Valves for actuators with memory (V0325): designed for use on cylinders with memory for on land reversible ploughs, it incorporates a relief valves which provides protection against shock forces when the plough passes the dead head point. Valves for actuators without memory (V0326): designed for use on cylinders without memory for on land reversible ploughs, as well as the relief valve it has a pressure limiting function which reduces the maximum cylinder extension (head side) pressure in order not to damage the mechanical stops and the plough’s stucture. Both valves are provided with a fixed compensated flow control valve which allows constant speed whether the plough works in farrow or on land.