Abstract: A hydronic system (1) includes a side (3) with a first port (21) connected with a source element output (23), a second port (27) connected with a source element input (29), and a controllable primary side flow actuator (9) for providing a primary side flow (q1). Another side (5) has a third port (31) connected with a load element input (33), a fourth port (35) connected with a load element output (37), and a controllable secondary side flow actuator (13) providing a secondary side flow (q2). A transfer element (17) is connected with the first port, the second port, the third port and the fourth port. A flow control module (39) adapts a transfer element thermal power transfer by controlling the primary side flow actuator and/or the secondary side flow actuator by minimizing a signed deviation value (??v) that is correlated with the transfer element thermal power transfer.

Abstract: A pump assembly includes an electrical drive motor (2) and an impeller which is connected to the drive motor (2) via a shaft (14). The shaft extends between the drive motor (2) and the impeller, through a seal arrangement with a fluid reservoir (22). A method is provided for detecting a concentration change in a fluid reservoir in the seal arrangement in the pump assembly. A concentration sensor (30) detects a concentration change in the fluid reservoir (22), and a second sensor (32) detects at least one further parameter of the fluid reservoir (22). The sensors are arranged on the fluid reservoir (22). The sensors are connected to an evaluation device (22). The evaluation device (34) is configured to carry out an evaluation of at least one reading of the concentration sensor (30), taking into account at least one reading which is detected by the second sensor (32).

Abstract: A pump assembly (1) includes a rotor axle (45) extending along a rotor axis (R), an impeller (12) fixed to the rotor axle (45), a pump housing (11) accommodating the impeller (12), and a drive motor including a stator (17) and a rotor (51). The rotor (51) is fixed to the rotor axle (45) for driving the impeller (12). A rotor can (57) accommodates the rotor (51). The rotor can (57) include a rotor can flange (63). A stator housing (13) accommodates the stator (17). The stator housing (13) is secured to the pump housing (11) by a bayonet ring (113). The bayonet ring (113) is resiliently spring-loaded for axially biasing the stator housing (13) towards the impeller (12) against the pump housing (11).

Abstract: A circulation pump assembly for a heating and/or cooling system includes an electric drive motor (108) and a connected pump housing (106) in which at least one impeller (118) is situated and which comprises a first inlet (112) and a first outlet (114). The pump housing (106) includes a second inlet (122) which is connected in an inside of the pump housing (106) at a mixing point (130) to the first inlet (112). A regulating valve (134), which is designed for regulating the mixing ratio of two flows mixing at the mixing point (130), as well as a control device, which controls the regulating valve (134) for regulating the mixing ration, are arranged in the pump housing (106). A hydraulic manifold is provided with such a circulation pump assembly.

Abstract: A hydraulic construction unit includes a centrifugal pump assembly which includes an electrical drive motor and at least one impeller which is driven by the electric drive motor. At least one valve element is arranged such that the valve element is movable by way of a fluid flow which is created by the impeller. At least one section of a wall delimits a flow path in the hydraulic construction unit and is configured to be movable as a moveable section. The movable section of the wall is part of the valve element or is connected to the valve element for movement. The movable section is movable so as to be at least partly effected by friction forces of a fluid flow which runs along the wall.

Abstract: A centrifugal pump (7), with one or more pumping stages, includes a pressure controlled valve (15) inside the pump (7) for supporting self-priming, the pressure controlled valve (15). The pressure controlled valve (15) includes a pretensioned leaf spring (17) and a valve seat (18). The leaf spring (17) has an opened position and a closed position. In the open position the leaf spring (17) is distanced from the valve seat (18). In the closed position the leaf spring (17) closes the valve seat (18). The leaf spring (17) and valve seat (18) are arranged for soft closing.

Abstract: A method of controlling a water reservoir supply pump arrangement determines a set value p, q, v, n of the pump arrangement based on an offset value pref, qref, nref, vref, G0 reduced by a component which is a function of a difference between an actual water level h and a predetermined water level href in a water reservoir. The difference is weighted by a proportional gain factor G. Further, a water reservoir supply pump arrangement is provided including at least one water pump and a control device for controlling the at least one pump.

Abstract: A diagnosis method for the diagnosis of the correct function of a heating and/or cooling system with at least one load circuit (6), through which a fluid flows as a heat transfer medium. For the diagnosis an opening degree (Vpos,n) of the load circuit (6) is changed for changing the flow. Subsequently a differential pressure (Hpu) across the load circuit (6) and/or a volume flow of a fluid flowing through the load circuit (6) is detected and the detected values, or at least a value derived from the detected values, are/is compared to at least one predefined system limit value.

Abstract: A method carries out an outside temperature-dependent control of at least one thermal power indicative parameter of a supply temperature of a first heating or cooling system in a first building (H). The control is carried out on the basis of the at least one thermal power indicative parameter. The at least one thermal power indicative parameter is indicative of the heat consumption or of the cooling power of at least one second heating or cooling system of a second building (H?, H?, H??), located at a distance from the first building, and is received via a data network (1), in particular, via the Internet. An arrangement is provided for controlling a first heating or cooling system of a first building, wherein the arrangement is adapted to carry out the method mentioned above. A server is further provided that is adapted to receive at least one thermal power indicative parameter.

Abstract: A submersible downhole pump (1) includes an elongate pump unit (3) defining a longitudinal pump axis (L) and a pump unit diameter (D), and at least one cable lug (13) for attaching a cable. The at least one cable lug (13) is connected to the pump unit (3) and pivotable around a pivot axis (P) perpendicular to the longitudinal axis (L) between a defined first position and a defined second position. The at least one cable lug (13) is positioned, in the first position, fully within the pump unit diameter (D). In the second position, the at least one cable lug (13) is positioned at least partially protruding outside the pump unit diameter (D).

