Check valve

A Check valve is also called non-return valve, that allows fluid to flow through it in only one direction. There are various types of check valves used in a wide variety of applications. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem.

Check valves are used in many fluid systems such as those in chemical, and power plants, and in many other industrial processes.