Electromagnetic fuel injector comprising flexible element for positioning armature

An fuel injector comprising:

• a body having a fuel inlet and a fuel outlet;
• a base comprising a valve seat connected to said body;
• a disk-shaped armature disposed at said fuel outlet for controlling the flow of fuel from the inlet to the outlet, said armature having an upper surface and a lower surface, said lower surface comprising a sealing interface with said valve seat;
• a return spring for acting on the central portion of the disk-shaped armature with a first spring bias to urge the armature against the valve seat;
• and
• a flexible element comprising a ring portion and a plurality of flexible legs, said flexible element being disposed between said body and said upper surface of said armature, said flexible element providing a second spring bias between said body and said armature upper surface and providing bias force to the outer annular region of the disk-shaped armature;
• wherein, when said injector is closed, spring bias between said body and said armature upper surface maintains said armature in a sealing position with said valve seat, and when said injector is open, increased spring bias between said body and said armature upper surface impels said armature to return to a sealing position with said valve seat.