The pilot-operated relief valve with piston rod control and replenishing oil function has the characteristics of fast response and large flow, making it widely used in hydraulic systems of engineering machinery. However, it often exhibits significant pressure overshoot. To uncover the key factors affecting pressure overshoot, a simulation model in AMESim software was built, focusing on a specific pilot-operated replenishing oil relief valve. The study investigated the influence of structural parameters on pressure overshoot.The simulation results show that as the cone angle of the main valve core, the orifice diameter of the pilot damping, and the inlet diameter gradually increase, the pressure overshoot of the main valve port gradually decreases. When the orifice diameter of the valve core damping gradually increases, the pressure overshoot of the main valve port gradually increases. When the cone angle of the main valve core, the orifice diameter of the valve core, the orifice diameter of the pilot, and the inlet diameter are adjusted from 25°, 4.2 mm, 4.10 mm, 13.0 mm to 40°, 4.8 mm, 4.16 mm, 13.5 mm, the pressure overshoot of the main valve port decreases from 57.1% to 19.4%. The pressure overshoot of the pilot-operated relief valve with replenishing oil function is significantly reduced after structural parameter optimization. In addition, the improved relief valve with replenishing oil function opens at a pressure of 0.13 MPa under replenishing oil conditions, and the pressure difference increases slowly with the increase of replenishing oil flow rate, showing a significant improvement in performance compared with before. The research provides theoretical guidance for the optimization of valves and has certain reference value for the relevant research of similar products.
Key words
AMESim simulation /
structural parameters optimization /
replenishing relief valve /
overshoot
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