A hydraulic system comprising: - A distributing valve comprising one or more sections (S1, ...Sn) connectable to respective uses (U1,...Un); - A supply apparatus comprising a pump and a supply channel connected to said pump , said supply apparatus being suitable to provide a flow rate of high-pressure (P) operative fluid to said distributing valve ; - A discharge channel connected or connectable to a low-pressure tank (T) and to discharges of the uses connected to said distributing valve ; - A use signal channel coming from the section(s) of said distributing valve and receiving, from said section(s), a signal that is characteristic of the corresponding use, corresponding to a respective load sensing (LS) pressure that is characteristic of the operative condition of the same use; - A hydraulic regulating device connected or connectable to said distributing valve and/or to said supply apparatus via said supply channel , said discharge channel and said use signal channel and including: - a 2-position 3-way proportional valve supplied by the supply channel , which is connected to said discharge channel and configured so as to provide operative fluid at a conditioned pressure (LSc), which is different with respect to said pressure (LS) that is characteristic of the use operative condition, to said supply apparatus , wherein said conditioned pressure (LS C ) is provided to a pressure compensator of said supply apparatus , the proportional valve being subjected at a first end to said load sensing (LS) pressure that is characteristic of the operative condition of the use coming from said use signal channel and at a second end to the conditioned pressure (LS C ) to be provided to the supply apparatus ; characterized in that it further comprises: a first proportional pressure reducing valve suitable to provide a reduced pressure (pr1) at said first end of said proportional valve ; wherein said proportional valve is subjected at said second end to the reduced pressure (pr2) provided by a second proportional pressure reducing valve , preferably on a thrust area distinct from the thrust area (A3, A4) of the conditioned pressure LS (LSc). - A distributing valve comprising one or more sections (S1, ...Sn) connectable to respective uses (U1,...Un); - A supply apparatus comprising a pump and a supply channel connected to said pump , said supply apparatus being suitable to provide a flow rate of high-pressure (P) operative fluid to said distributing valve ; - A discharge channel connected or connectable to a low-pressure tank (T) and to discharges of the uses connected to said distributing valve ; - A use signal channel coming from the section(s) of said distributing valve and receiving, from said section(s), a signal that is characteristic of the corresponding use, corresponding to a respective load sensing (LS) pressure that is characteristic of the operative condition of the same use; - A hydraulic regulating device connected or connectable to said distributing valve and/or to said supply apparatus via said supply channel , said discharge channel and said use signal channel and including: - a 2-position 3-way proportional valve supplied by the supply channel , which is connected to said discharge channel and configured so as to provide operative fluid at a conditioned pressure (LSc), which is different with respect to said pressure (LS) that is characteristic of the use operative condition, to said supply apparatus , wherein said conditioned pressure (LS C ) is provided to a pressure compensator of said supply apparatus , a first proportional pressure reducing valve suitable to provide a reduced pressure (pr1) at said first end of said proportional valve ; wherein said proportional valve is subjected at said second end to the reduced pressure (pr2) provided by a second proportional pressure reducing valve , preferably on a thrust area distinct from the thrust area (A3, A4) of the conditioned pressure LS (LSc). <EOS>