Sanitary outlet unit

1. A sanitary outlet unit, comprising:

a housing ( 3 ) having an inlet and an outlet;

a valve element ( 4 ) arranged in a flow path ( 2 ) in the housing ( 3 ) between the inlet and the outlet, the valve element is switchable between an open position and a closed position, the closed position being arranged below the open position in a use position of the sanitary outlet unit, and the valve element is configured to automatically fall to the closed position upon a pressure drop of water in the flow path;

the valve element ( 4 ) has a contact surface ( 6 ) which, in the open position, bears on a counterpart surface ( 7 ) of the housing ( 3 ) and, in the closed position, is spaced apart from the counterpart surface ( 7 ), such that the counterpart surface ( 7 ) in the closed position is adapted to be wettable by water in the flow path ( 2 );

an impact surface ( 8 ) formed on the valve element ( 4 ) and, in the open position, the impact surface is adapted to be acted upon by a pressure prevailing in the flow path ( 2 ), such that the contact surface ( 6 ) is pressed against the counterpart surface ( 7 ); and

an actuating element ( 13 ) that is accessible from outside the housing ( 3 ) and with which the valve element ( 4 ) is transferable from the closed position to the open position, and the flow path is limited to a greater extent in the closed position than in the open position to provide a positive flow rate to the outlet that is lower than a flow rate to the outlet in the open position for an automatic water saving function.

2. The sanitary outlet unit ( 1 ) as claimed in claim 1 , wherein the impact surface ( 8 ) is formed on a side of the valve element ( 4 ) directed away from the contact surface ( 6 ), and a displacement body ( 9 ) is formed on the valve element ( 4 ), said displacement body ( 9 ), in the open position, is arranged in a receiving space ( 10 ) closeable by the contact surface ( 6 ) and the counterpart surface ( 7 ) and, in the closed position, is arranged at least partially outside the receiving space ( 10 ).

3. The sanitary outlet unit ( 1 ) as claimed in claim 2 , wherein the displacement body ( 9 ) is guided in the receiving space ( 10 ).

4. The sanitary outlet unit ( 1 ) as claimed in claim 2 , further comprising at least one relief channel ( 12 ) that opens into the flow path ( 2 ) formed between the displacement body ( 9 ) and an inner wall ( 11 ) of the receiving space ( 10 ), and water displaced from the receiving space ( 10 ) is adapted to be removed via said relief channel ( 12 ).

5. The sanitary outlet unit ( 1 ) as claimed in claim 1 , wherein the actuating element ( 13 ) is rod-shaped.

6. The sanitary outlet unit ( 1 ) as claimed in claim 1 , wherein the actuating element ( 13 ) is formed separately from the valve element ( 4 ) and is movable independently thereof.

7. The sanitary outlet unit ( 1 ) as claimed in claim 6 , wherein the actuating element ( 13 ) is guided displaceably in the housing ( 3 ).

8. The sanitary outlet unit ( 1 ) as claimed in claim 1 , further comprising a flow obstacle formed by or at a valve seat ( 15 ) of the valve element ( 4 ), and in the open position in the flow path ( 2 ), the impact surface ( 8 ) is arranged upstream from the flow obstacle.

9. The sanitary outlet unit ( 1 ) as claimed in claim 8 , wherein the contact surface ( 6 ) is formed on an encircling rim ( 16 ) which, in the closed position, interacts with the valve seat ( 15 ) to provide an at least partial closure.

10. The sanitary outlet unit ( 1 ) as claimed in claim 1 , further comprising a flow rate regulator or flow rate limiter ( 18 ) arranged upstream from the valve element ( 4 ) in the flow path ( 2 ).

11. The sanitary outlet unit ( 1 ) as claimed in claim 1 , wherein the contact surface ( 6 ), in the closed position, is on the inflow side of the valve element ( 4 ).

12. The sanitary outlet unit ( 1 ) as claimed in claim 2 , wherein the displacement body ( 9 ) is made of a metallic material, and the actuating element ( 13 ) is made of plastic.

13. The sanitary outlet unit ( 1 ) as claimed in claim 1 , further comprising a flow baffle ( 19 ) arranged such that, in the closed position, the valve element ( 4 ) is at least partially screened off in a circumferential direction, and the flow baffle ( 19 ) is arranged behind the impact surface ( 29 ) and protrudes into a valve chamber ( 28 ) that receives the valve element ( 4 ).

14. The sanitary outlet unit ( 1 ) as claimed in claim 1 , further comprising a flow straightener ( 20 ) arranged in the flow path ( 2 ) before the valve element ( 4 ).

15. The sanitary outlet unit ( 1 ) as claimed in claim 14 , wherein the flow straightener ( 20 ) has a multi-stage configuration, and includes at least one insert ( 34 ) that forms a step ( 21 , 22 ).

16. The sanitary outlet unit ( 1 ) as claimed in claim 14 , further comprising at least one through-flow nozzle ( 23 ) arranged in the flow path ( 2 ) between the flow straightener ( 20 ) and the valve element ( 4 ).

17. The sanitary outlet unit ( 1 ) as claimed in claim 1 , wherein the contact surface ( 6 ) bears on the counterpart surface ( 7 ) in a contact region ( 24 ), and a distance is formed outside of the contact region ( 24 ), and a surface area of the contact region ( 24 ) is smaller than a surface area of a surface ( 25 ) covered by the contact surface.

18. A method for actuating the sanitary outlet unit ( 1 ) as claimed in claim 1 , the method comprising:

arranging the valve element ( 4 ) in the flow path ( 2 ) in the housing ( 3 ) of the sanitary outlet unit,;

transferring the valve element ( 4 ) from the closed position to the open position lying above the closed position;

acting on the valve element ( 4 ), in the open position, by the pressure prevailing in the flow path ( 2 ), and pressing and holding the contact surface ( 6 ) of the valve element ( 4 ) against the counterpart surface ( 7 ) on the housing ( 3 ); and

after a pressure drop in the flow path ( 2 ), the valve element ( 4 ) automatically falling to the closed position to provide the positive flow rate to the outlet that is lower than the flow rate to the outlet prior to the pressure drop providing the automatic water saving function.

19. The method as claimed in claim 18 , wherein after the pressure drop in the flow path ( 2 ), the valve element ( 4 ) falls automatically to the closed position due to inherent weight thereof.

20. The method as claimed in claim 18 , wherein the pressure is generated by a flow obstacle arranged downstream from the valve element ( 4 ) in the open position.

21. The method as claimed in claim 18 , wherein when the valve element ( 4 ) is transferred to the open position, the method further comprises displacing water from a receiving space ( 10 ) for a displacement body ( 9 ) of the valve element ( 4 ) via at least one relief channel ( 12 ).

22. The method as claimed in claim 18 , further comprising holding the valve element ( 4 ), in the closed position, against a valve seat ( 15 ) by a pressure arising at the contact surface ( 6 ) in the flow path ( 2 ).