| 摘要 |
A solenoid valve for brake systems, including a spool movably set in a valve housing, provided along its central axis with the first orifice which has a predetermined diameter, and provided at a position around the plunger with a plunger guide having a predetermined depth for allowing the plunger to enter the spool, thus opening and closing the first orifice. A valve seat portion is formed on the inner surface of the bore of the valve housing by stepping the surface. This valve seat portion defines the second orifice therein, and comes into contact with or spaced from the end of the spool to selectively open the outlet, separately from the first orifice when the spool moves in either direction. The second orifice has an inner diameter larger than that of the first orifice. A spool restoring spring normally biases the spool toward the plunger.
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