Patent ID: 7491296

Claim:
A screening apparatus for screening pulp suspensions, comprising: a housing, a tubular screen basket dividing the interior of the housing into a central chamber and a single outer substantially annular chamber, the screen basket including at least two separate tubular screen sections, an inlet member for supplying a suspension to be screened into one of the central chamber and outer chamber, an accept outlet member for discharging a developed accept fraction of the suspension that has passed through the screen basket into said single outer substantially annular chamber, a reject outlet member for discharging a developed reject fraction of the suspension, a rotor arranged in the housing for providing pressure and suction pulses in the suspension to be screened along the screen basket, and dilution means for supplying diluting liquid to one of the central chamber or outer chamber, the dilution means including at least one annular element axially interconnecting the two tubular screen sections and forming a tubular dilution liquid compartment extending at least substantially around the screen basket, the annular element forming a plurality of dilution liquid ejection passages between the dilution liquid compartment and one of the central chamber and outer chamber.