Special features Suitable for final control elements with rotary closure members, particularly for butterfly valves and louvers (shutters) Consisting of a yoke with mounted rotary lever and a Type 3271 Pneumatic Actuator Low overall height High thrusts Fast stroking speed Various bench ranges by varying the number of springs (3 to 12) or their compression No special tools required to change the bench range or reverse the direction of action Maintenance-free joints with plain bearings free of non-ferrous metal Accessories Accessories Options Handwheel on the outer diaphragm case