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About Check Valve.



What is a Check Valve?
The valve that used to prevent back flow 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, 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
#  Swing Type.
+  Top Hinged
+  Tilting disk
#  Lift Type
+  Piston Type
+  Ball type
#  Dual Plate Type
#  Stop Check Valve



Application of Check Valve (NRV):

Check valves (Non-return valve) are used in a piping system to prevent back flow. The discharge line of rotary equipment such as pump and compressor always fitted with a check valve to prevent back flow.

The only function of a Non-return valve is to prevent back flow. 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.

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