Valmet Ab

Peter Nykvist

Jonas Magnusson

Patrik Pettersson

Hans Lövgren

Jonas Orgård

Tobias Lööf

Anders Löfstrand

Åke Sundström

Jörgen Lundberg

Per Wallin

A pulp-filter arrangement () comprises a rotatable drum () and a non-rotating valve arrangement (). The rotatable drum () has a cylindrical water-permeable pulp-supporting shell (), a plurality of drain pipes () and a rotating hollow shaft (). The plurality of drainpipes () connects the rotating hollow shaft () with a collecting channel () situated radially directly inside the cylindrical water-permeable pulp-supporting shell (). The non-rotating valve arrangement () is disposed within the rotating hollow shaft () for sealing off the rotating hollow shaft () from a radially inner outlet () of the drain pipes () when respective radially inner outlet () is situated within a sealed zone. The non-rotating valve arrangement () is further arranged to, in a transition zone immediately following the sealed zone, open a throttled passage between the rotating hollow shaft () and the radially inner outlet ().

Rotary drum vacuum filter with a throttling valve

Apparatus for washing and/or dewatering cellulose pulp is disclosed including a movable permeable surface in a pulp transportation chamber having a chamber gap above the movable permeable surface, a pulp distributor for distributing pulp onto the movable permeable surface, a throttle having a throttle gap width and an adjustable throttle adjuster to remotely adjust the throttle gap width so that a volume of pulp flow into the pulp distributor is equal to or greater than the volume of pulp flow out of the distributor during operation.

Apparatus for washing and/or dewatering of cellulose pulp

Growing community of inventors

Timrå, Sweden

Peter Nykvist