Calibrating device for a hydraulic safety apparatus, especially for ploughs

摘要

Device making it possible to determine at will the working hydraulic pressure of a closed hydraulic assembly 1, this pressure always falling into a range lying between minimum and maximum values. This device comprises two controlled overpressure valves: a first valve 9 which is driven by the high pressure coming from the pressure source 23 and a second valve 18 which is driven by the pressure existing in the closed circuit 1; in such a way that the first valve 9 determines the maximum value of the pressure and the second 18 the minimum value. <IMAGE>