An air valve with a DN50 (2-inch) size is a crucial component in water and wastewater pipelines. It serves to release air pockets or gases that can accumulate in the pipeline, preventing issues like air locks and water hammer. This size, DN50, corresponds to the valve's nominal diameter, making it suitable for pipelines with a 2-inch diameter. These valves typically feature a float mechanism that automatically opens to release trapped air and closes when the pipeline is filled with water. Properly functioning air valves help maintain pipeline efficiency, minimize pressure fluctuations, and prevent damage to the system. They are essential for ensuring the smooth operation and longevity of water distribution and sewage systems.