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In order to provide theory basis for the selection of key parameters of the pressure-relief valve group within design and debugging, simulation model of pressure-relief and unloading process was built by using software AMESim according to the structure and working principle of three stage cartridge valve type pressure-relief valve group. Then influence of its key parameters (such as the cartridge valve orifice, throttle orifice and solenoid valve reversing time) on vibration and shock in pressure-relief and unloading processes of high pressure cavity of hydraulic press was analyzed. The results show that, with the reversing interval between slow pressure-relief and fast-unloading solenoid valves being 1 s and diameters of three primary orifices A, B and D being respectively 1.2, 0.8 and 2.0 mm, the pressure and flow fluctuations in oil-return pipe are well eased, pressure and flow in the hydraulic system change gently, and the vibration of cartridge valve group reduces as well in the condition of quick pressure-relief.
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