Abstract: A method includes driving a fluid pumping unit having a plurality of pumping cylinders via a plurality of hydraulic cylinders respectively of a hydraulic power unit. The method further includes controlling activation of the hydraulic power unit such that each stroke of the corresponding piston assembly between the top dead center and the bottom dead center follows a corresponding trapezoidal velocity profile with respect to a time duration. Controlling activation includes controlling flow of a hydraulic fluid in the hydraulic power unit so as to control the corresponding trapezoidal velocity profile with respect to the time duration of the corresponding piston assembly to obtain a predefined flow rate of the fluid medium from the pumping unit.

Abstract: A module, a base module and a system which comprises a module and a base module includes a pump channel and a valve unit which is connected with the pump channel wherein a fluid can be pumped through the pump channel and the valve unit, wherein a first wall section of the valve unit is flexible. The pump module has a movable valve body arranged in the valve unit, wherein the valve body can occupy an idle position in which the valve body closes the valve unit to prevent fluid from passing through. The valve body can occupy an operating position in which the valve body allows the fluid to flow through the valve unit and in which the valve body can be put in operating position through a deformation of the first wall section of the valve bodies so that the fluid can flow through the valve unit.

Abstract: A high-pressure fuel pump for an internal combustion engine. The high-pressure fuel pump includes an improved configuration that beneficially simplifies certain features of the high-pressure fuel pump. The fuel pump possesses an inlet check valve positioned along an inlet fuel circuit and an outlet fuel circuit of the high-pressure pump that provides a path for a low-pressure inlet fuel flow to and a path for a high-pressure output fuel flow from a pumping chamber of the fuel pump. Because of the configuration of the inlet check valve and the outlet check valve, the complexity of high-pressure fuel pump is beneficially reduced, decreasing the cost of components and assembly and improving the life and reliability of high-pressure fuel pump.

Abstract: A pump arrangement comprising two pump units, each pump unit comprising a pumping cylinder, a reciprocally movable pumping piston, said pumping piston delimiting a pumping chamber in the pumping cylinder in communication with a pump port for fluids, an actuator connected to the pumping piston, and determining a value dependent on the position of the pumping piston in the pumping cylinder, said pump arrangement further comprises a inlet and delivery valves connecting the pump port of each pump unit to a source line and a delivery line for pumped fluids, wherein the pump arrangement comprises at least one regulating unit the flow of the pumped fluids based on the value dependent on the positions of the pumping pistons in the pump units. Also a system comprising such a pump arrangement and a method for pumping fluids in said pump arrangement.

Abstract: The present application is directed to a submersible pumping system operable under hydrostatic pressure. The system suitably comprises a prime mover submersible within a first fluid; a pump means submersible within the first fluid and sealably coupled to the prime mover; and a fluid source in fluid communication with the prime mover, the fluid source providing a second fluid effective to act on the prime mover to power the pump means; wherein the second fluid is discharged in the first fluid after acting on the prime mover; and wherein the second fluid has a chemical composition substantially similar to the first fluid.

Abstract: A disc pump system includes a pump body having a substantially cylindrical shape defining a cavity for containing a fluid, the cavity being formed by a side wall closed at both ends by substantially circular end walls, at least one of the end walls being a driven end wall. The system includes an actuator operatively associated with the driven end wall to cause an oscillatory motion of the driven end and an isolator is operatively associated with the peripheral portion of the driven end wall to reduce damping of the displacement oscillations. The isolator comprises a flexible material, which in turn includes an RFID tag.

Abstract: A venturi ejector for forcibly ejecting a slurry or solution generated in a fluid dispenser, wherein the venturi ejector includes a venturi, the venturi being in a first flow communication with the slurry or solution and developing a vacuum, the vacuum being in a second flow communication with atmospheric pressure, the second flow communication acting to cause the atmospheric pressure to exert a pressure on the slurry or solution, thereby forcing the slurry to the venturi where the slurry or solution is forcibly ejected from the venturi. A method for forcibly ejecting a slurry or solution generated in a fluid dispenser is further included.

