Abstract: A hydraulic valve device includes a first inlet port (20) and a second inlet port (22) and a valve element (24) for selectively closing one of the first and the second inlet port. The valve element (24; 24?) is rotatable between two valve positions such that a surface of the valve element is moved in a direction parallel to openings of the inlet ports. The valve element includes two separate sealing portions (72, 74), a first sealing portion (72) for closing the first inlet port and a second sealing portion (74) for closing the second inlet port. The two sealing portions are arranged such that in a first valve position a first sealing portion closes the first inlet port and in a second valve position a second sealing portion closes the second inlet port. A centrifugal pump device includes such hydraulic valve device.

Abstract: The invention relates to a centrifugal pump assembly having an electric drive motor (2), at least one impeller (14) driven by said electric drive motor (2) and a valve element (24; 24?) rotatable between two 5 valve positions driven by a fluid flow produced by said impeller (14), wherein the valve element (24; 24?) has a cover plate (104; 104?) extending transverse to the rotational axis (X) of the impeller (14) and facing the impeller (14), wherein the valve element (24; 24?) having protrusions (102, 102?) arranged on an outer surface side facing away 10 from the impeller (14) such that a flow can act on them for driving the valve element (24; 24?).

Abstract: A pump assembly includes pump casing (2), an impeller (14) rotatably arranged in the pump casing, a two rotation directions (A, B) electrical drive motor connected to drive the impeller and a valve arrangement (28) arranged in the pump casing to switch a flow path downstream of the impeller between two exits (24, 26) of the pump casing, depending on a rotation direction of the impeller. The valve arrangement includes a first movable valve element (34) at a first exit (24) and a second movable valve element (36) at a second exit (26). The first valve element partly closes the first exit in a closed position and is movable into an opened position by flow in the first rotation direction and the second valve element partly closes the second exit in a closed position and is movable into an opened position by flow in the second rotation direction (B).

Abstract: A pump assembly includes pump casing (2), an impeller (14) rotatably arranged in the pump casing, a two rotation directions (A, B) electrical drive motor connected to drive the impeller and a valve arrangement (28) arranged in the pump casing to switch a flow path downstream of the impeller between two exits (24, 26) of the pump casing, depending on a rotation direction of the impeller. The valve arrangement includes a first movable valve element (34) at a first exit (24) and a second movable valve element (36) at a second exit (26). The first valve element partly closes the first exit in a closed position and is movable into an opened position by flow in the first rotation direction and the second valve element partly closes the second exit in a closed position and is movable into an opened position by flow in the second rotation direction (B).

Abstract: A heat exchanger unit is utilized for heating service water in a heating installation. The unit includes a plate heat exchanger a first connector, attached to a first fluid connection point of the heat exchanger, and a second connector, fastened to the heat exchanger. The first and second connectors each include at least one base element. The base element of the first connector and the base element of the second connector have an identical configuration. Each base element includes at least two distinct flow ducts.

Abstract: A service water heating unit (2), provided for use in a heating installation, includes at least one heat exchanger (6), defining a first flow path (10) for a heating medium and a second flow path (12) for service water to be heated. The two flow paths (10, 12) are guided relative to one another in a first portion (A) in a countercurrent arrangement with directions of flow oriented in opposite directions, and in a second portion (B) connecting downstream, viewed in the direction of flow of the service water, in a co-current arrangement with directions of flow oriented in the same direction.

Abstract: A service water heating unit (2) provided for use in a heating installation includes at least one heat exchanger (6), having a first flow path (10) in which a heating medium flows and a second flow path (12) in which service water to be heated flows, and a first circulation pump (46) which pumps the heating medium. The first circulation pump (46) is connected to the first flow path (10) of the heat exchanger (6) and mounted onto the heat exchanger (6). The service water heating unit (2) can also include a second circulation pump (76) mounted to on the heat exchanger (6), that pumps the heated service water.

Abstract: The invention relates to a heat exchanger unit (2), in particular for the heating of service water in a heating installation, comprising a heat exchanger (6), which is formed as a plate heat exchanger, a first connector (26), which is attached to a first fluid connection point (20) of the heat exchanger (6), and a second connector (30), which is fastened on the heat exchanger (6), wherein the first (26) and second (30) connectors each comprise at least one identical base element (28) which comprises, internally, at least one flow duct (32, 34).

Abstract: The invention relates to a service water heating unit (2), which is provided for use in a heating installation, comprising at least one heat exchanger (6), which comprises a first flow path (10) for a heating medium and a second flow path (12) for service water to be heated, and a first circulating pump (46) for the heating medium, which circulating pump is connected to the first flow path (10) of the heat exchanger (6) and is fastened on the heat exchanger (6), wherein a second circulating pump (76) is fastened on the heat exchanger (6) and serves as a circulation pump for heated service water.

Abstract: The invention relates to a service water heating unit (2) which is provided for use in a heating installation, comprising at least one heat exchanger (6), which comprises a first flow path (10) for a heating medium and a second flow path (12) for service water to be heated, wherein the two flow paths (10, 12) are guided relative to one another in a first portion (A) in a countercurrent arrangement with directions of flow oriented in opposite directions, and in a second portion (B) connecting downstream, viewed in the direction of flow of the service water, in a co-current arrangement with directions of flow oriented in the same direction.