CHECK VALVE is a type of one-way valve designed to allow fluid to flow in one direction while preventing backflow. It features a disc or ball mechanism that opens when fluid flows in the intended direction and closes when the flow reverses. Typically made from materials like stainless steel, brass, or plastic, check valves are essential in various applications, including water supply, wastewater treatment, and industrial processes. They help protect equipment and maintain system integrity by ensuring that fluid flows only in the desired direction.