Easy opening fuel tank vent valve

摘要

A vent valve for use in controlling discharge of fuel vapor from a fuel tank. The vent valve includes a housing for attachment to the fuel tank includes a wall defining a cavity therein. The float is contained in the cavity of the housing and is responsive to the level of liquid in the fuel tank. The level in the fuel tank rises, the float rises within the housing. When the level of liquid in the fuel tank drops, the float moves downwardly in the housing. A passage is provided in the housing which communicates with an external portion of the tank. The vent valve includes at least one vent positioned proximate to and communicating with the passage for providing venting passage of vapor therethrough and to the passage. The vent valve includes a vent assembly having a flexible diaphragm which is displaceably positioned proximate to the passage to control the flow of vapor through the vent and through the passage. The diaphragm is attached to the float making it responsive to the rise and fall of liquid level in the tank. The diaphragm is generally concentrically peeled from a position overlying at least the vent or progressively opening and closing the vent.