公开(公告)号：EP2128503A4

公开(公告)日：2016-10-05

申请号：EP08738670

申请日：2008-03-19

申请人： EAGLE IND CO LTD

发明人： OGAWA HIDEO

IPC分类号： F16K31/06

CPC分类号： F16K31/0603 ,  F16K31/0655 ,  H01F7/08 ,  H01F7/128 ,  Y10T29/49405

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.