초록 ▼

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 che

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.

대표청구항 ▼

A vent valve for permitting the flow therethrough of gases and vapors from a tank and for preventing the flow therethrough of liquid contained within the tank, said valve comprising: a) a valve body having an axis and including mounting means for mounting the valve body irma wall of a tank, the valv

A vent valve for permitting the flow therethrough of gases and vapors from a tank and for preventing the flow therethrough of liquid contained within the tank, said valve comprising: a) a valve body having an axis and including mounting means for mounting the valve body irma wall of a tank, the valve body including an inlet opening adapted to communicate with the interior of the tank and an outlet opening communicating with the outside of the tank; b) flow passageway means within the valve body for providing communication between the valve body inlet opening and the valve body outlet opening; c) flow check means positioned within the flow passageway means for movement toward and away from the outlet opening, wherein contact by the check means with the outlet opening closes the opening to prevent flow therethrough, the check means having a specific gravity greater than the specific gravity of a liquid contained within the tank so that the check means is incapable of floating in the liquid contained in the tank, and wherein the flow passageway means includes axially extending guide means adjacent the outlet opening for guiding the check means for movement in an axial direction, relative to the valve body, toward and way from the outlet opening and preventing lateral movement; d) float means positioned within the flow passageway means for movement toward and away for the outlet opening and positioned on the opposite side of the check means from the outlet opening, the float means having a specific gravity less than the specific gravity of the liquid contained in the tank so that the float means floats on the surface of the liquid contained within the tank, the float means having a size greater than that of the check means to prevent passage of the check means around the float means; and e) the inlet opening having a create area than the at of the outlet opening, wherein each of the check means and the float means is positioned relative to the flow passageway means to permit the passage therearound and through the valve body of gases and vapors and to prevent the passage through the valve body of liquid contained within the tank, and wherein the buoyant force of liquid action on the float means is greater than the force of gravity acting on the float means and on the check means and causes the float means to move toward the check means to move the check means into sealing contact with the outlet opening to prevent the passage of liquid through the outlet opening.