A foot valve is a specialized type of check valve installed at the bottom of a suction line in a pump system, typically submerged in a fluid source, such as a well or a tank. Its primary function is to allow fluid to flow into the pump while preventing backflow when the pump is turned off. This design helps maintain the pump's prime, ensuring it can start efficiently without needing to be refilled. Foot valves typically feature a strainer or screen to prevent debris from entering the pump, protecting it from damage. Common applications include water pumps, irrigation systems, and various industrial processes where consistent fluid supply is critical.

Non-return valves, also known as check valves, are devices designed to permit fluid flow in one direction while preventing backflow. These valves come in various designs, such as swing, lift, and diaphragm types, and are used in a wide range of applications, including plumbing systems, HVAC systems, and industrial processes. By allowing fluid to flow freely in the intended direction and closing off when flow attempts to reverse, non-return valves help maintain system efficiency, prevent contamination, and protect equipment from damage due to backpressure. They are essential for ensuring the reliable operation of fluid transport systems across various industries.