The invention relates to an actuating device (1) for mechanically controlling a membrane pump device (2), having a base body (4) which comprises a mounting face (7) for a membrane pump device (2) and through which a control fluid line (33, 35) passes which extends from a control fluid port (78, 79) to a control fluid opening (34, 36) which opens at the mounting face (7), a control fluid valve (74, 75) being arranged in the control fluid line (33, 35), which control fluid valve is designed to influence a cross section of the control fluid line (33, 35), and having an adjustment device (9, 14), which comprises a fluid actuator (38) arranged on the mounting face (7) for providing an adjustment movement, and a working fluid valve (81, 82) which is designed to influence a cross section of a working fluid line (85, 86) which passes through the base body (4), and the control fluid valve (74, 75) and the working fluid valve (81, 82) being electrically connected to a control device (70) which is designed to electrically control the control fluid valve (74, 75) and the working fluid valve (81, 82). Moreover, the invention relates to a membrane pump which has such an actuating device and such a membrane pump device, as well as to a blood treatment device which has such a membrane pump.

A power system has a piston pump that is driven by high pressure gas from a high pressure gas source that alternatingly pressurizes a first gas chamber and a second gas chamber to drive a first piston and a second piston such that the piston pump pressurizes hydraulic fluid from a hydraulic reservoir into a hydraulic accumulator. The expanded high pressure gas from the piston pump is expelled to a low pressure gas outlet and the pressurized hydraulic fluid is used as a motive fluid to perform work.

Fluid charging system can provide a higher inlet pressure than the ambient pressure for pumps intended to operated and comprises one or more subsea fluid reservoirs; one or more charge pumps configured to provide an output pressure higher than ambient pressure; various fluid conduits in fluid communication with the subsea fluid reservoirs and charge pumps; and various valves. Fluid is provided to a bladder at a first fluid pressure and fluid charging system used to provide protection for the subsea fluid reservoir and inlet conditions of the subsea pump. A second valve is used to protect the subsea fluid reservoir from pressure leaking back and a feedback loop used to protect inlet conditions of the subsea pump by setting the feedback loop valve to open near the maximum inlet condition.

A reciprocating-type piston compressor that can operate at very low speed (<300 rpm) with the ability to pump liquids. It can be configured with one or more double-acting cylinders. A variable speed drive can be used to adjust the operating speed of the compressor to control system torque requirements throughout the compression cycle.

The present invention relates to a system (100) for transporting a liquid from a reservoir (600) containing the liquid. The system comprises a first and second conduit (400, 500), each with a lower end (402, 502) and an upper end (404, 504), a first pump (200), with an inlet end (201) and an outlet end (202): wherein one of the lower end (402) of the first conduit (400) or the upper end (504) of the second conduit (500) is connected to a second pump (300): wherein a height difference between the first and second pump (200, 300) is within a maximum pumping height of a lower pump of the first and second pump (200, 300). Further, the present invention relates to a method for operating a plurality of pumps in a system (100).

The present invention is directed to a method for controlling the outlet temperature of an oil injected compressor or vacuum pump comprising a compressor or vacuum element provided with a gas inlet, an element outlet, and an oil inlet, said method comprising the steps of: measuring the outlet temperature at the element outlet; and controlling the position of a regulating valve in order to regulate the flow of oil flowing through a cooling unit connected to said oil inlet; whereby the step of controlling the position of the regulating valve involves applying a fuzzy logic algorithm on the measured outlet temperature; and in that the method further comprises the step of controlling the speed of a fan cooling the oil flowing through the cooling unit by applying the fuzzy logic algorithm and further based on the position of the regulating valve.

The invention relates to an apparatus having a pressure chamber and a micropump in fluid connection with the pressure chamber. The pressure chamber includes a gas-carrying region and a liquid-carrying region. The micropump is configured to generate a pneumatic pressure within the gas-carrying region that is lower than a fluid pressure of a liquid flowing through the liquid-carrying region. According to the invention, a gas-permeable and liquid-impermeable separating element separates, at least in sections, the gas-carrying region and the liquid-carrying region. According to the present invention, the micropump is disposed on the pressure chamber.

A remote pump manager is provided. The remote pump manager includes pressure sensors or a depth sensor operating to determine the change in pressure of a pump, a flow sensor operating to determine flow rate of fluid exiting the pump, a power meter operating to determine power data related to operation of the pump, and a management device having a programmable logic controller and a display. The pressure sensors, the flow sensor and the power meter are in communication with the management device. The management device operates to determine pump efficiencies, wherein the programmable logic controller automatically determines pump efficiency data in response to receiving real time data from the pressure sensors, the flow sensor and the power meter and automatically delivers the pump efficiency data to the display for displaying the determined pump efficiency data.

A suction manifold for providing fluid flow to a pump for hydraulic fracturing includes an input port configured to receive a flow of fluid from a source, a plurality of output ports configured to direct the flow of fluid to a plurality of corresponding cylinders of the pump, and a chamber configured to direct the flow of fluid from the input port to the output ports. The input port is configured to direct the flow of fluid in a direction parallel to a direction in which the output ports direct the flow of fluid.

A method and controller for creating a digital twin of a pump. The method includes receiving, by a controller, a specification curve corresponding to a centrifugal pump. The method includes building and executing, by the controller, a first model of the centrifugal pump, based on the specification curve. The method includes receiving sensor data corresponding to and during the operation of the pump. The method includes updating the first model according to the sensor data to produce an updated model, and storing the updated model as a digital twin of the centrifugal pump.