ELECTROMAGNETIC VALVE Russian patent published in 1999 - IPC

FIELD: shutoff valves for engine injection systems using compression and forced ignition of fuel mixture. SUBSTANCE: at least one wedge-shaped section is provided on surface of at least one of butt ends of electromagnetic valve armature and core facing each other which is inclined to longitudinal axis of valve. In addition, stop section of desired width is made on mentioned surface. This width remains constant throughout entire service life of valve. Stop surface wear in the course of long- time service does not cause increase in contact width. Core and/or armature is coated with magnetic material in vicinity of its butt end. Armature or core may be hardened in vicinity of butt end. EFFECT: provision for preventing wear of stop surfaces and for maintaining constant the pull-in and drop-out time of valve moving part. 9 cl, 5 dwg