Hydraulic actuator for a servomotor with an end lock function

A hydraulic actuator for a hydraulic servomotor having a first chamber and a second chamber, the actuator being connected to a fluid source and a fluid drain, the actuator comprising:

• a first valve fluidly connected between the fluid source and the first chamber, said first valve being of a kind which, in a de-energized state, allows a fluid flow between the fluid source and the first chamber, at least in a direction from the fluid source towards the first chamber,
• a second valve fluidly connected between the first chamber and the fluid drain, said second valve being of a kind which, in a de-energized state, prevents a fluid flow between the first chamber and the fluid drain,
• a third valve fluidly connected between the fluid source and the second chamber, said third valve being of a kind which, in a de-energized state, prevents a fluid flow between the second chamber and the fluid source, at least in a direction from the second chamber towards the fluid source, and
• a flow channel arranged in fluid communication with the second chamber, said flow channel being arranged in such a manner that a fluid flow is allowed in a direction out of the second chamber via the flow channel.