Electromagnetic valve

Abstract

An is an electromagnetic valve disposed in a fluid passage to open or close the passage. A solenoid and a guide member having a guide hole are disposed in the housing. A plunger is disposed between the solenoid and the guide member and responds to energization of the solenoid. A valve member, which is coupled to the plunger to open or close the fluid passage in accordance with an energization state of the solenoid, is slidably fitted in the guide hole of the guide member. The plunger is made of a magnetic material, while of the guide member and the valve member, at least the valve member is made of a non-magnetic material and has an outer surface thereof subjected to a nitriding process. This prevents adhesion of iron powder to the valve member, eliminates an adverse influence of the magnetic field of the solenoid, and further improves the corrosion resistance and wear resistance thus ensuring smooth actuation of the valve member.

Dependencies are inferred from the claim text.