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https://www.ohis.be/wp-content/uploads/2023/01/yale-vpr.jpg6316220 - 700 bar Pressure relief valves are used it the system pressure (force of the connected hydraulic cylinder) should not exceed a certain value. These precision valves can be easily adjusted and are characterized by precise repetition. The question of a pressure relief valve only depends on the displacement of the high pressure stage of the power pack. After achieving the set pressure value, the excessive oil is guided back to the reservoir (pressureless.