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The specific gravity of PVA is ranging from 1.26 to 1.31,which is heavier than that of water.Low agitation speed
or unfavorable agitating condition sometimes causes coarse particles to precipitate and to block the outlet of
the dissolving tank.Hence,a flush valve or tank valve is recommended to be installed in the bottom of the ves-
sel to prevent the particles from blocking the discharge line.
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