A check valve (also known as a non-return valve or one-way valve) is an automatic, self-actuated valve designed exclusively to control fluid flow in a single direction, effectively preventing the reverse flow of media—whether liquid, gas, or steam. Its operation relies on the pressure of the flowing fluid itself: when the fluid pressure in the desired direction exceeds a specific threshold, the valve opens to allow unobstructed flow; when pressure reverses, the valve closes tightly, blocking backflow without the need for external power or manual operation.
By ensuring unidirectional fluid movement, the check valve not only guarantees stable equipment operation but also significantly enhances the overall safety, efficiency, and lifespan of fluid handling systems.It is mainly used in air compressors, water pumps, and hydraulic systems.
