Importance

Loading Importance Indicators...

Abstract

A vent valve for use with a liquid-containing tank, particularly a gasoline tank carried by a vehicle that customarily travels over hilly terrain. The valve includes a cylindrical housing, within which a check ball and a float ball are each positioned for limited movement within the housing. The check ball and float ball are adapted to be in contact with each other, and the check ball is movable toward and away from a vent aperture provided at the top of the housing. A plurality of guide ribs are provided interiorly of the housing to confine the movement of the check ball to axial movement toward and away from the vent aperture. The check ball is preferably made from a material that has a specific gravity that is substantially greater than that of the liquid contained in the tank, and the float ball is preferably made from a material and is constructed such that is has a specific gravity substantially less than that of the liquid in the tank. The valve serves to prevent the passage through the valve structure of liquid, but to permit the passage therethough of gases and vapors when the vent is in its normal operating position.

Loading the Abstract Image...

First Claim