Patent ID: 7047997

Claim:
A device for venting a tank, comprising: a cover substantially closing an opening in the tank and comprising a valve housing; a vent port fluidly connected to the valve housing; a valve body inserted within the valve housing and defining a passage and comprising a valve seat circumferentially about the passage; a vent valve contained in the tank and comprising an neck having an end slidably received in the passage in the valve body so as to extend beyond the valve seat, said end comprising a plurality of vent windows; a shutoff valve supported within the vent body by said end spaced apart from said valve seat, said vent windows providing fluid communication between said passage and said vent port; and biasing means for urging the shutoff valve against the end and, upon displacement of the vent valve from the vent body, effective to urge the shutoff valve against the valve seat and thereby fluidly seal the vent port.