VERFAHREN UND VORRICHTUNG ZUM ENTWAESSERN VON SUSPENSIONEN

摘要

A method and apparatus for dewatering a suspension of comminuted fiber material and liquid. A suspension is passed in a given direction in a container of generally circular cross-section having a hydraulic piston mounted generally concentrically therein. There are no movable components extending between the piston and the walls of the container in which it is disposed, therefore leakage from the container is minimized. The piston has screens for separating liquid from the suspension associated therewith, and is movable in the same direction as the suspension flow during removal of some liquid from the suspension, and is movable in a direction opposite to the direction of fluid flow to facilitate cleaning of the screens and to return the piston to a position wherein it can move in the direction of flow again. Liquid from the suspension is utilized for effecting the movement of the piston in both directions, and preferably the piston moves more quickly in the direction opposite to the direction of the flow of the suspension than in the direction of the flow of the suspension. Backflushing of the screens also is provided.