Patent ID: 8424121

Claim:
An odor extraction device for a toilet pan, said odor extraction device comprising: an inlet configured for gas communication with an interior of the toilet pan above a water level in the pan; an outlet in gas communication with the inlet and configured for gas communication with a sewerage pipe; a suction apparatus intermediate the inlet and the outlet, configured to draw gas from within the pan in through the inlet and out through the outlet; a one way valve between the inlet and the outlet, the valve comprising a valve member and a valve seat, the valve member being biased, by gravity, toward a closed position blocking fluid communication between the inlet and the outlet by sealing engagement of the valve member with the valve seat, wherein fluid pressure generated by the suction apparatus disengages the valve member from the valve seat to allow the gas to flow through the valve; and a substantially airtight housing intermediate the inlet and the outlet, the housing containing the suction apparatus and the valve member, wherein the housing includes a guide post along which the valve member is axially slidable between an open position and the closed position.