Valvesonly is the most prominent Pneumatic actuated butterfly valve manufacturer in USA. Pneumatic Actuated Butterfly valves are quarter-turn rotational valves that are used to avoid, control, or start flow. Pneumatic Actuated Butterfly valves are especially well suited to the handling of large volumes of fluids or gases at low pressures, as well as slurries or fluids containing large amounts of suspended solids. A pneumatically operated butterfly valve is a mechanism that transforms energy in the form of compressed gas into mechanical motion.