Abstract: A compound water meter includes a housing having opposite inlet and outlet ends, a water guidance channel extending between the inlet and outlet ends and defining a direction of flow therebetween and upper opening disposed above and in communication with the water guidance channel, a main meter measuring inset disposed in the housing across the water guidance channel, a switch-over valve inset disposed in the housing across the water guidance channel and connected watertight with the main meter measuring inset, and an impeller rotatably supported directly by and between the respective insets such that the main meter measuring inset is disposed upstream and the switch-over valve inset downstream of the rotatable impeller relative to the direction of flow. Both insets form an inset unit and with the impeller are suspended in the housing by a cover which closes the upper opening of the housing. The main meter measuring inset has a hub rotatably supporting the impeller.

Abstract: A switch-over valve for a compound water meter includes an annular-shaped housing defining an annular valve seat and a central throughflow cross section, a pivot extending across the housing and supported at opposite ends in opposed portions of the housing, a closure member formed by a divided flap having a pair of wings disposed along opposite longitudinal sides of the pivot and articulated by the pivot for movement between opened and closed positions relative to the annular valve seat and the central throughflow cross section and a spring disposed about the pivot biasing the wings toward the closed position. The two wings of the divided flap are connected hinge-like one with the other along and via the pivot which extends along and in the region of division of the flap. The divided flap, due to its construction, has gaps along its region of division and along the pivot which are covered by a flat flexible seal disposed on an upstream side of the divided flap.

Abstract: The turbine flowmeter includes an impeller wheel mounted, so that it can rotate, between an upstream hub and downstream hub in a tubular element. The hubs are mounted securely in the tubular element by ribs. A device for regulating to compensate measuring errors resulting from manufacturing tolerances is provided at least on the upstream hub.

Abstract: The turbine flowmeter includes an axially movable rotatable impeller wheel (1) consisting of an impeller hub (3) and vanes (4) connected to it; a first fixed hub (5) on one side of the impeller wheel; a second fixed hub (6) on another side of the impeller wheel opposite from the side on which the first fixed hub (6) is located; bearing means (b) for rotatably mounting the impeller wheel (1) between the first fixed hub (5) and the second fixed hub (6) so that the impeller wheel (1) is axially movable; a first fluid coupling device including facing portions of the impeller hub (3) and the first fixed hub (5) and a second fluid coupling device including facing portions of the impeller hub (3) and of the second fixed hub (6). The facing portions of the impeller hub providing driving portions of the coupling devices and the facing portions of the fixed hub providing counterwheel portions.

Abstract: A hydrometric vane has a housing, an upstream casing and a downstream casing provided in the housing, an impeller rotatably supported in the housing and axially movable between the casings. The impeller has a hub which forms an annular chamber and extends into the downstream casing to form a gap therebetween so that when a fluid flows through the gap an underpressure loading the hub is caused and compensates a hydrodynamic pressure acting on the impeller. The hub has a central part and a cylindrical casing between which the annular chamber is formed. The downstream casing has at least one opening communicating with the annular chamber so that the liquid which leaves the annular chamber can flow through the at least one opening. A closure member is arranged on the central part and movable to a closing position in which it interrupts a communication between the annular chamber and the downstream casing.