Pressure relief valves are used to protect hydraulic systems from overload. Although they are seat type of valves, they have internal leakage when system pressure approaches the opening set pressure. This thesis presents the results of measurements and theoretical calculations for the leakage of the relief valve. The three selected valves on which the leakage test was performed are described. The measurements were performed for three different pressures (50 bar, 150 bar and 250 bar). The leakage test was also carried out with a dynamic pulse frequency of 1 Hz.
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