Abstract: A check valve is provided between an inflow pipe and a discharge pipe through which fluid is transferred. The check valve includes a body part having an inflow region connected to the inflow pipe so that the fluid flows therein, a retention region in which the fluid supplied therein through the inflow region remains, and a discharge region connected to the discharge pipe so that the fluid of the retention region is discharged to the outside therethrough; and an opening/closing part, which is provided inside the body part so as to have a disc assembly for opening/closing the path of the fluid flowing in through the inflow pipe, a stem for providing the movement path of the disc assembly, and a first guide for supporting one side of the stem.

Abstract: A valve assembly is disclosed. The valve assembly is installed between an inlet pipe and an outlet pipe through which a fluid is transferred, the valve assembly including: a valve body in which an inlet portion which is connected to the inlet pipe and through which the fluid is introduced, a space portion in which the fluid supplied to an inside of the valve body through the inlet portion stays, and an outlet portion which is connected to the outlet pipe and through which the fluid of the space portion is discharged to the outside are formed; and an opening and closing unit configured to open or close a path of the fluid by moving in a state of being in close contact with an inner surface of the valve body, wherein the valve body is formed of a pipe of a steel or stainless-steel material.

Abstract: A check valve having a reverse-direction fluid supply function capable of supplying a fluid in a reverse direction by opening a fluid passage formed in a central shaft of a disk configured to open or close a flow path. The valve includes a valve main body into which a fluid is introduced, 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. The disk opens the valve main body due to fluid pressure and blocks the same when fluid pressure is removed by movement of the shaft or by an elastic reaction force of the spring.