A fluid delivery system is revealed. A double diaphragm pump provided with two inlets and two outlets is mounted in the fluid delivery system. An introducing pipeline is connected to one set of inlet and outlet while a return pipeline is connected to the other set of inlet and outlet. Thereby a pneumatic mechanism in the double diaphragm pump drives two diaphragms therein to draw in and expel fluid in the system so that the fluid flows in and out through the two sets of inlets and outlets. Thus the pressure remains constant and the volume flow rate is uniform during delivery and returning of the fluid. A drain-back tube provided with a control valve is arranged between the introducing pipeline and the return pipeline. The fluid is returned and delivered under control of the control valve while changing fluids or cleaning pipelines of the system.

The present invention concerns a diaphragm unit (1) for a diaphragm pump comprising a diaphragm core (2) having a receiving means (3) for a thrust rod (4, 4, 4) of a pump drive, and a multi-layer pump diaphragm (5) connected to the diaphragm core (2), wherein the pump diaphragm (5) has a fluid-impermeable working diaphragm layer (6) which in operation of the diaphragm pump comes into contact with a fluid to be delivered by the diaphragm pump, and a fluid-impermeable safety diaphragm layer (7), a sealed volume (12) for receiving a fluid passing through the working diaphragm layer, that is arranged between the working diaphragm layer (6) and the safety diaphragm layer (7), and a first clamping region (9) with which the pump diaphragm (5) can be received in a receiving means of the diaphragm pump, wherein the first clamping region (9) forms a ring which annularly surrounds the diaphragm core (2). To provide a diaphragm unit for a diaphragm pump which in a simple fashion permits detection of a rupture of the working diaphragm layer, according to the invention it is proposed that provided within the ring formed by the first clamping region (9) is at least one element (13, 27, 25) of a sensor for detecting a fluid which penetrates into the sealed volume (12) of the pump diaphragm (5).

A fluid filtration assembly includes a filter housing having a first end for fluid connection with a fluid storage vessel. A filter cartridge is disposable within the filter housing, and a plunger pump is coupled at a second end of the filter housing. The plunger pump includes a housing having a rigid portion and a flexible portion. The flexible portion has a plunger-engaging portion for coupling to the plunger of an actuator. The flexible portion selectively movable with respect to the rigid portion via the actuator. The filter cartridge can be a hollow fiber filter. The plunger pump can be configured to induce alternating tangential flow in at least a portion a the assembly. The fluid filtration assembly can be provided as a disposable single-use arrangement.

A diaphragm pump includes a reciprocable diaphragm, an actuator including a motor, and a control device. The control device resets an origin of the diaphragm in a reciprocating direction, when detecting a step-out of the motor. After resetting the origin, the control device activates the actuator to move the diaphragm to the origin.

A pump device includes a piezoelectric pump, a piezoelectric pump, and a driving circuit. The piezoelectric pump is driven at a first frequency when singly driven. The piezoelectric pump is driven at a second frequency when singly driven. The driving circuit drives the piezoelectric pump and the piezoelectric pump at the same driving frequency.

A method is for calibrating a peristaltic pump, and for dispensing a quantity of liquid by a peristaltic pump. A device for producing sterile preparations that can execute the methods.

A double membrane for a diaphragm pump for fluidizing, covering and conveying dusty products, such as, for example, pulverized coal, with the aid of an inert gas at pressures of up to 7 MPa, the diaphragm pump having a porous, curved loosening element made from aluminum, monitors and ensures the membrane tightness by designing the double membrane with an integrated pressure sensor for monitoring leakages. A hermetically tight separation between the hydraulic chamber and dust chamber of the diaphragm pump can therefore be ensured and damage to the membrane can be promptly identified. Complicated repair and cleaning measures of the entire dust system or hydraulic system in the event of membrane damage are prevented and the tightness of the membrane is maintained during the incident. Particular refinements relate to the composition of the individual membranes and the interaction thereof.

A control unit includes a first connector configured to connect a proportional pressure regulator to a positive pressure supply and a second connector configured to connect the proportional pressure regulator to a negative pressure supply. The control unit further includes at least one sensor configured to detect an amount of air flow (volume per unit of time), positive or negative, within an air flow line connected to an output of the proportional pressure regulator, and a third connector configured to connect the air flow line to an air side of a diaphragm. Additionally, the control unit includes a controller programmed to control at least an opening and closing function of the proportional pressure regulator to attain a desired amount of air flow (volume per unit of time), positive or negative, within the air flow line.

Various systems and methods for detecting air in a chamber of an infusion system are disclosed. In one embodiment, a determination is made that air is contained in the chamber on the basis of a change in the average force exerted against the plunger utilizing a derivative spike for event detection and a systematic reduction in the average force to confirm the nature of the change. In another embodiment, a determination is made that the chamber contains air when a difference between the current force profile and a baseline force profile crosses a threshold. In an additional embodiment, a force profile is classified as being an air force profile or a liquid force profile based on extracted features of the force profile.

Provided is a tube pump system which includes: a pair of roller units which are rotated around an axis line from a closing position to a releasing position; a pair of drive units which are configured to respectively rotate the pair of roller units; a control unit which is configured to control each of the pair of drive units; and a pressure sensor which is configured to detect a pressure of a liquid in a pipe connected to the other end of the tube, wherein the control unit controls a first rotation angle when the first roller unit passes through the closing position and a second rotation angle when the second roller unit passes through the releasing position such that fluctuation of the pressure of the liquid when the pair of roller units are rotated through at least one revolution falls within a predetermined value.