Needle and seat valve assembly

A valve assembly for controlling the flow of fuel from a fuel supply to a fuel chamber of a carburetor, the valve assembly comprising

• a needle, and
• a housing having an inlet, an outlet in fluid communication with the inlet, and an interior region therebetween receiving the needle for movement between a closed position blocking the flow between the inlet and the outlet and an open position allowing the flow of fluid between the inlet and the outlet, the needle including a post and a skirt fixed to the post and extending radially outward therefrom, and the skirt being positioned along the post to restrict the flow of fuel through the outlet so that the outlet and the skirt define the variable outlet orifice.

A valve assembly for controlling the flow of fuel from a fuel supply to a fuel chamber of a carburetor, the valve assembly comprising

• a needle,
• a housing including a wall defining an inlet opening, an outlet opening, and a generally cylindrical interior region between the inlet opening and the outlet opening, the interior region receiving the needle for movement between a closed position blocking the flow of fuel between the inlet and the outlet and an open position allowing the flow of fuel between the inlet and the outlet, the outlet opening extending generally radially from the interior region so that the interior region is in fluid communication with the fuel chamber of the carburetor through the outlet opening, and
• means for restricting the flow of fuel through the outlet, the restricting means including the housing which is formed so that the length of the outlet opening is maximized and an annular skirt fixed to the needle and extending radially outwardly therefrom.

A valve assembly for controlling the flow of fuel to the fuel chamber of a carburetor of an engine in response to the position of an actuator coupled to the fuel chamber, the valve assembly comprising

• a housing including an inlet, an outlet in fluid communication with the inlet, and an interior region therebetween,
• a needle received in the interior region of the housing and movable relative thereto between a closed position blocking the flow of fuel between the inlet and the outlet and an open position allowing the flow of fuel between the inlet and the outlet, and
• coupling means for coupling the needle to the housing so that the needle vibrates with the housing in response to vibration of the engine, the coupling means allowing movement of the needle relative to the housing in response to movement of the actuator relative to the fuel chamber, wherein the housing defines a bottom opening and the coupling means includes a bottom cap attached to the housing and covering the bottom opening, the bottom cap including an edge defying an opening receiving the needle, the needle and the edge defining a gap therebetween and cooperating to restrict the flow of fuel through the gap.

A valve assembly for controlling the flow of fuel from a fuel supply to a fuel chamber of a carburetor, the valve assembly comprising

• a housing having an inlet, an outlet in fluid communication with the inlet, an, interior region therebetween, and a bottom opening in fluid communication with the interior region,
• a needle received in the interior region of the housing for movement relative thereto between a closed position blocking the flow of fuel between the inlet and the outlet and an open position allowing the flow of fuel between the inlet and the outlet, and
• partitioning means connected to the needle for dividing the interior region into a first portion communicating with the fuel supply via the inlet and a second portion communicating with the fuel chamber of the carburetor via the bottom opening, the partitioning means including means for restricting communication between the first portion and the second portion of the interior region.

A valve assembly for controlling the flow of fuel to a fuel chamber of a carburetor, the valve assembly comprising

• a housing including an inlet, an outlet in fluid communication with the inlet, an interior region therebetween, and a bottom opening in fluid communication with the interior region,
• a bottom cap attached to the housing and covering the bottom opening, the bottom cap including an edge defining an opening adjacent the bottom opening of the housing, and
• a needle received in the interior region of the housing for movement relative thereto between a closed position blocking the flow of fuel between the inlet and the outlet and an open position allowing the flow of fuel between the inlet and the outlet, the needle including a post extending through the opening of the bottom cap and a skirt connected to the post and cooperating with the housing to restrict the flow of fuel therebetween so that the needle is coupled to the housing to move therewith in response to vibration of the housing.

A valve assembly for controlling the flow of fuel to a fuel chamber of a carburetor, the valve assembly comprising

• a housing including a wall defining an inlet, an outlet in fluid communication with the inlet, and an interior region therebetween,
• a needle received in the interior region of the housing for reciprocating movement relative thereto, and
• partitioning means on the needle for partitioning the interior region into a first portion communicating with the inlet and a second portion, the partitioning means including an outer edge positioned in the interior region to define a clearance gap of about 0.002 inches (0.05 mm) between the wall of the housing and the outer edge during reciprocating movement of the needle in the interior region so that movement of the needle relative to the housing is dampened and the needle is coupled to the housing to move therewith in response to vibration of the housing.