The valve BVMS12 is a regulating valve of pressure with automatic unloading flow that to be use direct in line with oleodinamic accumulator. At setting pressure value (P2, adjustable), this valve discharge the flow of oleodinamic pump untill, in the circuit, the value of minimum pressure (P1, not adjustable, fixed value) will be less than 15% of setting pressure value (P2). We underline also that the precharge pressure of the accumulator (P0) must be ever 10% less than minimum pressure (P1). We highlight also that this valve have not any electric parts, for this reason in not necessary any supply voltage