A dual-disk check valve is disclosed. The dual-disk check valve comprises a housing having at least two inlet ports and an outlet port, at least two adapters securely affixed to both inlet ports, and a valve assembly, which is respectively disposed at each inlet port. The valve assembly at the inlet ports is configured to operate within the housing according to the fluid flow. The valve assembly comprises a disc provided with a spring, which is securely disposed against the respective two inlet ports using seat rings and washers. The disc at one inlet port is adapted for movement between an open position and a closed position, thereby preventing the fluid flow via the inlet port to the outlet port when another inlet port is opened for allowing fluid flow through it. The one inlet port is configured to automatically close when the fluid flows from another inlet port.