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Due to the large variation in output power of the plate heat exchanger hydraulic press system, different processes require different flow and pressure requirements. Therefore, it is necessary to rely on flow valves and pressure valves to adjust the required flow and pressure. However, the quantitative pump does not have a regulating function, which wastes energy when the oil temperature rises. At the same time, it also increases the wear and tear of various valves, high oil temperature, and loud noise, which will shorten the overall service time of the 400 ton four column plate heat exchanger hydraulic press.