Patent ID: 6029704
Filing Date: 2000-02-29
Classification: F16K,Y10T

Abstract:
An electromagnetic control valve comprising:a spool section for switching fluid passages on or off, said spool section including a spool and a sleeve;a solenoid section, connected to said spool section, for driving said spool in one direction, said solenoid section including a unitary magnetic stator made of a material that is changeable from magnetic to non-magnetic according to a processing thereof, a maonetic yoke disposed to surround said stator, and a magnetic coil disposed between said stator and said yoke, said stator having an open end fixed to said sleeve, a cylindrical portion, and a bottom end said cylindrical portion comprising a non-magnetic portion at a middle thereof where the material thereof has been processed so as to have been changed from magnetic to non-masnetic;a magnetic moving core slidably disposed in said cylindrical portion of said stator;a shaft fixed to said moving core; anda spring member for biasing said spool in a direction opposite to said one direction.