Abstract: An oil pressure relief valve for use in the oil pump lubrication system of an internal combustion engine is controlled by both oil pump outlet pressure and by pilot pressure from a pilot valve which is selectively applied by a control member, preferably a two-way valve that is operated by the engine control module. The pilot valve selectively supplies one of the oil pump outlet pressure or the engine gallery pressure to the control member which selectively supplies pilot valve pressure to the oil pump pressure relief valve which has a single piston. The pilot valve includes first and second pistons for selectively controlling back pressure from the pressure relief valve and for managing changes in oil pressure due to changes in the engine gallery to maintain a virtually constant pressure even as oil pump speed increases when the control member connects the pilot valve to the pressure relief valve resulting in a fuel economy benefit and improved control of the oil pump pressure.

Abstract: An eductor for conveying materials includes a body defining a first end and a second end and having a first inlet proximate the first end and a body outlet proximate the second end, the body defining a second inlet positioned between the first inlet and the body outlet, and the body defining an interior area. The eductor includes one or more inserts disposed within the body. The insert or inserts are manufactured from an abrasion resistant material.

Abstract: A switch (10, 200) is provided for installation in the air conditioning (A/C) system (12) in a vehicle (16) for intermittently operating the clutch (20) in the A/C system (12) each time the control (44) in the A/C system (12) provides power to operate the clutch (20) to prevent slugging. This turns the compressor (14) a few turns each time the clutch (20) is energized during intermittent operation to purge liquid refrigerant and lubricant from the compressor (14) to prevent slugging. The switch (10, 200) can be installed in existing vehicles by connecting the switch (10, 200) in the wiring harness (18) of the A/C system (12) to the power lead (38) from the control (44) to the clutch (20) and between the ground lead (40) from the clutch (20) and a ground. The switch (10, 200) can include a microcontroller (52) for controlling the operation of a power transistor (70) to intermittently ground the clutch to provide the intermittent operation.

Abstract: Methods for controlling the net-displacement of a rotary fluid pressure device are disclosed. One of the net-displacement control methods (47) includes obtaining a desired input parameter (23) and a relative position (21) of a first member (43) and a second member (35) of a fluid displacement mechanism. A determination of a first and second output value is then made for each of a plurality of volume chambers (45) when the volume chambers (45) are supplied with fluid at fluid inlet and fluid outlet conditions, respectively. A total output value is then computed for each of a plurality of control valve configurations (63) and compared to the desired input parameter (23). The control valve configuration (63) with the total output value most similar to the desired input parameter (23) is then selected. A plurality of control valves (15) are then actuated in accordance with the selected control valve configuration (63).

Abstract: An automated high-precision plunger pump for volumes of less than 1 microliter, which is used in the microscope-assisted micromanipulation of biological material, comprises a housing (1) and a pump head (8) that defines a working chamber (9) with a common or separate inlet and outlet opening (10), wherein the volume of the working chamber (9) can be altered by an axially movable plunger (7) that can be introduced into it. The plunger (7) is axially movable via a threaded spindle (5) or a spindle nut (6) arranged in threaded engagement on the threaded spindle (5), and the threaded spindle (5) and/or the spindle nut (6) can be rotationally driven and the respective other component is designed to be rotationally lockable.

Abstract: The invention relates to a reciprocating piston pump having a magnet drive and a first displacement chamber and a second displacement chamber, which are separated from each other by a piston, wherein both displacement chambers are connected to each other by a fluid-conducting channel. An overflow valve is arranged in the channel and allows a preferred flow from the first displacement chamber to the second displacement chamber, wherein an additional return valve is arranged either in a transition region between an inlet and the first displacement chamber or in a transition region between the second displacement chamber and an outlet, an armature of the magnet drive being firmly connected to the piston.

