| 摘要 |
Provided is a solenoid valve wherein control characteristics are prevented from deteriorating due to changes of magnetic characteristics of a magnetic circuit when a center post is contaminated, and the desired control characteristics are maintained for a long period of time. In the solenoid valve, a nonmagnetic layer (41) is formed on the surface of a center post (40) by electroless nickel-phosphorous plating or composite electroless nickel-phosphorous plating containing PTFE. Thus, contamination of the center post (40) is remarkably suppressed, the characteristics of the magnetic circuit for moving the plunger (30) by magnetic attraction are prevented from changing due to changes of magnetic permeability between the plunger (30) and the center post (40), the plunger (30) and a valve element (55) integrated with the plunger are suitably moved corresponding to a current applied to a coil (20), and the valve is opened/closed.
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