Abstract: A fitting for changing liquid paths, in particular for systems with a pressure exchanger, is provided. The pressure exchanger has pipes having alternating flow direction. The casing of the fitting includes an inlet piece, an outlet piece and a connection piece and at least one shut-off member connected to an actuator. The actuator is connected to a control device that controls the actuator to control a liquid flow between the inlet piece and the connection piece, or between the connection piece and the outlet piece. An actuator displaces a respective shut-off member arranged in each of the inlet piece and the outlet piece, with the shut-off members being axially displaceable to vary the size of flow openings that permit flow between the inlet piece and the connection piece or between the connection piece and the outlet piece.

Abstract: A pressure exchanger transferring pressure energy from a liquid in a first liquid system to a liquid in a second liquid system, having a housing with inlet and outlet connection openings for each liquid and a rotor arranged in the housing for rotation about a longitudinal axis. Through rotor channels are arranged around the rotor longitudinal axis with openings on each axial end face of the rotor. The rotor channels are arranged for connection through opposing flow openings facing the housing to the connection openings of the housing. During rotor rotation high pressure liquid and low pressure liquid are alternately introduced into the respective systems. Liquid flowing to the rotor through the openings generates a circumferential force (cu) for driving the rotor, and starting at or following the openings a flow guiding configuration formed as a rotor channel flow diverting contour is arranged in the rotor channels.

Abstract: A valve for switching over liquid paths, particularly for pressure exchanger installations with tubular pressure exchanger chambers (3) through which an alternating flow occurs, in which a rotatable control element (10, 10.1) having a plurality of flow paths is mounted in a housing (11), which in turn comprises a plurality of connection opening (12, 16, 17, 46) connected to a first pipe system and to an end of at least one pressure exchanger. Another end of the pressure exchanger is connected to a second pipe system through a valve. A motorized drive shaft (50) rotates the control element so as to alternately connect the control element flow paths to openings inside housing (11). Oncoming flow to the control element may come from an axial direction or from a radial direction, and outgoing flow from the control element occurs in the axial direction.

Abstract: A multistage centrifugal pump in which each stage includes a one-piece or multi-piece housing and an impeller disposed therein. The pump stages are arranged between an inlet end member and an outlet end member and retained therebetween by connectors so as to be connected to a flow-guiding system. All impellers are positioned on a single pump shaft that is supported by at least two pump bearings. One end of the pump shaft is provided with a device for receiving a connector of a drive unit, and outer support members are disposed at mounting points adjacent the end members in order to mount the centrifugal pump in its installation location. The pump shaft (3) is supported by two two pump bearings (11, 12), with the maximum distance (LL) between confronting sides of the two pump bearings (11, 12) being less than or equal to a minimum structural stage height (LM) multiplied by the number of pump stages (2.1-2.5) minus 1.

Abstract: A pressure exchanger for transferring pressure energy from a first liquid in a first liquid system to a second liquid in a second liquid system, having a housing with inlet and outlet connection openings for each liquid and a rotor (1) arranged in the housing for rotation about a longitudinal axis. A number of through rotor channels (2) are arranged around the rotor longitudinal axis with openings (4) on each axial end face of the rotor. The rotor channels (2) are arranged for connection through opposing flow openings formed in the housing to the connection openings of the housing such that during rotation of the rotor, high pressure liquid and low pressure liquid are alternately introduced into the respective systems.

Abstract: A pressure exchanger for transferring pressure from a higher pressure liquid in a first liquid system to a lower pressure liquid in a second liquid system having a housing (8) with inlet and outlet connection openings (10-10.3) for each liquid and a rotor (1) arranged in the housing for rotation about a longitudinal axis. The rotor has a plurality of through channels (13) arranged around the longitudinal axis with openings (12) on axial end faces (2, 3) of the rotor. The rotor channels (13) are connected to the connection openings (10-10.3) through flow openings (11-11.3) in the housing such that during rotation of the rotor high pressure liquid and low pressure liquid are alternately supplied to the respective systems. A predominantly axially extending flow transition is formed between the flow openings (11-11.

Abstract: A pressure exchanger for transferring pressure energy from a liquid flow of one liquid system to a liquid flow of another system including a housing provided with inlet and outlet lines for liquid flows having differing pressure states, and a cylindrical rotor disposed in the housing for rotation about its longitudinal axis. The rotor has a plurality of passageways located on an annular plane surrounding the longitudinal axis of the rotor and having an opening at each axial end face of the rotor. Inlet and outlet ports for the inlet and outlet lines are arranged in the housing at the ends opposite the end faces of the rotor, and sealing zones are arranged between the inlet and outlet ports. Radially extending sealing webs are disposed on the end faces of the rotor between the passageway openings.

Abstract: A pressure exchanger system having at least two tubular chambers, in which a plurality of reversing valves reverse the flow paths of fluid flows through the at least two tubular chambers. At least one driven reversing valve alternately reverses the flow paths between a supply source, which supplies a high-energy high-pressure fluid, and the tubular chambers. In reversing the liquid flows and shutting off previously open flow paths, the driven reversing element in the reversing valve executes a discontinuous or variable movement sequence.

