DEVICE FOR CONTROLLING A TRAILER-BRAKE VALVE, CONNECTABLE TO THE BRAKING SYSTEM OF A TRAILER

The device (1) for controlling a trailer-brake valve (8), for hydrostatic-driven towing vehicles which is provided with at least one variable displacement pump (P), comprises: one adjustment line (5) connectable to an adjustment device (C) for adjusting the displacement variation in the pump (P) of a towing vehicle, first piloting means (10) operatively connectable to a trailer-brake valve (8) to displace it from a home position to at least one braking position of the trailer, where the first piloting means (10) comprise at least one accumulator (12) of the work fluid, at least one fluid operated cylinder (13) inside which is housed one piston (17) on which act on opposite sides a first chamber (14) communicating with the adjustment line (5) and a second chamber (15) communicating with the accumulator (12), the piston (17) being adapted to interact with the trailer-brake valve (8) to displace it from the home position to the braking position as a result of a decrease in pressure occurring in the first chamber (14) with respect to the second chamber (15), and where one connecting channel (22) is interposed between the adjustment line (5) and the accumulator (12) and flow adjusting means (23) arranged along said connecting channel (22).