Abstract: The present invention relates to a check valve, and to a device having a check valve, and to a method of cleaning a check valve. In order to provide a check valve or a device having a check valve or a method of cleaning a check valve, in which sufficient cleaning of the non-flow-facing regions of the valve closing body is also ensured, it is proposed according to the invention that an element reducing the flow cross-section is provided in a region of the opening stop in addition to the opening stop so that, when the valve closing body is in the open position and the fluid flows through the check valve counter to the blocking direction, a non-flow-facing region of the surface of the valve closing body has at least an average wall shear stress of 50% compared to an average wall shear stress of a flow-facing region of the surface of the valve closing body.

Abstract: A closure device for a measuring chamber of an electrochemical sensor, a measuring chamber comprising such a closure device, and an electrochemical sensor comprising such a measuring chamber.

Abstract: The present invention relates to a method for moving a fluid comprising the steps a. providing a metering head comprising a metering chamber and a displacement element which delimits said metering chamber, b. moving the displacement element in a suction direction from a first position to a second position, wherein a volume of the metering chamber in the second position of the displacement element is greater than a volume of the metering chamber in the first position of the displacement element such that fluid is drawn into the metering chamber via a fluid inlet during a suction stroke, c. moving the displacement element in a pressure direction from the second position to the first position such that fluid is forced out of the metering chamber via a fluid outlet during a pressure stroke.

Abstract: The present invention relates to a diaphragm pump for conveying a fluid, a method for starting up a diaphragm pump for conveying a fluid and the use of a diaphragm pump for conveying a fluid.

Abstract: The present invention concerns a method of mixing aqueous solutions, an apparatus for carrying out said method and the use of dosing devices with integrated dosing monitoring and stroke length control in an installation for mixing container aqueous solutions.

Abstract: A membrane system comprising a membrane and connecting elements for connecting the membrane to a membrane pump for conveying a fluid, which membrane pump has a drive shaft designed for an oscillating translatory movement perpendicular to the plane of the membrane during operation of the membrane pump and has an external thread at an end portion for engagement with the membrane system by screwing. To ensure a secure and torque-proof connection between the membrane and the connecting element to be screwed to a drive shaft, the connecting elements comprise a threaded socket, a thrust ring and a thrust plate.

Abstract: A process for operating a pump, the pump having a conveying chamber for conveying a fluid, the pump having a displacement element, the displacement element delimiting the conveying chamber at least in sections, so that a change in the position or location of the displacement element causes a change in the volume of the conveying chamber, the pump having a drive, the drive having a coil through which an electric current is conductible, the coil having an ohmic resistance value RDC and an inductance Lcoil, the drive includes a pressure element and a coupling device, the pressure element and the coil being configured and arranged such that a magnetic field, generated by an electric current flowing in the coil causes a stroke movement of the pressure element along a longitudinal axis from an initial position P1 to an end position P2.

Abstract: The present invention concerns a dosing pump comprising a dosing chamber, a working chamber and a dosing diaphragm, wherein the dosing chamber and the working chamber are separated from each other by the dosing diaphragm, wherein there is provided a device for reciprocating movement of the dosing diaphragm between a first position and a second position, wherein the volume of the dosing chamber is smaller in the first position than in the second position. To provide a dosing pump, the dosing diaphragm of which has an increased service life and which as far as possible can be hydraulically operated even at very low dosing fluid pressures at the suction side it is proposed according to the invention that there is provided a prestressing device which prestresses the dosing diaphragm in the direction of the first or second position.

Abstract: A drive unit for a motor metering pump and a metering pump, including a drive chamber and a drive shaft arranged in the drive chamber. The drive shaft is rotated about a longitudinal axis in a direction of rotation during operation of the drive unit, the drive unit includes a bearing in which the drive shaft is mounted. The drive chamber is filled with a lubricant up to a filling level during operation of the drive unit, and the bearing is arranged above the filling level in the direction of the longitudinal axis. The drive shaft has a conveying channel for the lubricant, which extends from a first point below the filling level to a second point above the filling level and is arranged in such a way that, during operation of the drive unit, lubricant is transported from the first point to the second point.

Abstract: A dosing pump for conveying a fluid, having a displacement element and a dosing chamber, the displacement element delimiting the dosing chamber and being movable back and forth on a movement axis between a pressure position and a suction position, a drive being able to apply a driving force to the displacement element in the direction of the pressure position. A restoring force is exerted on the displacement element in the direction of the suction position by a biasing element. A stop element is provided which limits the movement of the displacement element in the direction of the suction position, and the stop element can be adjusted along the axis of movement via a control element which can be moved along a control axis in order to set a dosing volume of the dosing pump.

