Abstract: The present invention relates to an actuator (2) for controlling and observing functions of a machine, comprising two or more hand-operated control members (3-8), functional display elements connected to each control member. Each of said hand-operated control members (3-8) are arranged to control one or more functions included in different functional groups (16-20). Said functional display elements comprising one or more electro-optical displays (12, 13) divided into one or more display sections (24-29), whereby each display section is connected to a certain control member and has a specific logical positions in relation to this control member, and is arranged to show the function that is controlled by this controlled by this control member (3-8) and also to show information about the status of functions of the machine. The present invention also relates to a computer program product to am actuator according to the present invention.

Abstract: An electro dynamic set device including an output set element, a piston having a piston rod and operable against the action of a force of hydraulic pressure and means defining a valve passage which communicates with an operating side of the piston to which hydraulic pressure is supplied. The passage is opened and closed by a control slide which operates by an electromagnet that can apply a magnetic force. A spring acts between the control slide and the piston such that the spring tends to move the control slide against the action of the magnetic force in a direction closing the passage. The control slide is annular and concentric around the piston rod and is located together with a coil of the electromagnet and an associated armature thereof in a common chamber. The coil encircles the piston rod as does the slide. The operating side of the piston is in the common chamber, the armature being suspended by another spring which permits movement of the armature in the length direction of the control slide.