Abstract: A pressure-tight solid jacket or bowl screw-type centrifuge arrangement which includes a centrifuge bowl and a screw rotatably arranged in the centrifuge bowl. Drive equipment is provided for driving the centrifuge bowl and the screw with a housing being provided for accommodating and enclosing the centrifuge bowl and the drive equipment in a pressure-tight manner.

Abstract: A process and apparatus for continuous treatment of suspensions which include solid matter difficult to decant such as solid matter tending to plasticize under temperature and/or pressure loads, solid matter having a rheopexy behavior, and solid matter having at least one of high water absorption and low specific gravity differences with respect to the liquid of the suspension. The apparatus includes a solid-shell screw-conveyor centrifuge system having a rotatable screw and rotatable shell with one of the screw and shell being driven by a drive mechanism and the other of the shell and screw being joined by a hydraulic motor. A control system is provided for controlling at least one of the differential speed between the screw and shell and the speed of the shell in dependence upon the nature of the suspension being processed.

Abstract: A solid shell screw conveyor centrifuge which includes a screw rotating at a differential speed with respect to the shell. One of the shell and screw is connected to a first hydraulic motor as a main drive assembly and to the other of the shell and screw by way of a second hydraulic motor having pressure medium supplied thereto by way of a rotary transmission. The first hydraulic motor functions as a drive assembly for the shell and also is operable as a pump with a discharge from the pump being controlled by way of a valve arrangement. The valve arrangement is disposed in a conduit connecting the hydraulic motor with a pressure medium conduit supplying pressure medium to the rotary transmission of the second hydraulic motor.

Abstract: A screw conveyor centrifuge of the type having a hollow cylindrical and/or conical shaped bowl or shell and a conveyor screw extending through the bowl. The bowl and the screw are both rotatable, but at different rotative velocities. A solid-liquid mixture is fed into one end of the conveyor and the solid portion thereof is transferred away from the opposite end after being separated out of the liquid as it is conveyed along the centrifugally rotating bowl by the screw. The liquid portion of the mixture is conducted away from a receiving point intermediate the ends of the conveyor by way of fluid drain structure disposed immediately adjacent the outside surface of the hub of the screw means. In several embodiments, the fluid drain structure consists of pipes extending axially from the receiving point through holes in portions of the flights of the screw to a drain chamber disposed immediately adjacent the beginning end of the conveyor screw.