The invention relates to a combination metering assembly for filling liquid products into containers. The invention is characterised by a base unit (1) and pump components (3, 4, 5, 6, 11, 12, 13, 14) of at least two different pump types for a metering operation, wherein the pump components of each pump type can be combined with the base unit in order to form a pump system of the corresponding pump type, and the base unit has connection means (19, 23) for this purpose which are compatible with the connections of the pump components. The combination metering assembly can be adapted to different metering situations with little complexity and has a comparably small space requirement.

A breast pump system comprising a solenoid valve includes a power source that is arranged to supply electrical power to the solenoid valve so as enable the solenoid valve to move between first and second positions. The breast pump system also includes a controller configured to detect a change in inductance of the solenoid valve that is indicative of the solenoid valve moving from first to second position and a control action in which the vacuum pump is stopped.

An oscillating positive displacement pump with at least one mobile part arranged to be movable relative to a fixed part. The mobile part is driven and drives a displacement element of the positive displacement pump. An electrodynamic drive is provided as a drive, on which a plurality of coils and permanent magnets are provided that are arranged on the mobile part of the drive respectively, and at least one guide member is provided on the drive, which allows the mobile part to move only along a degree of translation freedom. The positive displacement pump is designed as a diaphragm pump, which is associated with a measurement and control unit with a data storage and data processor, which processes a position signal of the mobile part and the strength of the drive current as a measured and/or control variable. An arrangement of a plurality of such positive displacement pumps and a method of operating at least one such oscillating positive displacement pump are also provided.

Automatic electric actuation of the pump of a liquid dispenser apparatus is provided by a stepper motor having a threaded hollow liquid-conducting tube positioned therein and configured such that motor drives the hollow tube up and down in response to supply of a plurality of electrical pulses thereto. A lower end of the hollow tube is constructed to inter-fit with a stem of the pump such that driving the hollow tube up and down creates a pumping action.

The invention relates to a combination metering assembly for filling liquid products into containers. The invention is characterised by a base unit (1) and pump components (3, 4, 5, 6, 11, 12, 13, 14) of at least two different pump types for a metering operation, wherein the pump components of each pump type can be combined with the base unit in order to form a pump system of the corresponding pump type, and the base unit has connection means (19, 23) for this purpose which are compatible with the connections of the pump components. The combination metering assembly can be adapted to different metering situations with little complexity and has a comparably small space requirement.

A liquid metal jet X-ray source including an electromagnetic pump for pumping the liquid metal. The electromagnetic pump includes a core having a core diameter and an outer yoke with a thickness of at least 20% of the core diameter. Preferably, the thickness of the outer yoke is at least 20% of the core diameter plus 6% of a radial distance between an outside of the core and an inside of the yoke.

An electromagnetic pump for pumping an electrically conductive liquid, including a first conduit section and a second conduit section. The electromagnetic pump further includes a current generator arranged to provide an electric current through the liquid in the first conduit section and the liquid in the second conduit section such that a direction of the electric current is intersecting the flow of the liquid in the first conduit section and in the second conduit section, and a magnetic field generating arrangement arranged to provide a magnetic field passing through the liquid in the first conduit section and the second conduit section such that a direction of the magnetic field is intersecting the flow of the liquid and the direction of the electric current.

A pump system contains a vibration actuator which can be electromagnetically driven by applying an alternating-current voltage E thereto, a sealed chamber connected to a suction port and a discharge port, and a movable wall for changing a volume of the sealed chamber. The movable wall is displaced due to drive of the vibration actuator to supply fluid in the sealed chamber into a target object. The pump system controls an effective value of the alternating-current voltage E so that an amplitude Y of the vibration actuator is constant.

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. In order to provide a method for moving a fluid or a corresponding metering pump with which a number of the aforementioned disadvantages are prevented without the need for additional components, it is proposed according to the invention that the movement of the displacement element in suction direction during the suction stroke involve at least two changes of direction before the displacement element reaches the second position and/or that the movement of the displacement element in pressure direction during the pressure stroke involve at least two changes of direction before the displacement element reaches the first position.

A pulsatile fluid pump system for driving a fluid pump assembly includes a reciprocating linear motor having a magnet and a coil, the magnet moving in relation to the coil, the coil having an electrical input. The pulsatile fluid pump system further includes a controller system having an electrical output coupled to the electrical input of the coil, and the controller system is configured to execute a waveform program defining an electrical waveform at the electrical output. The waveform program is configured to control operation of the linear motor by modification of a feature, selected from the group consisting of amplitude, frequency, shape, and combinations thereof, of the electrical waveform at the electrical output. The waveform program is further configured to accept a set of user-specifiable parameters defining the performance of the linear motor and to modify the electrical waveform in response to such parameters.