Patent ID: 6460567
Filing Date: 2002-10-08
Classification: F16K,Y10T

Abstract:
A motor operated valve including a valve body having at least one inlet and at least one outlet, at least one inlet flow passage and at least one outlet flow passage, at least one valve closing member positioned between said inlet and said outlet passage, at least one valve seating means within said body, said at least one valve closing member mounted for movement between open and closed positions, an armature and a drive member for moving said valve closing member, said drive member and said valve closing member being operatively attached so that rotation of said armature and said drive member cause movement of said valve closing member, said armature having a plurality of spaced apart permanent magnets embedded therein, at least one bearing assembly associated with one of said drive member and said armature, said armature being enclosed by a magnetically transparent enclosure closed at one end and hermetically sealed at its other end to said valve body, and, lying closely outside said enclosure, a drive stator, said drive stator including drive windings and plural Hall-effect devices for commutation of said windings.