Non_return valve

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A non-return valve, also known as a check valve, is a device that permits fluid flow in one direction only while preventing backflow. This type of valve consists of a flap or door that opens when the pressure on one side of the valve increases and closes to prevent fluid from flowing in the reverse direction. Non-return valves are commonly used in plumbing systems, HVAC systems, and industrial processes to maintain proper flow and pressure control.