Actuator devices 300 useable to change orientation of one or more vanes, and related methods separating a first fluid at one end of an actuator 310 rod and a second fluid at an opposite end of the actuator rod are provided. An actuator device includes the actuator rod and an actuator device body 320 configured to allow the actuator rod to move along the axis inside the actuator device body, and having an inlet flange 322 configured to allow a third fluid to enter a space between the actuator device body 320 and the actuator rod 310, and an outlet flange 324 configured to allow the third fluid to exit the actuator device body. Besides providing a fluid seal between the first fluid and the second fluid, the third fluid may also heat the actuator rod thereby preventing ice formation.