A pulp diluting apparatus has a cylindrical vessel having the top portion thereof covered with a lid having a pulp inlet, a bearing mounted on the center of the lid, a lower steady support bearing mounted on the center of a bottom end portion of the cylindrical vessel, a rotary shaft held between the top bearing and the lower steady support bearing and provided on the lower portion thereof with rods having scraper plates, a water supply pipe disposed on the bottom end portion of the cylindrical vessel for supplying water into the cylindrical vessel, a valve provided on the water supply pipe for controlling the amount of water to be supplied into the water supply pipe, a driving machine connected to the rotary shaft for rotating the rotary shaft, a torque detector for detecting the torque of the driving machine and controlling the valve of the water supply pipe, and an outlet provided in the lower portion of the cylindrical vessel for taking the diluted pulp out of the cylindrical vessel.
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