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Function:

Non-return Check Valve or one-way Check Valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in one direction only.

Operation:

• The main mission of a Check Valve is to avoid back pressure in      the process (avoid that the flow is switching direction)

• A Check Valve can also be used for isolation purpose.

• There will normally be regulations telling how many and in      which location Check Valves are to be installed in the process.

Design:

• As for most valves there are a lot of different designs of      Check Valves. The basic design is a Duo Check Valve with two discs mounted      on an hinge pin in the center of the Check Valve. The Check Valve has a      standby closed position with springs pushing the discs towards the seats.      These valves are designed for installation on a horizontal line where the      hinge pin is placed in a vertical position.

• To reduce space and weight these Check Valves are often      delivered as wafer valves.

Other types of Check Valves:

• Swinging Check Valve 

• Tilting Disc Check Valve

• Piston Check Valve

• Non slam Check Valve

• Needle Check Valve

• Nozzle Check Valve