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When the hydraulic press is working, a direct acting relief valve is added at the pump outlet to prevent the machine from being stuck by debris or workpieces. This is because the output pressure oil increases with the working time of the pump, and the hydraulic oil cannot reach the hydraulic cylinder, which protects the safety of the hydraulic pump and hydraulic components. It acts as a safety valve. When the pump pressure reaches the conduction pressure of the relief valve, the relief valve opens and the hydraulic oil flows back to the oil tank, which can protect safety. In hydraulic systems, the relief valve is placed near the hydraulic pump to increase the stability of the hydraulic system and improve the machining accuracy of parts.