A pneumatic accumulator is a device used to store compressed air for later use. It helps maintain pressure in a pneumatic system, ensuring a steady supply of air when needed. This is particularly useful in applications where air demand fluctuates, allowing for efficient operation and reducing the need for constant compressor activity. The accumulator works by using a flexible diaphragm or piston to separate the compressed air from a fluid, usually oil or water. When air pressure drops, the stored air can be released to help maintain system pressure, improving performance and reliability in various industrial and manufacturing processes.