Load sensing type hydraulic system with hydraulic adjustment device

A hydraulic system comprising:

• A distributing valve comprising one or more sections connectable to respective uses;
• 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 operative fluid to said distributing valve;
• A discharge channel connected or connectable to a low-pressure tank 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 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, which is different with respect to said pressure that is characteristic of the use operative condition, to said supply apparatus,
• At least one proportional pressure reducing valve suitable to provide a reduced pressure to said proportional valve;
• the proportional valve being subjected at a first end to said load sensing 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 to be provided to the supply apparatus;
• the proportional valve being further subjected at the first end and/or at the second end to said reduced pressure provided by said proportional pressure reducing valve;
• wherein said conditioned pressure is provided to a pressure compensator of said supply apparatus, and
• wherein said proportional valve is subjected to said reduced pressure provided by said proportional pressure reducing valve only at one end, wherein the opposite end is subjected to the action of a spring urging the proportional valve with a respective equivalent pressure or subjected to a discharge pressure of the discharge channel connected to the tank, said proportional valve being subjected at said second end to the reduced pressure provided by a second proportional pressure reducing valve and to the conditioned pressure to be provided to the supply apparatus.