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A new compact pressurization control system of the low pressure casting machine for crucible pressure casting has been developed.It is especially designed for the production of high-quality aluminum or magnesium alloy parts with low input cost.This machine with such a system has the virtue of economical and compact,and combines the Fuzzy-PID technology and achieves accuracies of ±2.5 mbar.At present,this machine has been adopted by several users in China for the production of aluminum alloy castings with high property requirements.Furthermore,for magnesium alloy castings,this machine can be used with the gas protect unit.