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The purification system of our factory is about 600m away from the rotary kiln of the cement plant. When the kiln gas is normally driving, the temperature of the pipeline can reach above 100°C. When the kiln gas is stopped, the temperature of the pipeline will decrease and shrink, and the flange 7 and the nozzle 6 will go to Move right and the pipe expander (see illustration) is elongated. If the pipe temperature rises, the pipe is heated and expanded, the nozzle 6 and the flange 7 move to the left, and the pipe expander becomes shorter. Since the purifying system has a fan, the inside of the purifying pipe is under negative pressure, and the packing 3 is not easy to leak.