Patent ID: 8240141

Claim:
A hydraulic system comprising at least one hydraulic circuit said hydraulic circuit comprising: at least one hydraulic pump for generating a high pressure flow of a hydraulic fluid of the at least one hydraulic circuit, said pump defining a direction upstream of the hydraulic circuit, one or more consumer equipment units of a first zone using the hydraulic fluid, said consumer equipment units defining a direction downstream of the hydraulic circuit, at least one HP discharge line in which the hydraulic fluid flows from the pump to the consumer equipment units, said HP discharge line comprising at least one bypass consumer equipment units of a second zone, in which second zone the hydraulic pump is located, said bypass being located between, on the one hand, the pump and, on the other hand, the consumer equipment units, at least one return line in which the hydraulic fluid flows from the consumer equipment units to a hydraulic tank, said return line comprising at least one bypass to consumer equipment units of a second zone, said bypass being located between, on the one hand, the tank and, on the other hand, the consumer equipment units, wherein the hydraulic system comprises: at least two fuses, on the at least one HP discharge line of the at least one hydraulic circuit between, on the one hand, the bypass and, on the other hand, the consumer equipment units, the second fuse being located downstream of the first, at least two nonreturn valves on the at least one return line of the at least one hydraulic circuit between, on the one hand, the bypass and, on the other hand, the consumer equipment units, and opposing the flow of the fluid from the pump to the consumer equipment unit, each fuse comprising an open position in which the hydraulic fluid flows freely in the HP discharge line from upstream to downstream of said fuse in a normal operating mode of the hydraulic circuit and comprising a closed position in which the hydraulic fluid is prevented from flowing from upstream to downstream of said fuse, each fuse being placed automatically in the closed position when a break of the HP discharge line is detected downstream of said fuse of said HP discharge line, and each fuse is normally open and closes, without external action, when a flow rate of fluid passing through the line at said fuse is higher than a predefined threshold flow rate, characteristic of the rating of the fuse concerned.