Abstract:
A pressured sealed rotary feeder with an inlet and outlet and a rotor mounted within a housing with a material passage therethrough. The rotor has a plurality of radially extending vanes which define material transporting compartments therebetween. Sealing means are mounted in each of the vanes of the rotor and include a movable blade which extends transversely of the vane and has a surface in contact with the interior of the passage. The surface is maintained in contact with the interior of the passage by fluid under pressure which is introduced through a passageway within the rotor and the vanes. The surface in contact with the passage is preferably of a heat resistant, self-lubricating plastic such as polytetrafluoroethylene.