Abstract: A video sequence of a pump assembly or of a pump assembly part is produced. The video sequence is evaluated by way of digital signal processing assisted by a data base. A condition of the pump assembly is determined by way of this evaluation. In particular it is determined whether the pump runs in a designated manner or it is determined whether unallowably high oscillations are ascertained in a region, wherein this would indicate a defect, for example bearing damage or an unfavorable speed.

Abstract: A pump seal leakage detection system (8) includes a leakage piping (13) including a collector pipe (21) and an air stream pipe (23), a sensor (15) positioned at the air stream pipe (23), and an air displacement device (17) for driving an air stream through the air stream pipe (23). The collector pipe (21) includes an inlet port (25) that is connectable to a leakage centrifuge (5), and an outlet port (27) into the air stream pipe (23). The sensor (15) is configured to detect a leakage drop at the outlet port (27) of the collector pipe (21) or in the air stream pipe (23). The air displacement device (17) is configured to blow a leakage drop off the outlet port (27) of the collector pipe (21) by an air stream towards an outlet port (35) of the air stream pipe (23).

Abstract: A centrifugal pump (1) includes a pump casing and a shaft (11) which is rotatably mounted therein and on which an impeller (10), for delivering fluid, is arranged rotationally fixed. A cartridge shaft seal (13) is arranged between the shaft (11) and an opening (16) of the casing, through which opening the shaft (11) is led. The cartridge shaft seal (13) includes a sleeve (22) which surrounds the shaft (11) at least in the region of the opening 16 and which is connected to the shaft (11) releasably and rotationally fixed, by way of a clamping device (29) which is arranged on the outer side of the sleeve (22). The clamping device (29) includes clamping jaws (32) which only engage on the outer side of the sleeve (22) and non-positively connect the sleeve (22) to the shaft (11).

Abstract: A pump assembly (1) includes an impeller with a rotor axis (R). A pump housing (11) accommodates the impeller. A drive motor with a stator (14) and a rotor (51) drives the impeller (12). A rotor can (57) accommodates the rotor (51), and a stator housing (13) accommodating the stator (14). The rotor can (57) is mounted by a first coupling to the pump housing (11). The stator housing (13) is mounted by a second coupling to the pump housing (11). The first coupling is located closer to the rotor axis (R) than the second coupling.

Abstract: The invention relates to a multistage pump (1), including a pump body (4), at a lower end of which a base element (2) is arranged, and at an upper end of which a head element (3) is arranged. At least the base element (2) is made from sheet steel and has an inlet port (5) and an outlet port (16). The inlet port (5) and the outlet port (16) are mechanically connected to each other by a pipe (6) running through the base element (2).

Abstract: A method controls a circulation pump (1) in an installation with at least two circulation circuits (3, 4), with which the circulation pump (1) is integrated by way of a switch-over valve (2) into the one or the other circulation circuit (3 or 4) depending on the switched position. The pump (1) is activated differently depending on the switched position of the switch-over valve (2). The switch-over procedure is detected by way of determining the pressure course and/or the flow rate course in the pump (1) or an electrical variable which is dependent thereon, of the motor driving the pump, and the pump (1) is operated in another manner accordingly.

Abstract: A pump assembly (1) includes an impeller (12) with a rotor axis (R), a pump housing (11) accommodating the impeller (12), a drive motor with a stator (14) and a rotor (51) for driving the impeller (12). A rotor can (57) accommodates the rotor (51), and a stator housing (13) accommodates the stator (14). The rotor can (57) includes a rotor can flange (63) having a lateral rotor can flange face (87) fitting within a peripheral wall (69) of the pump housing (11). The lateral rotor can flange face (87) has at least three radial projections (91) abutting against the peripheral wall (69) of the pump housing (11) and centering the rotor can (57) with respect to the peripheral wall (69) of the pump housing (11).

Abstract: A pump assembly has an electrical drive motor arranged in a stator housing (8) and has an electronics housing (18) which is connected to the stator housing (8) and in which at least one circuit board (40) with electronic components is arranged. At least one separate connection element (48; 62), which is designed a plastic shaped part, is arranged on or in the electronics housing (18). The connection element includes a first electrical plug connector (52; 66), connected to a corresponding electrical plug coupling on the circuit board (40), as well as a second electric plug connector (54; 68) connected to the first electrical plug connector (52; 66) via strip conductors (54). The second electric plug connector (54; 68) serves for the electrical connection of a component situated outside the electronics housing (18).

Abstract: A circulation pump assembly, with a wet-running electrical drive motor (4), includes a pump casing (6) as well as a motor housing (22) which is connected to the pump casing (6). The motor housing (22) is a combined stator and electronics housing that accommodates a stator (18) of the drive motor (4) as well as motor electronics (34). The motor housing (22), at a first axial end (24) facing the pump casing (6), is closed by an air gap sleeve (16) of the drive motor. The motor housing (22), at a second axial end (26) which is away from the pump casing (6), includes an opening (42) closed by a cover (28). An interior of the motor housing (22), in a region adjacent the first axial end (24), is filled with a potting mass (40) surrounding the stator (18) and the motor electronics (34).

Abstract: A hydraulic system includes at least one pump assembly and a switching device which includes at least two switch positions. The switching device is configured such that on operation of the pump assembly in a first operating condition, the switching device is held in a stable manner in each of the at least two switch positions in each case by the hydraulic forces in the system. In a second operating condition of the pump assembly, the switching device is moved from a first switch position into a second switch position, assisted by switching energy stored in the first operating condition. The hydraulic system is configured such that in the first operating condition, the switching energy is stored independently of a switching-over of the switching device between the switch positions. A method is provided for operating such a hydraulic system.