Patent ID: 6739843
Filing Date: 2004-05-25
Classification: F04B

Abstract:
A control valve comprising:a valve body opening and closing a valve hole; and a solenoid mechanism for urging the valve body by energizing a solenoid, the solenoid mechanism including: a yoke accommodating the solenoid, the yoke forming a magnetic path; a plunger housing made of stainless steel, the plunger housing connecting with the yoke, the plunger housing having a central axis; a fixed core connected to the yoke; and a plunger accommodated in the plunger housing, the plunger connecting with the valve body, wherein the plunger is attracted to the fixed core to move in the direction of the central axis by applying electromagnetic force from the solenoid, and wherein black oxide treatment is performed to the yoke after the plunger housing is fixed to the yoke.