Check valves have several other names, such as one-way, non-return, or clack valves. They have a design that is used for the guarantee of unidirectional flow. With this, they are often used as a preventive measure to avoid overflow, backflow, and other hazardous operating conditions. As such, they are found in a wide variety of fluid handling systems. A few check valve applications are irrigation systems, oil and gas extraction and processing equipment, potable water systems, standard and critical power generation and distribution equipment, subsea operation systems, wastewater treatment facilities, and more.