US 10,328,368 B2Granted

Flat-face valve for pulp rotary drum vacuum washer filter

AssigneeAndritz Inc.

InventorTodd Grace

Life of this patent

Estimating the term…

Loading patent…

Abstract

In a rotary drum for thickening pulp, the rotary drum may include drainage channels for delivering filtrate from a pulp mat on the rotary drum to a filtrate chamber at an end of the rotary drum, and includes a flat face valve and plenum chamber assembly in the filtrate chamber. The flat face valve can be juxtaposed against drainage outlets of the drainage channels, wherein the flat face valve does not block the drainage outlets during a majority of the rotation of the rotary drum. An opening on the flat face valve may extend through the front surface and be aligned with the drainage outlets to provide a fluid passage through the flat face valve and to a plenum chamber behind the flat face valve such that air in the filtrate is collected in the upper portion of the plenum chamber and removed from the rotary drum.

Claims9

Dependent claims

A flat face valve comprising:

a plate seat including a front surface configured to be adjacent to drainage outlets of drainage channels in a rotary drum, wherein the plate seat is configured to cover the drainage outlets during a portion of a rotation of the drainage outlets, and wherein the plate seat is configured to not cover the drainage outlets during a majority of the rotation of the drainage outlets;
an opening on the plate seat extending through the front surface, wherein the opening is configured to be aligned with the drainage outlets;
an opening on the plate seat extending through the front surface, wherein the opening is configured to be aligned with the drainage outlets;
a plenum chamber adjacent to a back surface of the plate seat, wherein the plenum chamber is a chamber formed by a box having a back wall, a sidewall extending from the perimeter of the back wall and an open front, wherein an edge of the sidewall abuts the plate seat, and wherein the opening provides a fluid passage from the drainage outlets, through the plate seat and into the plenum chamber;
and
a gas vent extending from an upper region of the plenum chamber.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/372,728Filed 8 Dec 2016 · continuation
Priority: 1 Oct 2012
Published: US 2017/0087493 A130 Mar 2017
Granted: 25 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B01D 36/001
Filter circuits or combinations of filters with other separating devices: filters in combination with devices for the removal of gas, air purge…
B01D 33/06
Filters with filtering elements which move during the filtering operation: with rotary cylindrical filtering surfaces, e.g. hollow drums
B01D 33/09
Arranged for inward flow filtration: with surface cells independently connected to pressure distributors
B01D 33/48
Regenerating the filter material in the filter: by flushing, e.g. counter-current air-bumps

Family

Application61/708,259Us provisional application · filed 1 Oct 2012
PCT/US2013/062856Parent of this continuation · filed 1 Oct 2013
US 2017/0087493 A1Pre-grant publication · published 30 Mar 2017
Application14/428,042Parent of this continuation
US 9,551,430 B2Parent of this continuation
US 2015/0292639 A1Published application
US 10,328,368 B2This patent

From the US filing history. Foreign family members aren’t listed.