Patent ID: 7766303

Claim:
An electromagnetic valve apparatus comprising: an E-shaped core having an embedded coil; an I-shaped armature located facing said core so as to be able to be driven by electromagnetic force; wherein said E-shaped core has a surface facing said I-shaped armature, and said I-shaped armature has a surface located facing said surface of said E-shaped core with a small gap between said surface of said E-shaped core and said surface of said I-shaped armature; wherein a gap width of said small gap between said surface of said E-shaped core and said surface of said I-shaped armature is smaller at central parts of said surface of said E-shaped core and said surface of said I-shaped armature than a gap width at peripheral parts of said surface of said E-shaped core and said surface of said I-shaped armature; wherein said I-shaped armature has at least one passage hole therein that connects said small gap on one side of said I-shaped armature with a side of said I-shaped armature opposite to said one side so that fluid can flow between said sides; and wherein said at least one passage hole has a tapered portion at one side thereof facing the surface of the E-shaped core, said one side is formed in a cone shape broadening toward the surface of the E-shaped core, and another side of said at least one passage hole opposite to the tapered portion of the passage hole is formed in a cylindrical shape.