Abstract: A 3-position 3-way solenoid valve for anti-lock brake system is disclosed having a hinge structure. The solenoid valve includes a cylindrical housing and two covers hermetically coupled to both ends of the housing. The housing and two covers define an inner chamber which is partitioned into first and second chambers by a barrier, and first to third ports are communicated with the first chamber. The second chamber contains an armature, a solenoid assembly and a core, and the armature is fixed to a push rod which extends into the first chamber through a barrier hole. An end of the push rod in the first chamber is fitted to a ball slider within which a ball is included interposing a first spring. A second spring interposes between the cover defining the first chamber and one end of the ball slider. A step is formed on the outer wall of the ball slider. A valve lever extends substantially parallel with the ball slider to be caught with the step.

Abstract: A 2-position 3-way solenoid valve having first, second and third ports and first and second chambers. The first chamber is communicated with the first port and the second chamber is communicated with the second and third ports. The chambers is partitioned by a barrier wall and are communicated with each other by a opening formed to the barrier wall. In response to a valve-actuated signal, a spool is moved in lengthwise direction, so that the opening and the third port are opened alternatively. When the third port is closed, the hydraulic pressure generated from a hydraulic pump is supplied to a brake wheel cylinder through the first and second ports to increase braking pressure. When the opening is closed, the hydraulic pressure within the brake wheel cylinder is decreased through the second and third ports to decrease braking pressure.