Patent ID: 6321781
Filing Date: 2001-11-27
Classification: F16K,Y10T

Abstract:
Apparatus for monitoring operation of an electromagnetically actuated valve comprising a coil, a yoke including a casing supporting the coil, an armature operatively associated with the coil so as to be displaced upon energization of the coil to a changeover position, a spring acting on the armature to urge the armature to a home position when the coil is deenergized, an annular magnet on said armature, a Hall-effect sensor switch secured to said yoke in facing relation with said annular magnet, said Hall-effect sensor switch having open and closed positions and being in said open position when the armature is in said home position and being in said closed position when the armature is displaced through a determined stroke to said changeover position when the coil is energized, a short circuiting ring supported by said yoke adjacent to said Hall-effect sensor switch at a position to face said magnet when the armature is displaced through said determined stroke to said changeover position, and an evaluation unit connected to said Hall-effect sensor switch to indicate whether or not said armature has been displaced upon energization of said coil.