Abstract: Metering pump having a stationary portion and a pump portion, which is mounted in a linear manner and can be moved relative to the stationary portion in order to move a displacement body, wherein, for the purpose of achieving a long service life, the pump portion is connected in an electrically potential-equalizing manner to the stationary portion via an electrically conductive spring element.

Abstract: A hydraulically driven membrane pump for conveying a fluid, including a pumping chamber, a working chamber and a membrane which separates the pumping chamber and the working chamber in a fluid-tight manner, and means for reciprocating the membrane between a suction stroke position and a pressure stroke position, wherein the pumping chamber comprises at least one suction port through which the fluid to be conveyed is sucked into the pumping chamber in the suction stroke, and at least one discharge port through which the fluid to be conveyed is discharged from the pumping chamber in the pressure stroke, the membrane being connected on the working chamber side to a pull rod which is resiliently biased in the direction of the movement of the suction stroke.

Abstract: A metering diaphragm pump includes a metering chamber, a working chamber and a metering membrane. The metering chamber and the working chamber are separated from one another by the metering membrane. A device for moving the metering membrane back and forth between a first and a second position is provided. The volume of the metering chamber is smaller in a first position than in the second position, and a protective membrane is disposed next to the metering membrane on the working chamber side.

Abstract: The invention concerns a dosing pump for moving a fluid, comprising a dosing head in which there is a dosing chamber and a displacement element reciprocatable between a first and a second position, wherein the displacement element delimits the dosing chamber, and the volume of the dosing chamber in the first position of the displacement element is greater than the volume of the dosing chamber in the second position of the displacement element, wherein the displacement element is coupled to a linear motor by way of a stroke element in such a way that in operation of the linear motor the stroke element performs a forward stroke and a return stroke in a housing in a direction of a movement axis with a stroke length h and the displacement element is reciprocated between the first position and the second position.

Abstract: Module carrier for receiving a module having a fluid connection for use in a system for water treatment or water monitoring, wherein the module carrier can be reversibly connected to at least one further module carrier to form a module carrier assembly, wherein the module carriers can be connected to one another mechanically and detached from one another, wherein, during the mechanical separation or connection of the module carriers, at least one hydraulic connection between the module carriers can likewise be separated or connected.

Abstract: A diaphragm unit for a diaphragm pump includes a diaphragm core and a multi-layer pump diaphragm connected to the diaphragm core. The pump diaphragm has a fluid-impermeable working layer which comes into contact with a fluid to be delivered, and a fluid-impermeable safety layer. A sealed volume for receiving fluid passing through the working layer is arranged between the working layer and the safety layer. A first clamping region of the diaphragm forms a ring which annularly surrounds the diaphragm core. To detect a rupture of the working diaphragm layer, at least one element of a sensor is provided within the ring formed by the first clamping region for detecting fluid which penetrates into the sealed volume.

Abstract: A device for moving a fluid includes a dosing head in which a dosing chamber is arranged, and a displacement element which can be moved between a first and second position. The displacement element borders the dosing chamber, and the volume of the dosing chamber in the first position differs from the volume in the second position. drive unit for moving the displacement element from the first position to the second position and a return mechanism for moving the displacement element back are provided. The return mechanism has two magnetic parts. The first part is placed on the dosing head, the second part is connected to the displacement element, and the two parts are designed such that a magnetic force causes a force to be applied to the displacement element in the direction of the first position.

Abstract: A method for cleaning, conditioning, calibration, adjustment and conditioning of an amperometric sensor of a measuring device includes generating a conditioning agent in the measuring device, wherein either an oxidising agent which is reduced at the working electrode or a reducing agent which is oxidised at the working electrode is used as conditioning agent.

Abstract: A peristaltic pump includes a casing having a bottom, cover and wall forming a pump chamber, a tube connecting a casing inlet to a casing outlet arranged within the pump chamber, and a displacement element having at least two displacement members. The tube is arranged between the casing wall and the displacement element in such a way that due to rotation of the rotor the displacement members roll on the tube so the tube is squashed together so that a medium to be conveyed which is in the tube is displaced in the direction of the casing outlet. The displacement element has a first part fixed to the rotor and a second part which can be reciprocated between an operative position and a change position.

Abstract: A diaphragm pump having a conveying chamber and a working chamber, wherein the conveying chamber comprises a pressure connection and a suction connection, and the working chamber can be or is filled with a hydraulic fluid and is operatively connected to a pressure generator in order to apply an oscillating pressure to the hydraulic fluid, further comprising a diaphragm which has at least one diaphragm layer and a diaphragm core and which separates the conveying chamber and the working chamber from one another, and which can be moved from a pressure stroke position into a suction stroke position and back again, the volume of the conveying chamber in the pressure stroke position of the diaphragm being smaller than in the suction stroke position.