A check valve, also known as a non-return, reflux, retention, foot or one-way valve, is designed to allow liquids or gases to flow through a pipeline in only one direction. The valve operates automatically, opening when fluid flows in the correct direction and closing when the flow stops or reverses. This helps prevent backflow, protect pumps and other equipment, maintain system pressure and improve overall process reliability. Check valves are widely used across mining, water treatment, chemical processing, power generation, oil and gas, and general industrial applications.