Check valve

1. A check valve installed in a bore of a modulator block having an inlet path and an outlet path and configured to control oil to flow in one direction, the check valve comprising:

a valve housing disposed in the bore and including an inlet and an outlet configured to respectively communicate with the inlet path and the outlet path, wherein the valve housing has an internal path, which communicates with the outlet and the outlet path, inside the valve housing and an open upper portion opened at an upper side of the valve housing;

a cap member configured to seal the open upper portion of the valve housing, wherein the cap member is fixed to the modulator block;

a plunger configured to move upward or downward in the valve housing and configured to open or close the internal path between the inlet and the outlet; and

a spring disposed between the cap member and the plunger inside the internal path and configured to press the plunger to close the internal path, such that a fluid, which is introduced into the inlet through the inlet path, flows out to the outlet through the internal path and the outlet path sequentially,

wherein the valve housing includes a first body, an inclined portion, and a second body,

wherein the inclined portion is connected between the first body and the second body, and tapered downward between the inlet and the outlet,

wherein the second body has an outer diameter smaller than that of the first body and has a cup shape extending downwards from the inclined portion, and

wherein the plunger includes an end groove grooved at a center end thereof so as to face the inlet.

2. The check valve of claim 1 ,

wherein the inclined portion is configured to support a lower portion of the plunger.

3. The check valve of claim 2 , wherein an inclined surface of the inclined portion has a tapered shape.

4. The check valve of claim 3 , wherein the plunger has a contact surface corresponding to the inclined surface at the lower portion of the plunger to come into surface contact with the inclined surface.

5. The check valve of claim 4 , wherein the plunger comprises:

an accommodation groove circumferentially grooved in a ring shape at the lower portion of the plunger; and

a sealing member having a ring shape to correspond to the accommodation groove, wherein the sealing member is disposed in the accommodation groove and pressed against the inclined surface.

6. The check valve of claim 1 , wherein the cap member includes:

an insertion groove at a lower portion of the cap member,

wherein the plunger comprises a rod which is inserted into the insertion groove and configured to guide movement of the plunger.

7. The check valve of claim 6 , wherein the rod has a slot, through which the insertion groove communicates with the internal path of the valve housing, at an outside surface of the rod.

8. The check valve of claim 7 , wherein the slot includes first to third slots disposed at intervals of 120° along a circumference of the rod.

9. The check valve of claim 1 , wherein the cap member includes a supporting protrusion inserted into the spring and configured to support the spring under the cap member.