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Valve designed for use on cylinders for reversible ploughs, in order to achieve automatic reversal of the oil flow and thus of the motion of the hydraulic cylinder used to turn the plough. It is equipped with a double-acting check valve that provides additional safety and gives the possibility of positioning and locking the cylinder at any point. The piston rod is reversed by means of a differential pressure relief valve exactly at the plough's dead centre, developing more power and speed. This valve can also be fitted to heavy, unbalanced ploughs with cylinders having the following internal diameters: 40/50, 60/80, 80/100, 100/110 and 110/130 mm.
