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A control valve for use in a fuel injection system of an engine comprises a valve member of plate like form and movable in an inlet chamber between a first seating and a second seating on opposite sides of the valve member. The first sealing is smaller in diameter than the second seating and surroun

A control valve for use in a fuel injection system of an engine comprises a valve member of plate like form and movable in an inlet chamber between a first seating and a second seating on opposite sides of the valve member. The first sealing is smaller in diameter than the second seating and surrounds a spill flow passage. The inlet chamber connects in use with the pump chamber of a fuel pump. When the valve member is in contact with the second seating a control chamber is formed which is connected by a restricted passage to the pump chamber. Flow of liquid from the control chamber is controlled by a valve element which is movable by an actuator and which conveniently controls flow through an opening in the valve member. In the closed position of the valve member it engages the first seating and the opening is closed by the element. In order to open the valve the opening is uncovered by the valve element and the unbalanced pressure on the opposite sides of the valve member move the valve member to the open position and into contact with the second seating. Reclosure of the valve is achieved by covering the opening.

대표청구항 ▼

An electromagnetically controlled valve for use in a fuel injection system of an internal combustion engine comprising a body defining a first annular seating about a flow passage extending in use to a drain, said body defining an inlet chamber about said first seating for connection in use to a hig

An electromagnetically controlled valve for use in a fuel injection system of an internal combustion engine comprising a body defining a first annular seating about a flow passage extending in use to a drain, said body defining an inlet chamber about said first seating for connection in use to a high pressure fuel source of the system, a second annular seating facing but spaced from said first seating and enclosing a larger area than the area enclosed by said first seating, a plate valve member movable between the seatings to contact said first seating when the electromagnetically controlled valve is closed and to contact said second seating when the electromagnetically controlled valve is open, said plate valve member when engaging said second seating defining therewith a control chamber which has an area that is larger than that area enclosed by said first seating, first passage means connecting said control chamber with said inlet chamber, second passage means connecting said control chamber with a drain, and an electromagnetically operated valve element for controlling fuel flow through said second passage means, said electromagnetically operated valve element being movable to close said second passage means in the closed position of the electromagnetically operated valve element and to open said second passage means in the open position of said electromagnetically operated valve element, the arrangement and relative sizes of said areas being such that in the open position of said electromagnetically operated valve element the force developed by the fuel flowing through said body on the face of the plate valve member lying outside said first seating and tending to urge the electromagnetically controlled valve open will exceed the force on the plate valve member which tends to urge the electromagnetically controlled valve closed to urge the plate valve member into contact with said second seating, and in the closed position of the electromagnetically operated valve element the force associated with pressure of fuel in the control chamber on the plate valve member which tends to urge the electromagnetically controlled valve closed will exceed the force on the plate valve member which tends to urge the electromagnetically controlled valve open to urge the plate valve member towards the first seating.