one hand, and/or the gradual pre-stressing of the valve umbrella  50  resting on the valve seat  51 , on the other hand, air can be suctioned through the aeration valve  10 , without the valve umbrella  50  oscillating and creating undesired trumpet-type noises. 
     The section  57  of the aeration device  5  guiding the water flow is separated from the one-way aeration valve  10  by a labyrinth  53 , which is formed by several, here three, labyrinth walls  54 ,  55 ,  56  arranged off-set and at a distance in reference to each other, each of which covers a partial section of the open cross-section arranged between the aeration valve  10  and the section  57 . Thereabove, the labyrinth  53  is provided in a cylindrical sheath  58 , which extends with its open sheath end, facing away from the aeration valve  10 , into the section  57 . Using the labyrinth  53  and/or the cylindrical sheath  58  a reverse splashing of the water during the water suction phase is prevented, which otherwise would lead to a calcification at the valve umbrella  50  and could lead to disturbing water residue at the exterior surface of the sanitary outlet armature.