Patent ID: 7631596

Claim:
A choke for a screw device, the choke comprising: a multi-piece choking plug comprising a plurality of choking plug segments, each of the choking plug segments corresponding to one of the choking plug pieces; and a multi-piece choking ring cooperating with the choking plug, the choking ring comprising a plurality of choking ring segments, each of the choking ring segments corresponding to one of the choking ring pieces, the multi-piece choking ring being selectively positionable at a plurality of different axial positions relative to the multi-piece choking plug and along a barrel of the screw device; wherein the screw device includes a worm assembly rotatable in a barrel about an axis to move material in a downstream direction in the barrel while compacting the material, the worm assembly including a shaft, the choke further comprising a hub for mounting on the shaft for rotation with the shaft, each of the choking plug segments being releasably mounted on the hub and removable from the hub without removal of the hub from the shaft.