Elektromagnetisch gesteuertes Ventil für ein Kraftstoffeinspritzsystem

摘要

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.