Check valve having reverse-direction fluid supply function

A check valve having a reverse-direction fluid supply function, the check valve comprising:

• a valve main body into which a fluid is introduced, wherein the valve main body includes:
• a body portion in which an inlet hole connected to an inlet pipe providing a flow path is formed at one side of the body portion, an exit hole is formed at the other side, and a discharge hole is formed in a direction perpendicular to a direction from the inlet hole to the exit hole;
• and
• a cap portion which blocks the exit hole;
• a shaft installed in the valve main body and configured to move forward toward an inside of the valve main body or backward toward an outside of the valve main body;
• a disk disposed in the valve main body and configured to open or close the valve main body;
• and
• a spring interposed between the disk and an inner surface of the valve main body,
• a central shaft inserted into a hollow formed in the shaft, wherein, in the central shaft:
• a fluid passage is formed at an inside;
• an outlet hole which communicates with the fluid passage is formed at one side;
• a second inlet hole which communicates with the fluid passage is formed at the other side:
• and
• the other side is fitted to the hollow such that the second inlet hole is movable to or from the hollow, and
• the disk is integrally fixed to the central shaft,
• wherein, in a case in which a fluid pressure of the fluid is applied to the disk, the disk opens the valve main body due to the fluid pressure of the fluid or blocks the valve main body due to movement of the shaft, and in a case in which the fluid pressure of the fluid is removed, the disk blocks the valve main body due to an elastic reaction force of the spring.