Pressure-restoring process has strict requirements in some special purpose establishments such as ground simulator for astronauts- training. A pressurized pressure-restoring system was designed for large-scale vacuum chambers with a view of analyzing the pressure-restoring process with high speed requirement. Simulation models were established with special focus on heat transfer, while incorporating segmented centralized parameter models of a long gas tube. An simulation analysis was done to the models. The calculations show that the pressurized pressure-restoring rate is much greater than that of regular pressure-restoring, the rate is strained by heat transfer, and the segmented centralized parameter models of the long gas tube deliver better accuracy than the other kinds of models but with no more calculating jobs. Compared the simulation calculations of heat transfer with the actual debugging situation in the pressure-restoring test of a large 200��m3 chamber, the error is no more than 5%, which proves the reliability of the whole simulation.
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