VALVE DISC, VALVE DEVICE, TANK AND METHOD FOR UTILIZING THEM

摘要

PROBLEM TO BE SOLVED: To provide a valve disc or the like capable of performing both of the discharge only of a liquid component and the discharge of a solid component (or slurry) without leaving the liquid or solid component in a tank, for the purpose of solving such a problem that residual matter is generated in a conventional washing solid-liquid separation tank in either one of a case discharging only the liquid component and a case discharging the slurry. SOLUTION: The valve disc 50 opens and closes the discharge port 52a provided to a tank 60 housing a mixture of the solid and liquid components. The valve disc 50 has a filter part (mesh unit 51) passing the liquid component but not passing the solid component. An auxiliary valve 53, capable of changing over a case passing both of the solid and liquid components and a case not passing both of them, is provided on the downstream side of the valve disc.