Abstract: A valve for switching fluid paths, particularly for pressure exchanger installations with tubular chambers through which fluid flows in an alternating manner, including a rotatable closing element (12, 13) provided with a motorized drive shaft (14) and arranged inside a housing (2) having a plurality of connections (3, 4) for connecting lines leading to a pipe system and to a respective end of at least one pressure exchanger. Another end of each pressure exchanger is connected through a valve arrangement to a second pipe system. A splitter (7) provided with a plurality of overflow paths (17, 18, 27) is arranged inside the housing (2); mouths of the overflow paths are located on two axial end faces (10, 11) and on the circumference of the splitter (7), and a rotatable, disk-shaped control element (12, 13) is arranged in a sealing manner at each end face of the splitter (7).

Abstract: A multistage centrifugal pump in which each stage includes a one-piece or multi-piece housing and an impeller disposed therein. The pump stages are arranged between an inlet end member and an outlet end member and retained therebetween by connectors so as to be connected to a flow-guiding system. All impellers are positioned on a single pump shaft that is supported by at least two pump bearings. One end of the pump shaft is provided with a device for receiving a connector of a drive unit, and outer support members are disposed at mounting points adjacent the end members in order to mount the centrifugal pump in its installation location. The pump shaft (3) is supported by two two pump bearings (11, 12), with the maximum distance (LL) between confronting sides of the two pump bearings (11, 12) being less than or equal to a minimum structural stage height (LM) multiplied by the number of pump stages (2.1-2.5) minus 1.

Abstract: A valve for switching fluid paths, particularly for pressure exchanger installations with tubular chambers through which fluid flows in an alternating manner, including a rotatable closing element (12, 13) provided with a motorized drive shaft (14) and arranged inside a housing (2) having a plurality of connections (3, 4) for connecting lines leading to a pipe system and to a respective end of at least one pressure exchanger. Another end of each pressure exchanger is connected through a valve arrangement to a second pipe system. A splitter (7) provided with a plurality of overflow paths (17, 18, 27) is arranged inside the housing (2); mouths of the overflow paths are located on two axial end faces (10, 11) and on the circumference of the splitter (7), and a rotatable, disk-shaped control element (12, 13) is arranged in a sealing manner at each end face of the splitter (7).

Abstract: A valve for switching over liquid paths, particularly for pressure exchanger installations with tubular pressure exchanger chambers (3) through which an alternating flow occurs, in which a rotatable control element (10, 10.1) having a plurality of flow paths is mounted in a housing (11), which in turn comprises a plurality of connection opening (12, 16, 17, 46) connected to a first pipe system and to an end of at least one pressure exchanger. Another end of the pressure exchanger is connected to a second pipe system through a valve. A motorized drive shaft (50) rotates the control element so as to alternately connect the control element flow paths to openings inside housing (11). Oncoming flow to the control element may come from an axial direction or from a radial direction, and outgoing flow from the control element occurs in the axial direction.

Abstract: A pressure exchanger system having at least two tubular chambers, in which a plurality of reversing valves reverse the flow paths of fluid flows through the at least two tubular chambers. At least one driven reversing valve alternately reverses the flow paths between a supply source, which supplies a high-energy high-pressure fluid, and the tubular chambers. In reversing the liquid flows and shutting off previously open flow paths, the driven reversing element in the reversing valve executes a discontinuous or variable movement sequence.

Abstract: A centrifugal pump with an impeller which has a single helically-formed blade and which is not sensitive to sand abrasion or seizing of the impeller is achieved by providing the impeller (1) with a shielding plate (3) arranged on the suction side which transitions from an axial course given at the suction inlet of the impeller into a radial course, by providing that the blade entry angle (&bgr;1) in the area which is in danger of cavitation in the event of an abrupt onset of flow is at least 5° smaller than the angle of incident flow (&bgr;0), and thereafter the blade angle &bgr; in the axial region of a meridian section through the impeller (1) increases at least to the magnitude of the blade exit angle (&bgr;2), and finally a blade angle (&bgr;) exceeding the blade exit angle (&bgr;2) in the radial area of the meridian section decreases back down to the magnitude of the blade exit angle (&bgr;2).

Abstract: A housing for surrounding the impeller of a propeller pump, the housing having a gap ring disposed in a housing bore in the interior thereof, the gap ring being open at its circumference and in the uninstalled state having an outside diameter which is greater than the diameter of the bore which receives it, while in the installed state being pressed with bias against the housing bore which accommodates it due to the reduction of the ring's diameter. The gap ring of the invention which is open at its circumference advantageously reduces the cost of manufacture and assembly of gap rings for propeller pumps.

Abstract: An impeller of a centrifugal pump for transporting dirty liquids has transport elements, for example back-vanes or grooves disposed on the pressure side of a cover disk. The transport elements are arranged asymmetrically and are limited to one arc sector of the cover disk to create a transverse stream that rotates with the impeller. Solids which have penetrated into the space to the side of the wheel are carried out by this stream in the direction of the transport elements.