RESEARCH ON INFLUENCE OF THE VOLUME OF OIL IN FRONT OF THE DIRECT OPERATED PRESSURE RELIEF VALVE TO ITS TRANSIENT PERFORMANCES

Sasko Dimitrov; Denis Weiler; Simeon Petrov

Sasko Dimitrov Goce Delcev University
Denis Weiler Goce Delcev University, Faculty of Mechanical Engineering, Stip
Simeon Petrov Goce Delcev University, Faculty of Mechanical Engineering, Stip

Keywords: pressure relief valves, transient performances, overshooting, dynamic overload

Abstract

The dynamic characteristics determine variations of the inlet pressure in fornt of the valve in function of the flow through the valve in the time. In any hydraulic system, at valve inlet port there is some volume of compressible oil which influence the quality of the transient process. When switching the directional control valve in the hydraulic system with direct-operated pressure relief valves, a transient process occurs in which, depending of the amount of oil in front of the valve, it is possible for the pressure to reach values many times higher than the set value. This causes the system to be overloaded with undesirable consequences.

This paper examines experimentally and theoretically the influence of the volume of oil in front of the valve to its transient performances. It is presented that when there is low amount of oil in front of the valve, it reacts faster, but the system is significantly overloaded. When there is higher amount of oil in front of the valve, it reacts more slowly and overloads the system less above the preset value of the pressure.

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