Abstract: A valve, preferably of the flow control construction type, has a valve piston or pressure regulator piston mounted in an axially displaceable manner in a valve housing. The valve piston and the valve housing form a damping chamber for the motional damping of the valve piston.

Abstract: This invention relates to a process for obtaining metal values, typically base metals, platinum or gold from a feed material. In a first step of the process of the invention, feed material containing metal values is ground to a particle size d90 of 100 microns or less to form an ultra fine pulp. In a second step of the process of the invention, the ultra fine ground pulp from the first step is oxygenated by pumping it in multiple passes through an in-line high shear static oxygenation device (30), while re-circulating it on a tank (28) or any other vessel. The process of the invention results in a significant reduction in the required leach time, improved recoveries, reduced cyanide consumptions, a steadier gold tail, as well as reduced capital and operational expenditure.

Abstract: An aeration cartridge (10) within an outer vessel, the aeration cartridge (10) comprising a tube (18) constructed from two or more longitudinally joined cylindrical sections (20), wherein respective ends of the cylindrical sections (20) are shaped so that when they are joined together, at least one slot (24) passing from an inner surface of the tube (18) to an outer surface of the tube (18) is created at the join, and wherein the outer vessel is capable of being connected to a high pressure gas supply.

Abstract: A directional or flow control valve has an inlet connection, an outlet connection, and a slide that controls a fluid connection between the inlet connection and the outlet connection and is configured to control the fluid connection in at least two adjustable opening cross-sections that are spaced axially apart from each other and allow a partial flow to pass through.

Abstract: A valve, preferably of the flow control construction type, has a valve piston or pressure regulator piston mounted in an axially displaceable manner in a valve housing. The valve piston and the valve housing form a damping chamber for the motional damping of the valve piston.

Abstract: An aeration cartridge (10) within an outer vessel, the aeration cartridge (10) comprising a tube (18) constructed from two or more longitudinally joined cylindrical sections (20), wherein respective ends of the cylindrical sections (20) are shaped so that when they are joined together, at least one slot (24) passing from an inner surface of the tube (18) to an outer surface of the tube (18) is created at the join, and wherein the outer vessel is capable of being connected to a high pressure gas supply.

Abstract: This invention relates to a process for obtaining metal values, typically base metals, platinum or gold from a feed material. In a first step of the process of the invention, feed material containing metal values is ground to a particle size d90 of 100 microns or less to form an ultra fine pulp. In a second step of the process of the invention, the ultra fine ground pulp from the first step is oxygenated by pumping it in multiple passes through an in-line high shear static oxygenation device (30), while re-circulating it on a tank (28) or any other vessel. The process of the invention results in a significant reduction in the required leach time, improved recoveries, reduced cyanide consumptions, a steadier gold tail, as well as reduced capital and operational expenditure.

Abstract: A valve system has a valve housing, in which at least one valve element is displaceably guided. At least one magnetic field sensor is provided to detect the position of the valve element, which is acted upon by the magnetic field of at least one permanent magnet located on the movable valve element. The permanent magnet is guided relative to the magnetic field sensor such that it is non-rotatable but axially displaceable in the valve housing.

Abstract: A valve selected from the group consisting of a directional valve and a flow control valve has an inlet connection, an outlet connection, a slide that controls a fluid connection between the inlet connection and the outlet connection, the slide being configured so that it controls the fluid connection in at least two adjustable opening cross-sections that are spaced axially apart from each other and allow a partial flow to pass through.

Abstract: A separating device (10) especially for use in a pneumatic flotation system comprises an annular channel (18), at least one nozzle (16) for introducing aerated pulp substantially horizontally and tangentially into the annular channel (18), froth extraction means (26) for the removal of separated froth from the annular channel (18), and pulp extraction means (24) for the removal of separated pulp from the annular channel (18), the at least one nozzle (16) being configured so that the aerated pulp introduced into the annular channel (18) rotates therein with centrifugal forces of between 5 and 20 ms?2.

Abstract: Disclosed is a directional control valve comprising a front-side connector and at least one radial connector, wherein the front faces of a valve body (valve shift or seat body) of the directional control valve are pressurized approximately equally, so that the actuating forces for shifting the valve body are minimal. In accordance with the invention, the pressure for pressurizing a rearward front face of the valve body is tapped at an axial distance to the valve body.

Abstract: A separating device (10) especially for use in a pneumatic flotation system comprises an annular channel (18), at least one nozzle (16) for introducing aerated pulp substantially horizontally and tangentially into the annular channel (18), froth extraction means (26) for the removal of separated froth from the annular channel (18), and pulp extraction means (24) for the removal of separated pulp from the annular channel (18), the at least one nozzle (16) being configured so that the aerated pulp introduced into the annular channel (18) rotates therein with centrifugal forces of between 5 and 20 ms−2.

Abstract: Disclosed is a directional control valve comprising a front-side connector and at least one radial connector, wherein the front faces of a valve body (valve shift or seat body) of the directional control valve are pressurized approximately equally, so that the actuating forces for shifting the valve body are minimal. In accordance with the invention, the pressure for pressurizing a rearward front face of the valve body is tapped at an axial distance to the valve body.

Abstract: An electromagnetically actuated directional valve wherein the armature chambers are in communication with the source of working fluid via an inlet throttle and with the tank connection via an outlet throttle.

Abstract: A lifting magnet arrangement. The arrangement has a thrust direction in which a pressure spring which biases the armature into its basic position may be set. This is done by an actuating section designed to project from the magnet housing. By using this configuration it is not necessary to open the magnet housing for adjustment so that the adjusting process may be carried out with an oil-floated armature.

Abstract: A two-way control valve includes a valve member with a longitudinal bore connecting its opposite ends with each other. A housing receives the movable valve member and has two attachment ports. A control piston is operatively coupled with the valve member. To provide a two-way valve permitting pressure medium to flow in both directions when the valve member is moved from its closed position, the control piston is tightly or fixedly connected with the valve member and is arranged as an annular collar on the periphery of the valve member. The longitudinal bore is free of constrictions.

Abstract: A proportional solenoid operated pressure regulating valve is disclosed. First and second metering spools are respectively mounted for movement inside first and second control spools. Each metering spool responds to a fluid pressure being controlled at a respective operating port.

Abstract: A first front face of a main control spool of a main control valve is loaded with a constant pressure, whereas the opposite face is loaded with a controlled pressure to control the fluid passages to and from a hydraulic actuator. The control pressure is adjusted by means of a two-edge control of the pilot control spool of a pilot control valve which is actuated by a single proportional solenoid against the force of a spring. The advantages obtained thereby result in a substantial savings in manufacturing expenditure and a substantially improved control operation.

Abstract: A method and apparatus for measuring the height of the density layer in a material bed layered according to densities, such as in a jigging machine operation, utilizes a free-floating measuring body having a transmitter means embedded therein and a probe mechanism for monitoring the relative position of the body in the material bed. The measuring body is made of a material having a density equal to the relative densities of materials forming the separating line between two density levels and is able to move with the materials during the grading process. The probe mechanism is housed in a guide tube which extends in the direction of the density gradient through the material bed.