Patent ID: 8459013

Claim:
A urea tank assembly for a urea delivery system for delivering urea to and receiving urea from an exhaust treatment system of a vehicle, the vehicle comprising an engine coolant system, the urea tank assembly comprising: a urea tank body defining an interior urea storage chamber; the tank body comprising a tank opening at an upper portion of the tank body; a tank closure member detachably mounted to the tank body so as to cover the tank opening, the tank closure member comprising a closure member body, the closure member body comprising a urea inlet communicating with the urea storage chamber and for coupling to the exhaust treatment system of the vehicle for use in returning urea from the exhaust treatment system to the urea storage chamber, a urea outlet communicating with the urea storage chamber and for coupling to the vehicle exhaust treatment system for use in delivering urea from the urea storage chamber to the exhaust treatment system, a coolant inlet for coupling to the vehicle coolant system and a coolant inlet passageway communicating from the coolant inlet through the closure member body, a coolant outlet for coupling to the vehicle coolant system and a coolant outlet passageway communicating from the coolant outlet through the closure member body, a heating conduit positioned within the interior urea storage chamber and communicating from the coolant inlet passageway to the coolant outlet passageway, the closure member body also comprising a valve body and valve within the valve body that is operable to selectively open and close at least one of the coolant inlet passageway and the coolant outlet passageway so as to selectively permit the flow of coolant from the vehicle coolant system, through the coolant inlet, through the coolant passageway, through the heating conduit, through the coolant outlet passageway, through the coolant outlet and back to the vehicle coolant system.