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Unlike conventional sanitation systems the pipe network in a vacuum system is constantly under negative pressure and therefore there is no leakage of wastewater. A central vacuum station, comprising vacuum pumps, receiver tank, transfer pumps and associated controls etc, is generally located in the cellar of a building.The various sanitary fittings are each connected to the system via an interface valve. Each valve is activated either by pushing a button or automatically. The differential pressure across the valve evacuates the wastewater and the interface valve automatically closes after a few seconds. All wastewater is conveyed to the vacuum station receiver tank from where it is pumped in batches to the public sewer.
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