This paper reports an experimental study of the supply pressure decay within many different hydraulic system designs. The experimental pressures are compared to a supply pressure with changing the number of valves different design. The hydraulic control system contains mainly hydraulic power unit (Oil Tank; 110 L, Pressure Filter, Pilot Operated Pressure Relief Valve, Non-Return Valve, Manometer, Return Filter, Thermostat and Heating Unit, Cooling Unit and many types of control valves). These investigations provide a study for decay of supply pressure under different operating conditions. The investigations have been carried out for different system designs. The analysis of the results introduces the effect of system designs on supply pressure. Also, the investigations provide the effect of variation of system operating conditions.
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