Valve for anti-lock brake system

1. A valve for an anti-lock brake system, the valve comprising:

a valve core;

an armature positioned below the valve core and provided at an end thereof with a ball;

a cylindrical sleeve coupled with outer peripheral surfaces of the valve core and the armature to guide an up/down movement of the armature;

a first elastic member installed between the valve core and the armature;

a valve housing coupled to one end of the cylindrical sleeve and formed therein with a hollow section that extends lengthwise along the valve housing, the valve housing having a groove circumferentially located on its bottom surface;

a valve seat press-fitted into the hollow section and formed with a first orifice which is open/closed by the ball; and

a filter seat press-fitted into the valve housing and provided with an inlet and an outlet, which are positioned at a circumferential portion and a lower portion of the filter seat, respectively,

wherein the filter seat has a large-diameter section press-fitted into the groove of the valve housing and a small-diameter section press-fitted into an outlet fluid path of the valve seat,

and the filter seat has a step section having a step shape cross-section view and disposed at an inner circumferential side surface of the large-diameter section such that the bottom surface of the valve housing is securely press-fitted to the step section.

2. The valve as claimed in claim 1 , wherein a filter for filtering fluid is installed in the inlet.

3. The valve as claimed in claim 1 , wherein the small-diameter section is provided at a lower portion thereof with a second orifice for adjusting a flow rate of fluid that flows out to the outlet.

4. The valve as claimed in claim 1 , wherein an orifice bush having a second orifice, which adjusts a flow rate of fluid that flows out to the outlet, is press-fitted into an outlet fluid path and the outlet of the valve seat.