Patent ID: 6453947
Filing Date: 2002-09-24
Classification: F16K,G05D,Y10T

Abstract:
An electromagnetic valve comprising:a bobbin, accommodated in a case and wound by a coil; a core located in a central portion of the bobbin and forming a magnetic circuit; a movable iron core, sucked in a direction of the core when a current is applied to the coil, so as to move between a first position when no current is applied to the coil and a second position when current is applied to the coil; a rod integrally assembled with the movable iron core; a spool valve, pushed by the rod between a first spool valve position and a second spool valve position corresponding with the first and second positions of said movable iron core; a housing guiding the spool valve; and a feed-back chamber, formed by steps of the spool valve and of the housing, wherein a sealing portion, formed by the spool valve and the housing between an input port and the feed-back chamber, has a length, which is not changed by movement of the spool valve between said first spool valve position and said second spool valve position.