Control valve for use in a reservoir injection system for a diesel engine

A control valve for use in a fuel reservoir injection system having a fuel injector with a pressure intensifier fitted upstream of the control valve, the control valve comprising:

• a housing having a valve chamber formed therein, an inlet connection, an outlet connection, and a return connection;
• a first valve body disposed and axially movable within said valve chamber, said first valve body forming a first seat valve which can selectively create a fluid connection between said outlet connection and said return connection;
• a second valve body forming a second seat valve, said first seat valve disposed between said outlet connection and said return connection and being normally closed, said second seat valve disposed between said inlet connection and said outlet connection and being normally open;
• and
• an armature plate and a magnet unit disposed opposite said armature plate, said second valve body being connected to said armature plate;
• wherein during an activation of said magnet unit, said second valve body moves first and closes said second seat valve before said first valve body moves, entrained by said second valve body, and opens said first seat valve.