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Vacuum adopts negative pressure closed-loop to automatically adjust the vacuum degree, improve the quality of pipe production, reduce noise by more than 30dB, and save energy by 30 ~ 85%.

It adopts vacuum negative pressure closed-loop control, HMI sets the pressure required for pipe sizing, starts the vacuum pump to send signals to inverter through the negative pressure sensor, automatically adjusts the speed of the vacuum pump, quickly achieves the constant negative pressure without manual pressure relief, achieves the energy-saving effect and improves the production stability.