We offer gravity strainer

Gravity Strainers model BSW.

Filterteknik´s BSW Gravity Strainer is available in six sizes, and are self cleaning systems that work under atmospheric conditions, removing suspended solids from relatively high flow water streams up to 11000 l/min. They are most commonly used in the pulp and paper industries to reduce the fibre concentration and to remove felt hairs and fibre bundles. Also to separate long fibres and process debris from recycled plant waters.

BSW Gravity Strainers used on white water in papermaking are mostly used on water streams with 20 up to about 600 mg/l (ppm) fibres.

Typical applications are the mills spray water supply, purification of sealing water from vacuum pumps, polishing of water from flocculation plants and cooling towers and treating intake water from rivers.

How they work.

The water is fed in tangentially between the outer and inner jackets of the filter vessel. The water flows up and over the edge of the internal vessel and down onto the strainer media. Unwanted solids/fibres are captured upon the strainer media, and clean water passes through the fine filter mesh, exiting at the bottom of the strainer vessel. Cleaning is achieved by spray cleaning the strainer media in a novel way, ‘bottom-up cleaning’. Two spray bars positioned underneath the strainer media, rotate in unison, and in-line with the unique collection chambers located directly above the strainer media. These collection chambers catch the fibres/solids lifted by spray water from the screen surface, and feed them down towards the drain.

The ‘bottom-up’ advantage:

Our BSW Gravity Strainers represent a superior alternative to previous designs prevailing in the market. The bottom-up cleaning technique used, is a major improvement over other designs that rely on “top-down” sprays to drive solids/fibres along and across the strainer media to a collection point. This top-down technique is less effective and less efficient in retaining fibres/solids, because the sprays agitate them into or through the strainer media. The bottom-up spray continuously forces fibres/solids off the strainer media and lifts them to the reject pipe. This makes the BSW Gravity Strainer more effective and efficient in retaining fibres/solids, and provides an improved final filtrate.