Actuator for axial displacement of an object, the actuator comprises: - an actuator piston disc and an actuator piston rod rigidly connected to and axially extending from the actuator piston disc, and together with the actuator piston disc form an actuator piston, - a cylinder volume, wherein the actuator piston disc separates said cylinder volume in a first portion and a second portion and is in axial direction displaceable back and forth in said cylinder volume between an inactive position and an active position, - an inlet channel extending between a pressure fluid inlet and the first portion of the cylinder volume, - a first inlet valve body and a second inlet valve body (9, 9', 9") arranged in said inlet channel, - an outlet channel extending between the first portion of the cylinder volume and a pressure fluid outlet, - an outlet valve body arranged in said outlet channel, wherein the inlet channel is kept closed by the second inlet valve body (9, 9', 9'') when the actuator piston disc is located at least a predetermined distance from its inactive position, and the second inlet valve body (9, 9', 9") is kept in open position when the actuator piston disc is located in the inactive position, wherein the actuator comprises an electrically controlled pilot valve, characterized in that the electrically controlled pilot valve is configured to communicate a first control pressure to the first inlet valve body via a first control pressure channel and configured to communicate a second control pressure to the outlet valve body via a second control pressure channel, wherein the pilot valve is configured to place itself in a resting state, in which the first control pressure channel is in fluid communication with a control fluid inlet of the pilot valve and the second control pressure channel is in fluid communication with a control fluid outlet of the pilot valve wherein the first control pressure is higher than the second control pressure, and in an active state, in which the first control pressure channel is in fluid communication with the control fluid outlet and the second control pressure channel is in fluid communication with the control fluid inlet wherein the second control pressure is higher than the first control pressure. - an actuator piston disc and an actuator piston rod rigidly connected to and axially extending from the actuator piston disc, and together with the actuator piston disc form an actuator piston, - a cylinder volume, wherein the actuator piston disc separates said cylinder volume in a first portion and a second portion and is in axial direction displaceable back and forth in said cylinder volume between an inactive position and an active position, - an inlet channel extending between a pressure fluid inlet and the first portion of the cylinder volume, - a first inlet valve body and a second inlet valve body (9, 9', 9") arranged in said inlet channel, - an outlet channel extending between the first portion of the cylinder volume and a pressure fluid outlet, - an outlet valve body arranged in said outlet channel, wherein the inlet channel is kept closed by the second inlet valve body (9, 9', 9'') when the actuator piston disc is located at least a predetermined distance from its inactive position, and the second inlet valve body (9, 9', 9") is kept in open position when the actuator piston disc is located in the inactive position, wherein the actuator comprises an electrically controlled pilot valve,