Abstract: This disclosure relates to a pump system for handling a slurry medium, the pump system comprising a pump unit (101) consisting of at least two reciprocating positive displacement slurry pumps, both pumps being arranged for alternating intake of slurry medium via a slurry suction inlet (103) and discharge of slurry medium via a slurry discharge outlet (103); a pump drive unit (104) for driving the at least two reciprocating positive displacement pumps of said pump unit; as well as a slurry damping pump unit (105) for damping discharge pulsations in the slurry medium being pumped.

Abstract: A roll for a roller press suitable for comminution of granular material by interparticle crushing. The roll comprising a cylindrical body having an outer cylindrical pressing surface for use with an opposing roll in an interparticle crushing pressing nip and a plurality of outwardly extending wear-resistant surface studs positioned on the pressing surface. A strip element is provided on the outer cylindrical pressing surface of the cylindrical body.

Abstract: This disclosure relates to a hydraulic pump system for handling a slurry medium comprising at least two reciprocating positive displacement pumps, both pumps being arranged for alternating intake of slurry medium via a suction inlet and discharge of slurry medium via a discharge outlet, and piston/cylinder discharge valves for alternating closing and opening each discharge outlet. In a first aspect, a hydraulic pump system for handling a slurry medium, comprising at least two reciprocating positive displacement pumps, both pumps being arranged for alternating intake of slurry medium via a suction inlet and discharge of slurry medium via a discharge outlet, and piston/cylinder discharge valves for alternating closing and opening each discharge outlet, as well as control means for controlling the alternate closing and opening of both piston/cylinder discharge valves, such that during operation no volume difference occurs in the discharge of slurry medium is disclosed.

Abstract: A pump system for conveying a first fluid using a second fluid. The system includes at least a first pump having at least a first rigid outer casing defining a first interior space and a first flexible tube structure accommodated in the first interior space. The interior of the first flexible tube structure is arranged for receiving one of the first or second fluids. The region of the first interior space surrounding the first flexible tube structure is arranged for receiving the other of the first and second fluids. The first flexible tube structure is movable between laterally expanded and collapsed conditions for varying the volume of the interior of the first flexible tube structure, thereby imparting sequential discharge and intake strokes on the first fluid.

Abstract: A pump system using multiple reciprocating positive displacement pumps which phase shift is controlled by a phase shift controller. The phase shift controller uses a virtual master pump inside the phase shift controller which is used as a phase reference against which the phase shifts of the individual pumps is calculated. The phase shift controller adjusts the speed reference set-point for the variable speed drives of the individual pumps such that a desired phase shift is obtained and maintained. The operation of multiple reciprocating pumps using phase shift control can significantly reduce the pressure pulsation levels in the pump system. The use of a virtual master pump eliminates master slave scheduling and increases system reliability and availability as the operating of the phase control is not depending on the reliability of a real master pump.

Abstract: A positive displacement pump apparatus includes a pump chamber in a pipe system for receiving a pumping fluid, the pipe system having an inlet and an outlet which can be shut by a valve. The chamber is connected via an intermediate fluid chamber with a displacement element including a piston head and a piston rod, which is arranged to alternately carry out a suction stroke and a displacement stroke during its movement to displace fluid in the intermediate fluid chamber, thereby increasing or reducing the volume of the pump chamber. A flexible separating element including a diaphragm is provided at the pump chamber to separate the fluid in the intermediate fluid chamber from the pumping fluid. A force member is provided for applying force to the piston head during the displacement stroke to counteract force exerted on the piston head by the fluid in the intermediate fluid chamber.

Abstract: Disclosed is a pumping system comprising a pump having a rigid outer casing defining an interior space and a tube structure in the interior space, the tube structure being flexible and substantially inelastic. The interior of the tube structure defines a pumping chamber for receiving pumped fluid. The tube structure is movable between laterally expanded and collapsed conditions thereby providing discharge and intake strokes. The pumping chamber receives pumped fluid to cause the tube structure to move towards the expanded condition and undergo an intake stroke. The pumping chamber—undergoes a discharge stroke upon collapsing of the tube structure. The pumping system also comprises a delivery means and a supplying means for delivering pumped fluid to the pumping chamber and for supplying actuating fluid to an actuating region around the tube structure in timed sequence to cause the tube structure to undergo discharge and intake strokes.

Abstract: A pumping system comprising a pump (21) for conveying a pumped fluid using an actuating fluid. The pump comprising a rigid outer casing (25) defining an interior space (26), a tube structure (27) accommodated in the interior space (26), the tube structure (27) being flexible and substantially inelastic. The interior of the tube structure (27) defines a pumping chamber (28) for receiving pumped fluid. The tube structure (27) is movable between laterally expanded and collapsed conditions for varying the volume of the pumping chamber (28) thereby to provide discharge and intake strokes. The region of the interior space (26) surrounding the tube structure (27) defines an actuating region for receiving and accommodating actuating fluid. The pumping chamber (28) is adapted to receive pumped fluid to cause the tube structure (27) to move towards the expanded condition and the pumping chamber (28) thereby undergoing an intake stroke.

Abstract: A positive displacement pump apparatus (10) is disclosed for displacing a pumping fluid. The apparatus comprises one or more pump chambers (22) arranged in a pipe system for receiving the pumping fluid, the pipe system having at least one inlet (21?) which can be shut off by means of a valve (24?), and at least one outlet (21?) which can be shut off by means of a valve (24?). The one or more pump chambers 22 are connected via at least one intermediate fluid chamber (13?) with at least one displacement element in the form of a piston head (14) and a piston rod (15), which is arranged to alternately carry out a suction stroke and a displacement stroke during its movement so as to displace fluid in the intermediate fluid chamber (13?), which thereby increases and reduces, respectively, the volume of the pump chamber (22).

Abstract: The invention relates to a device for damping discharge pulsations in a medium being pumped through a system of pipes in a pulsating manner by a displacement pump that operates with a specific discharge characteristic, which device at least comprises a housing with an at least partially gas-filled damping chamber having a certain volume present therein, which housing can be connected to the system of pipes, in such a manner that an interface layer is present between the medium and the gas in the damping chamber during operation, which damping chamber has a desired gas pressure characteristic that partially depends on the discharge characteristic of the displacement pump, wherein the gas volume that is present in the damping chamber varies in time between a minimum compression volume and a maximum expansion volume under the influence of said discharge pulsations during operation, as well as adjusting means that supply gas to or discharge gas from the damping chamber The present invention provides a simpler and

Abstract: The invention relates to a diaphragm pump for pumping aggressive and/or abrasive media, such as slurries, comprising a diaphragm housing mounted in a substantially vertically disposed pipe system, which substantially vertically disposed pipe system comprises at least one inlet and at least one outlet positioned some distance above the inlet, as well as at least one substantially circular, flexible diaphragm, which diaphragm is movable within the diaphragm housing under the influence of a working liquid to be pressurised, in which the circular outer edge of the diaphragm is clamped down in the diaphragm housing by means of a circular clamping member. According to the invention, the diaphragm pump is characterized in that the circular clamping member is provided, on the circumferential edge thereof, with a flange that extends parallel to the plane formed by the clamping member.