A double acting butterfly valve is a type of butterfly valve with an actuator that uses pneumatic or hydraulic pressure to open and close the valve in both directions, offering precise and reliable operation. Unlike single acting actuators that rely on a spring for return motion, double acting systems require pressure for both actions, allowing for faster response and greater control. Double acting butterfly valves are commonly used in water treatment, chemical processing, and HVAC systems due to their durability, compact design, and efficiency in high-cycle operations.