Patent ID: 7770241
Filing Date: 2010-08-10
Classification: E03D,E03F

Abstract:
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 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after the control mechanism closes the primary vacuum connection, such that the valve plate is configured to be (i) withdrawn from the valve seat so that air is supplied directly to the discharge valve through the open valve seat for closing the discharge valve after a discharge or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.