Additional hytork xl features all the hytork xl features provide. All xl actuators feature the new star pinion drive, providing greater flexibility for direct or bracket mounting to an increased range of valve designs, including valves that have an iso 5211 design with the stem turned at 45 degrees. The hytork xl rack and pinion pneumatic actuators combine reliability, quality pneumatic valve actuation in a compact, costeffective solution the robust heavy duty body design combines a high strength aluminium casting which protects the actuator from any dents, knocks or extreme usage that may be seen in certain process industry environments. A simple end cap assembly exchange provides an efficient, compact. Hytork xl actuator pinion drives are manufactured to iso 5211 with a star drive to provide extra flexibility and simplicity for direct mounting to a valve. The hytork xl series pneumatic actuators are a group ii category 2 equipment and. Its rugged heavy duty body is made from a high strength lm25 aluminium casting designed to prevent damage from dents, shock or fatigue. Hytork s unique online test module for esd valves can be added to all xl spring return actuators. The actuators have numerous features that add reliability. A hytork actuator is modular in design and is field convertible from doubleacting to springreturn configurations and vice versa. The actuator complies with european safety and health requirements as required by the atex, ped and machine directives.