Vacuum sewer system

1. A vacuum sewer system comprising a sewage receptacle, sewer piping connected to the sewage receptacle by means of a discharge valve provided with an aeration means, a vacuum generating means for generating vacuum in the sewer piping, and a control mechanism for controlling the discharge valve and the aeration means, wherein (a) the control mechanism is configured to be activated in order to provide a primary vacuum connection between the vacuum generating means and the discharge valve in order to open the discharge valve and discharge the sewage receptacle while the aeration means remains closed, and (b) wherein the aeration means comprises a valve plate configured to open or close against a valve seat in the discharge valve, the aeration means configured to provide governed by an auxiliary vacuum that is activated after the control mechanism closes the primary vacuum connection, such that the valve plate is configured to be (i) withdrawn from the valve seat so that air is supplied directly to the discharge valve through the open valve seat for closing the discharge valve after a discharge or flushing sequence, and (ii) closed against the valve seat when the discharge valve is provided with the primary vacuum connection for opening the discharge valve for the discharge or flushing sequence.

2. The vacuum sewer system according to claim 1 , wherein the function of the aeration means is pneumatically governed.

3. The vacuum sewer system according to claim 1 , wherein the function of the aeration means is electrically governed.

4. The vacuum sewer system according to claim 1 , wherein the aeration means comprises a vent valve, which is attached to the discharge valve and connected to the control mechanism by means of a fourth conduit, and in that the aeration means is provided with an aeration nozzle.

5. The vacuum sewer system according to claim 4 , wherein the aeration means is arranged to be opened by vacuum provided from the discharge valve by way of a second conduit through the control mechanism and further through the fourth conduit to the aeration means in order to provide air to the discharge valve for closing the discharge valve after the discharge or flushing sequence, and in that the aeration means is arranged to be closed with a given delay after said discharge or flushing sequence by air provided through the aeration nozzle.

6. The vacuum sewer system according to claim 1 , wherein the aeration means comprises a vent valve, which is arranged in connection with the discharge valve and connected to the control mechanism by means of a fourth conduit, and in that a fifth conduit is provided between the aeration means and the discharge valve.

7. The vacuum sewer system according to claim 6 , wherein the aeration means is arranged to be opened by air provided by way of the fourth conduit through an aeration valve in the control mechanism in order to provide air to the discharge valve for closing the discharge valve after the discharge or flushing sequence, and wherein the aeration means is arranged to be closed by vacuum available in the control mechanism and provided by way of the fourth conduit.

8. The vacuum sewer system according to claim 3 , wherein the aeration means comprises a vent valve, which is attached to the discharge valve, and wherein the control mechanism is arranged to control the aeration means by way of a sensor device and a magnetic valve connected to the aeration means.

9. The vacuum sewer system according to claim 8 , wherein the aeration means is arranged to be opened by the magnetic valve when the sensor device reads that the vacuum connection to the discharge valve through the control mechanism is switched off in order to provide air to the discharge valve for closing the discharge valve after the discharge or flushing sequence, and wherein the aeration means is arranged to be closed when the sensor device reads that the vacuum connection to the discharge valve through the control mechanism is switched on.

10. A discharge valve for a vacuum sewer system comprising a sewage receptacle, sewer piping and a vacuum generating means for generating vacuum in the sewer piping, whereby the discharge valve is (a) provided with an aeration means, (b) arranged between the sewage receptacle and the sewer piping, and (c) controlled by a control mechanism, wherein the control mechanism is configured to be activated in order to provide a primary vacuum connection between the vacuum generating means and the discharge valve in order to open the discharge valve and discharge the sewage receptacle while the aeration means remains closed, wherein the aeration means is controlled by the control mechanism and comprises a valve plate arranged to open or close against a valve seat in the discharge valve and the valve plate is arranged to be withdrawn from the valve seat so that air is supplied directly to the discharge valve through the open valve seat for closing the discharge valve after a discharge or flushing sequence and arranged to be closed against the valve seat when the discharge valve is provided with vacuum for opening the discharge valve for the discharge or flushing sequence, wherein the aeration means configured to provide is governed by an auxiliary vacuum that is activated after the control mechanism closes the primary vacuum connection.

11. The discharge valve according to claim 10 , wherein the function of the aeration means is pneumatically governed.

12. The discharge valve according to claim 10 , wherein the function of the aeration means is electrically governed.

13. The discharge valve according to claim 10 , wherein the aeration means comprises a vent valve, which is attached to the discharge valve and connected to the control mechanism by means of a fourth conduit, and in that the aeration means is provided with an aeration nozzle.

14. The discharge valve according to claim 13 , wherein the aeration means is arranged to be opened by vacuum provided from the discharge valve by way of a second conduit through the control mechanism and further through the fourth conduit to the aeration means in order to provide air to the discharge valve for closing the discharge valve after the discharge or flushing sequence, and in that the aeration means is arranged to be closed with a given delay after said discharge or flushing sequence by air provided through the aeration nozzle.

15. The discharge valve according to claim 10 , wherein the aeration means comprises a vent valve, which is arranged in connection with the discharge valve and connected to the control mechanism by means of a fourth conduit, and in that a fifth conduit is provided between the aeration means and the discharge valve.

16. The discharge valve according to claim 15 , wherein the aeration means is arranged to be opened by air provided by way of the fourth conduit through an aeration valve in the control mechanism in order to provide air to the discharge valve for closing the discharge valve after the discharge or flushing sequence, and in that the aeration means is arranged to be closed by vacuum available in the control mechanism and provided by way of the fourth conduit.

17. The discharge valve according to claim 12 , wherein the aeration means comprises a vent valve, which is attached to the discharge valve, and in that the control mechanism is arranged to control the aeration means by way of a sensor device and a magnetic valve connected to the aeration means.

18. The discharge valve according to claim 17 , wherein the aeration means is arranged to be opened by the magnetic valve when the sensor device reads that the vacuum connection to the discharge valve through the control mechanism is switched off in order to provide air to the discharge valve for closing the discharge valve after the discharge or flushing sequence, and in that the aeration means is arranged to be closed when the sensor device reads that the vacuum connection to the discharge valve through the control mechanism is switched on.