An improved fuel injector for an internal combustion engine generating very fine atomization of fuel even at the initiation of a valve opening event and including a cylindrical valve element terminating in a semi-spherical end portion which engages a valve seat to close the injector. The fuel quantity...http://www.google.de/patents/US5271563?utm_source=gb-gplus-sharePatent US5271563 - Fuel injector with a narrow annular space fuel chamber
