Patent ID: 8377261

Claim:
A high pressure sluice feeder for transferring a chip slurry from a low pressure level to a high pressure level, comprising: a conical rotor having a first through-going pocket and a second through-going pocket defined therein, the conical rotor being rotatable about a given axis (CC) of rotation and the first and second through-going pockets having opposite end-openings functioning as both inlets and outlets depending upon a rotational position of the conical rotor, the first through-going pocket being offset from the second through-going pocket in the rotational position of the conical rotor; a housing enclosing the conical rotor, the housing having an exterior periphery and at least a first set of first, second, third and fourth ports defined therein disposed around the exterior periphery thereof for registry with the inlets to and outlets from each first and second through-going pocket; the first port being opposite the third port, the second port (F 2 1 ) being opposite the fourth port (P 4 1 ), the housing having an interior conical surface congruent with an outer conical surface of the conical rotor; means for mounting the conical rotor in the housing, means for rotating the conical rotor with respect to the first, second, third and fourth ports about the given axis (CC) of rotation, and in a first direction, the outer conical surface being held at a predetermined play in relation to the interior conical surface of the housing in order to minimize leakage of pressure from pockets held at high pressure to pockets held at low pressure; the outer conical surface or the housing having a groove defined therein, the groove being oriented in a general direction (DG) having at least one component (C 1 ) running in parallel with a generatrix of the interior conical surface of the housing or the outer conical surface of the rotor, the groove connecting one of the first, second, third or fourth pocket with a fluid pressure source, and the fluid pressure source having means for establishing a flushing action trough the groove in a direction having one component in parallel with the generatrix of the interior conical surface.