Flat seat valve, in particular, for the control of fuel metering devices

A flat seat valve for the control of the flow of a fluid medium, comprising

• a valve housing;
• a control membrane clamped-in fixedly across the interior of said housing such that the membrane lies in a plane which extends substantially transversely with respect to the housing and divides the interior of said housing into two spaces, said membrane having at least one aperture establishing free communication between the two spaces;
• a solenoid adapted for axially displacing said membrane when energized, said solenoid comprising an exciting winding, a magnetic core and an armature arranged about one of said sleeves, said armature comprises an external annular flange extending radially past said exciting coil and magnetic core in the interior of said housing;
• first valve seat-bearing means stationary in said housing on one side of said membrane;
• and
• second valve seat-bearing means stationary in said housing on the opposite side of said membrane each said valve seat-bearing means comprises a tubular sleeve which projects from an interior wall of said housing toward said membrane therein and includes a valve seat at its end adjacent said membrane, said valve seats being of different diameter and defining along with their respective tubular sleeves a flowpath for said fluid medium;
• Whereby displacement of the membrane produces a change in the distance of said membrane from one of said valve seats and hence in the width of the one flowpath past said valve seat and a change in the opposite sense in the distance of the membrane from, and hence the width of the other flowpath past, said other valve seat.