When a pipe pressure of a common discharge pipe during an independent discharge step in which only one reciprocating pump among a plurality of reciprocating pumps discharges a fluid to the common discharge pipe differs from internal pressures in pump chambers of the respective reciprocating pumps at discharge step start point angles, a stroke adjustment mechanism adjusts, on the basis of a pressure difference ΔP therebetween, effective stroke lengths of cross heads connected to plungers of the predetermined reciprocating pumps so that the internal pressures in the pump chambers reach the pipe pressure at the discharge step start point angles.

A peristaltic pump is provided for conveying a fluid pumping medium through a compressible hose. The pump is designed particularly for use in an aquarium, terrarium, or vivarium for metering fluids accurately and reliably by eliminating permanent tubing deformation and random stopping positions of rollers.

A filling device for dosed filling of a product from a product storage container into product dose receiving containers provided in a disposable isolator so to be protected against contamination. The device includes means for holding the product storage container together with the contents outside of the disposable isolator. The device includes a controllable product removal device for a dosed removal of the product from the product storage container. The device includes a product dispensing device for the dosed dispensing of the product to the product dose receiving containers. The device includes a line assembly interconnecting the product storage container and the product dispensing device to conduct the product to the product dispensing device. The device includes at least one ultrasonic flowmeter outside of the disposable isolator fixed to the outside of the line assembly to detect the flow rate. The device includes a controller for measuring the product dose.

A piston monitoring assembly includes a magnetic body coupled to a piston that is configured to move in opposite directions during a piston stroke to dispense a fluid, a magnetic sensor configured to output signals representative of a magnetic field generated by the magnetic body, and a controller configured to examine the signals output by the magnetic sensor and to determine whether the piston is moving far enough to ensure that the fluid is being dispensed during a first movement of the piston in the piston stroke and that the fluid is prevented from being dispensed during a second movement of the piston in the piston stroke.

A pumping system includes a head having an opening and an injection port. The head is for holding content to be forced through the injection port. A bladder is within the head. The bladder is between the content and the opening. A plunger is configured to move through the opening of the head and to apply force within the bladder. The plunger may be movable in a discharge stroke to force the bladder against the content and thereby force the content through the injection port.

A pumping system includes a head having an opening and an injection port. The head is for holding content to be forced through the injection port. A bladder is within the head. The bladder is between the content and the opening. A plunger is configured to move through the opening of the head and to apply force within the bladder. The plunger may be movable in a discharge stroke to force the bladder against the content and thereby force the content through the injection port.

The invention relates to a method for determining an amplitude A of a pump-induced fluid pressure fluctuation of a fluid which is regulated to a desired fluid pressure p.sub.soll by means of a pump. In this case, the method comprises providing (S1) a pressure signal of the fluid, determining (S2) the amplitude A of the fluid pressure fluctuation on the basis of the pressure signal which has been provided, checking (S3) whether the pressure signal which has been provided satisfies a predetermined plausibility criterion, and outputting or rejecting (S4) the determined amplitude A on the basis of whether the pressure signal which has been provided satisfies the predetermined plausibility criterion. This advantageously provides a combined method in which, in addition to fundamentally determining the amplitude A of a fluid pressure fluctuation, a plausibility check is also carried out immediately in order to determine whether this fluid pressure fluctuation also actually corresponds to a representative value for the current system state. Furthermore, the invention also relates to a device which is designed to carry out the above-mentioned method and to a motor vehicle having a corresponding device.

Pump subsystem for fluid delivery (e.g., in a wearable patch pump) comprises a fluid chamber with pumping motion and a valve shaft assembly with valving motion, both being driven by the same drive mechanism. Fluid chamber has variable volume chamber provided by a piston driven by the drive mechanism and translated relative to a plug in the pump housing. Piston extends the fluid chamber during an intake stroke and retracts the fluid chamber during a discharge stroke. Valve assembly has at least one valve shaft controllably translated by the drive mechanism to selectively align a first throughway with an opening in the pump chamber and a fluid intake port for an intake stroke to draw fluid into the fluid chamber, and align a second throughway with the opening in the pump hamber and a fluid discharge port for an discharge stroke to discharge fluid from the fluid chamber.

A liquid supply system includes a suction lance (6) configured to be inserted into a liquid container (14) and at least one level sensor (10, 12) fixed on the lance (6) and configured to detect a liquid level (22) inside a liquid container (14). A control device (4) is connected to the level sensor (10, 12) and configured to determine a rate of change of the liquid level (22) detected by the at least one level sensor (10, 12) and to detect a lance removal if the rate of change reaches or exceeds a predefined threshold. A method for detecting the removal of a suction lance (6) from a liquid container (14) is provided.

A dispenser includes: a plunger; a dispensing portion configured to dispense and suction liquid in response to an advance and a retraction of a distal end surface of the plunger along an axial line. The dispensing portion includes: a surrounding portion surrounding the distal end surface of the plunger about the axial line to define an accommodation chamber for accommodate the liquid to be dispensed; and an end portion facing the distal end surface of the plunger. The surrounding portion includes an inlet opening into the accommodation chamber to receive the liquid into the accommodation chamber. A distance from the inlet to the end portion is less than or equal to half of a maximum stroke of the distal end surface of the plunger.