What is a Check Valve?
The valve that used to prevent backflow in a piping system is known as a check valve. It is also known as a non-return valve or NRV. The pressure of the fluid passing through a pipeline opens the valve, while any reversal of flow will close the valve.
It allows full unobstructed flow and automatically shuts as pressure decreases. The exact operation will vary depending on the mechanism of the valve.
Parts of Non-Return Valve
It is consists of body, cover, disk or Ball , hinge pin, and seat ring. In the image below you can see the parts of the valve.
Types of Valves
The type of disk will decide the type of valve. Most common types of Check valves are
. Top Hinged
. Tilting disk
. Piston Type
. Ball type
Dual Plate Type
Stop Check Valve
On all Sectors and Applications must be use Check Valves
Advantages and Diasadvantages
Can you guess why I have not mentioned any advantages or disadvantages of the check valve? The only function of a Non-return valve is to prevent backflow. There is no better alternative. Yes, you can choose the best NRV from the various available type that you have learned but you cannot supplement the Non-return valve with another valve.