Abstract Described is a valve and a system employing such valve to control fuel vapor-loss from the bowl of a carburetor. In the fuel vapor-loss control system, the valve is positioned between the fuel bowl of the carburetor and the air cleaner attached to it. In the preferred form, the valve has a valve body including three passages. The first passage extends from the carburetor fuel bowl to a point within the air cleaner. The second passage is located in part within the first passage, but includes a second part extending to a point outside of the first passage. A third passage is connected with the carburetor fuel bowl and with a canister for the storage of fuel vapor. The second passage in the valve body has a movable member for preventing flow of vapor from the fuel bowl of the carburetor to the air cleaner when the movable member is in contact with a valve seat. Movement of the movable member is controlled by engine manifold vacuum attached to one end of the second passage in the valve body.
A valve for controlling a fluid at or near atmospheric pressure, which comprises: a valve body, said valve body having a first passage of circular cross-section extending in one direction, said first passage having inlet and outlet openings, and said valve body having a second passage, said second passage having a cup-shaped first portion and a first opening associated therewith, said first portion being located within said first passage wiTh said first opening being spaced from said first passage inlet opening and said first portion of said second passage extending therefrom toward said first passage outlet opening, and said second passage having a second portion and a second opening associated therewith, said second opening of said second passage being located outside of said first passage; a valve seat insert positioned in said first passage inlet opening in spaced relation with said first opening of said first portion of said second passage; and means movable within said first portion of said second passage and responsive to the force of gravity for preventing flow of fluid from said first passage inlet opening to said first passage outlet opening when said movable means is in contact with said valve seat insert, said movable means being responsive to the application of a vacuum to said second opening of said second passage thereby to permit fluid flow from said first passage inlet opening to said first passage outlet opening.
Claim 2
Dependent Claim
234 words
A valve for controlling a fluid at or near atmospheric pressure, which comprises: a valve body, said valve body having a first passage of circular cross-section extending in one direction, said first passage having inlet and outlet openings, and said valve body having a second passage, said second passage having a cup-shaped first portion and a first opening associated therewith, said first portion being located within said first passage wiTh said first opening being spaced from said first passage inlet opening and said first portion of said second passage extending therefrom toward said first passage outlet opening, and said second passage having a second portion and a second opening associated therewith, said second opening of said second passage being located outside of said first passage; a valve seat insert positioned in said first passage inlet opening in spaced relation with said first opening of said first portion of said second passage; and means movable within said first portion of said second passage and responsive to the force of gravity for preventing flow of fluid from said first passage inlet opening to said first passage outlet opening when said movable means is in contact with said valve seat insert, said movable means being responsive to the application of a vacuum to said second opening of said second passage thereby to permit fluid flow from said first passage inlet opening to said first passage outlet opening.