Actuator and method for operating an actuator

An actuator for axial displacement of an object, wherein said actuator comprises:

• an actuator piston disc,
• a cylinder volume adapted for said actuator piston disc, where said actuator piston disc divides said cylinder volume in a first portion and a second portion, where said piston disc is movably arranged in an axial direction between a rest position and an active position,
• an actuator piston rod connected to said actuator piston disc for guiding said actuator piston disc in an axial direction,
• an inlet channel arranged between a pressure fluid inlet and the first portion of the cylinder volume for transporting pressure fluid from said pressure fluid inlet to said first portion of the cylinder volume,
• a controllable first inlet valve arranged in said inlet channel,
• a controllable second inlet valve arranged downstream said controllable first inlet valve in said inlet channel,
• an outlet channel arranged between said first portion of the cylinder volume and a pressure fluid outlet, and
• a controllable outlet valve arranged in said outlet channel,
• wherein each of said controllable first inlet valve, said controllable second inlet valve and said controllable outlet valve are individually electrically controlled.