Abstract: An actuating device may be used to operate an element inside a gas chamber through which coke-oven gas flows. The actuating device may include an actuating rod that can be connected to the element and may be arranged inside a raw gas manifold and guided to the outside through an opening. The actuating device may further include a cylinder/piston arrangement for creating axial actuating movements of the actuating rod. The actuating device may also include a device for sealing the actuating rod that is guided through the opening. The device for sealing the actuating rod may have a sealing sleeve that is arranged on an outer side of the raw gas manifold and is flexible in length. The device for sealing may further include a feed line for introducing a sealing medium into the interior space of the sealing sleeve. The sealing sleeve may be fixedly arranged at its one end and may enclose a gap between the actuating rod and the opening.