Wherever a defined, straight movement is required in or on a plant, machine or piece of apparatus, the hydraulic compact actuators are a natural choice. This is particularly true when a dependable actuator is needed which would be too difficult or expensive to realize using mechanical or pneumatic systems. Furthermore the hydraulic compact actuators are extremly environmental efficient because energy is only needed when the cylinder is moving. Furthermore the hydraulic compact actuators are extremly environmental efficient because energy is only needed when the cylinder is moving.