Abstract: A self-discharging centrifugal drum for clarifying and separating suspensions, has an axially displaceable piston valve that is bounded above by a solids space and that opens and closes expulsion openings in the drum jacket. A closure compartment that can be charged with closure fluid and that can be evacuated through a centrifugal valve in the drum jacket is disposed below the piston valve. A second fluid-controlled centrifugal valve in the drum jacket is connected through connecting channels to the closure compartment and through a connecting channel with a reservoir in the drum jacket that is always charged with closure fluid and subjected to fluid pressure when the drum is in operation. When the closure compartment is evacuated, a valve cone in the second centrifugal valve opens to establish a connection between the closure compartment and the reservoir. This permits not only sudden evacuation but also just as sudden charging of the closure compartment with closure fluid.

Abstract: A self-discharging centrifugal drum for clarifying and separating suspensions has an axially displaceable piston valve that is bounded above by a solids space and that opens and closes expulsion openings in the drum jacket. A closure compartment that can be charged with closure fluid is disposed below the piston valve and into which the closure fluid is supplied through a channel that is connected to an intermediate compartment for closure fluid. The closure compartment is evacuated to initiate discharge of the drum packing by a centrifugal valve. The valve that evacuates the closure compartment is a centrifugal valve that contains a movable valve cone, with the valve cone activated by control fluid and having a valve projection that is smaller in diameter than the valve cone and that is sealed into the drum jacket behind the valve cone so that the valve projection will extensively choke or close the channel that connects the closure compartment to the intermediate compartment when the valve cone opens.

Abstract: Safety device for centrifugal separator for preventing a disassembly when the drum is rotating. Tipping lever 25 (FIG. 1) is fastened to the offtake 19 which is for removing separated liquid. The tipping lever extends through an opening 27 in hood 2 which is stationary. By magnetic attraction of a permanent magnet 14, which is mounted on the drum, the tipping lever is pulled inwardly so that it engages the inner edge of opening 27 and thereby locks the offtake on the hood. The magnet 14 extends only partway around the drum and when the drum is stopped the offtake can be rotated so that the tipping lever is out of the reach of the magnet 14. The opening 27 is elongated to permit rotating of the offtake.

Abstract: A centrifugal separator having outlet valves 11 (FIG. 2) at the periphery of the drum for discharge of concentrate. The valve piston 20 is shielded from drum pressure by the valve casing 17 and the position of the valve piston is controlled by control fluid introduced through bore 26. The valve nozzle 18 is provided with a notch 19 for control of the valve opening size. This facilitates control of the rate of discharge of concentrate in dependence of the operating conditions.