Abstract: Electronically controlled linear pump drive actuator for a dispensing pump has a servo motor unit having a stator with front and rear faces and a central hollow cavity, a rotor coaxially in the hollow cavity with a front portion having a front end with an open central bore and a shaft with a stepped diameter forming a rear extension, front and rear support members respectively for the front and rear faces, a support bearing in the rear member, a front bearing, and a position sensor; a ball screw drive mechanism having a nut connected with the rotor and a screw shaft having a front end section; a hollow cylinder attached to the front member's front end; an actuator member axially moveable in the hollow cylinder with a central rear part fixed to the front end section, and a hollow front part; and a pump plunger adaptor.

Abstract: Air compressor systems, upgrade kits, computer readable medium, and methods for controlling an air compressor for improved performance. The methods may include receiving a working air requirement; determining an estimated air pressure of the air compressor to deliver the working air requirement; measuring a pressure of the air compressor; comparing the measured pressure with the calculated estimated air pressure; if the measured pressure of the air compressor is greater than the determined estimated air pressure by a predetermined greater amount, then decreasing an output control of the air compressor; and if the measured pressure of the air compressor is less than the calculated estimated air pressure by a predetermined lesser amount then increasing the output control of the air compressor. The air compressor may be controlled based on a measured pressure of delivered working air. An oil control system may shut off oil to parts of the air compressor.

Abstract: The present invention relates to a cooling system of a refrigerator, particularly of a refrigerator including a refrigeration compartment and a freezer comprising a compressor attached to at least one condenser by a segment of a refrigerant tube, wherein a first refrigerant line leaves from the condenser and returns to the compressor, and a second refrigerant line leaves from the condenser and returns to the compressor. In the preferred embodiment of the present invention, the compressor has at least two suction inlets, wherein the first refrigerant line is connected to the first inlet and the second refrigerant line is connected to the second inlet, and both inlets have each a suction valve.

Abstract: A concrete pumping structure and a control method thereof are disclosed. The concrete pumping structure includes a first pumping cylinder structure and a second pumping cylinder structure. Each pumping cylinder structure includes a delivery cylinder (1), a water tank (3) and a driving oil cylinder (7). The delivery cylinder (1) has a concrete piston assembly (2) inside, and during the pumping process, a piston rod (6) of the driving oil cylinder (7) drives the concrete piston assembly (2) to reciprocate in the delivery cylinder (1), and the water tank (3) is positioned between the delivery cylinder (1) and the driving oil cylinder (7). The concrete pumping structure also includes a concrete return hydraulic system, which controls the two driving oil cylinders (7) and drives the two concrete piston assemblies (2) to return back to the water tank (3) during returning the concrete.

Abstract: A liquid lifting device includes: a liquid lifting tank storing liquid; an air pump pressurizing the interior of the liquid lifting tank; a liquid lifting pipe connecting the liquid lifting pipe to the liquid lifting tank having a liquid delivery port in the other end that stands upright; an air supply pipe in which one end portion of the air supply pipe connected to a branching section provided at a position halfway in the liquid lifting pipe and an upright section provided in the other end portion thereof; an air valve that is provided on the other end portion of the air supply pipe; and a liquid storage section that is formed in part of the liquid lifting pipe at a position between the liquid delivery port and the branching section and that is positioned below the branching section.

Abstract: A fluid transporting device includes an elastic tube, a tube frame that holds the elastic tube in an arc, a rotary push plate arranged in the arc for facilitating fluid flow inside the elastic tube, and a plurality of push pins disposed between the elastic tube and the center of the arc. Each push pin includes a semispherical end portion that contacts the rotary push plate, a pushing end portion that places a bias on the elastic tube, and adjacent end portions of at least two push pins close the elastic tube when the semispherical end portions are pushed by an outer circumference arc of the rotary push plate.

Abstract: A compressor includes a motor; a piston reciprocating by the motor; a crankcase comprising a wall portion formed with a communication hole, and the crankcase housing the piston; a cylinder body secured to an internal surface of the wall portion, the cylinder body and the wall portion defining a chamber, a capacity of the chamber increasing or decreasing by reciprocating the piston; and a cylinder head secured to an outer surface of the wall portion, and the cylinder head and the wall portion defining a flow path communicated with the chamber through the communication hole.