The ASME B16.5 Check Valve is a valve type defined by the ASME B16.5 standard, widely used in the manufacturing of cast and forged steel pipe flange and flanged fittings. It serves as a one-way valve, allowing fluid flow in only one direction to prevent backflow, which can lead to contamination issues in the system. These valves offer an affordable, efficient, and straightforward solution to prevent potential problems caused by backflow.