Pneumatic Actuators are ideal for the operation of 90º-turn devices such as Butterfly Valves, Ball Valves, Plug Valves, Damper Valves, and other devices. POSI-FLATE Tork-Mate Pneumatic Actuators are modular, featuring easily removable end caps and modular spring packs to simplify the conversion from double-acting to spring-return configuration. Special piston seals greatly extend the life of the pneumatic actuator compared to standard O-ring Actuators. All other bearings, seals, and components have been engineered to provide superior and extended service lives.