Valve armature and valve cartridge for a solenoid valve

A valve cartridge for a solenoid valve, comprising:

• a guide sleeve;
• a valve armature guided in its axial movement inside the guide sleeve between a closed position and an open position, against the force of a return spring, the valve armature including a tappet having a tappet basic body and a closing element, the tappet basic body composed of plastic;
• and
• a valve sleeve connected to the guide sleeve, the valve sleeve having a valve seat, which is arranged between at least one first flow opening and at least one second flow opening,
• wherein:
• the closing element in the closed position interacts with the valve seat to seal the valve seat and interrupts a fluid flow between at least the one first flow opening and at least the one second flow opening,
• the closing element in the open position is lifted off from the valve seat and allows the fluid flow between at least the one first flow opening and at least the one second flow opening,
• the valve armature further includes a basic body of a magnetically conductive metal, the basic body defining a depression arranged on one end of the basic body, the depression having an opening through which the tappet basic body is configured to be received in the depression,
• the basic body has an annular groove that is connected to the depression and spaced from the opening so as to form an edge to the depression in the direction of the opening, and
• the tappet basic body is configured to form an interference fit with the basic body, the interference fit causing plastic deformations of the tappet basic body, which are received in the annular groove and form a positive interlock with the edge so as to fix the tappet basic body in the depression.