Patent ID: 6729278
Filing Date: 2004-05-04
Classification: F01L

Abstract:
A dual lift electromechanical actuator for a valve, comprising:a movable valve-actuating shaft for actuating said valve, a first valve-closing electromagnet and a second valve-opening electromagnet spaced apart along a length of said valve-actuating shaft, said valve-actuating shaft having an armature disposed between said first electromagnet and said second electromagnet, said armature being moved by energization of said first electromagnet to a first armature position that establishes a valve closed position and by energization of said second electromagnet to a second armature position that establishes a first lift position of said valve, and a tubular guide member which receives said valve-actuating shaft and which is movable relative thereto to a location between said first electromagnet and said second electromagnet to define a third armature position where said armature resides on said guide member when said first electromagnet and said second electromagnet are de-energized, said third armature position establishing a second lift position of said valve.