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Abstract

Overflow loss through the relief valves is universal in hydraulic systems. To explore the feasibility to regenerate the overflow loss, an energy regeneration unit is connected to the outlet of the proportional pilot relief valve which can reduce the pressure difference and the overflow loss accordingly. The added energy regeneration unit may affect the performance of the proportional pilot relief valve. The mathematical model of the proportional pilot relief valve with the energy regeneration unit is established. And AMESim is employed to develop the simulation model of the proportional pilot relief valve to obtain the characteristics of the proportional pilot relief valve which is affected by the energy regeneration unit. The experiment is carried out to test the influence of the energy regeneration unit on the performance of the proportional pilot relief valve. The experimental results show that the inlet pressure of the proportional pilot relief valve decreases gradually with the increase in back pressure of the energy regeneration unit. The maximum pressure drop of the inlet pressure of the proportional pilot relief valve is about 0.63 MPa. Compared to the fluctuation caused by the flow rate, which is 10%–30%, the fluctuation caused by the energy regeneration unit is only 2.8% and can be neglected. This indicates that the feasibility and effectiveness to regenerate the overflow loss of the proportional pilot relief valve through connecting an energy regeneration unit to the outlet of the proportional pilot relief valve.

Keywords

Relief valve inlet pressure static characteristics back pressure energy regeneration unit

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Influence of the energy regeneration unit on pressure characteristics for a proportional relief valve

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