A sealing shaft (23) with a conical male surface (48) is seated in a female conical valve seat (15). Sealing shaft (23) is attached to a pole piece (13) which, when energized by a solenoid coil (30), causes the sealing shaft to be pulled away from valve seat (15), resulting in release of fuel. A hollow...http://www.google.es/patents/US5330100?utm_source=gb-gplus-sharePatente US5330100 - Ultrasonic fuel injector
