Abstract: In one embodiment, a method is provided for performing a fluid process within a machine having a fluid system including at least two reservoirs of different types of fluids. The method includes the steps of identifying a first reservoir for use in performing a fluid process; (a) adjusting a configuration of a valve system operatively coupled to the fluid system to permit a fluid evacuation process to be performed for the reservoir, (b) subsequently performing the fluid evacuation process for the reservoir, (c) subsequently adjusting the configuration of the valve system to permit a fluid refill process to be performed for the reservoir, (d) subsequently performing the fluid refill process for the reservoir; and, subsequently identifying an additional reservoir and performing at least one of the steps (a), (b), (c) and (d) for the additional reservoir, wherein the first reservoir includes a fluid of a type which is different from a type of a fluid of the additional reservoir.

Abstract: A device for at least intermittently generating an overpressure in a system S in relation to an ambient pressure U includes a pump P that has a pressure side 20 and an intake side 10, where during the generation of an overpressure, the pressure side 20 is connected to the system S and the intake side 10 is connected to the ambient pressure by means of at least one first valve MV1, in particular a solenoid valve. At least one additional valve (ZV) is provided, which is connected in parallel to the first valve MV1 and can provide an additional cross section for the intake volume flow during the generation of an overpressure.

Abstract: An arrangement of high-pressure water devices in a paper machine including two or more consecutive sub-totalities for making paper is disclosed and includes pump devices for producing high-pressure water, high-pressure water operating devices located in a sub-totality, arranged in various consumption points, and connections to lead high-pressure water from the pump devices to the operating devices. The pump devices include at least one pump unit, from which connections are arranged to various consumption points, which belong to two or more consecutive sub-totalities. A method for arranging a high-pressure water device in a paper machine is also disclosed.

Abstract: A pressure reservoir is used to exert pressure on a hydraulic system with which, a gas exchange valve, for instance, of an internal combustion engine can be actuated. The pressure reservoir includes a housing and a piston that is prestressed in operation by a device. To enable making the pressure reservoir as small as possible, it is proposed that the device which prestresses the piston of the pressure reservoir has a characteristic force-travel curve, in one range of motion of the piston, that has a slope which differs from the slope in a different range of motion of the piston.

Abstract: A flow rate of unconnected first and second fluid flows is matched, such as, but not limited to, matching the flow rate of the replacement water stream with the waste water stream in kidney dialysis. The first and second flow paths are interconnected so substantially the same flow from a positive displacement pump in the first path encounters a flow-rate transducer in the second path. Transducer readings are taken for various values of the controllable pump speed of the pump. Then, the first and second flow paths are disconnected, a transducer reading is taken, and the flow rate of the fluid flow in the first flow path is controlled by controlling the pump speed using the value of the pump speed from the previous interconnected paths which corresponds to the value of the transducer reading from the previous interconnected paths which matches the transducer reading for the disconnected paths.

Abstract: A fluid transfer system and method for removing and replacing fluids in a fluid system. The fluid transfer system comprises an output hose coupled to an input line of the fluid system, and a return hose coupled to an output line of the fluid system. The fluid transfer system further comprises a low-level fluid sensor capable of being installed by an operator in a clean tank, and a high-level fluid sensor capable of being installed by the operator in a waste tank. The fluid transfer system further comprises a clean fluid pump for pumping clean fluid from the clean tank to the output hose. The fluid transfer system further comprises an operator adjustable clean fluid regulator to control a flow rate of clean fluid in the output hose, and an operator adjustable waste fluid regulator to control the flow rate of waste fluid in the return hose.

Abstract: A method of manufacturing a pump [10] for pumping various primary fluids. A body is formed from silicon dies [102,104]. A primary fluid channel [110] is formed in the body and a primary fluid supply [122] is coupled to the primary fluid channel [110] to supply a primary fluid to the primary fluid channel [110]. A mechanism for introducing a secondary fluid to an interface region of the primary fluid channel [110] is formed in the body. An energy delivery device is formed in the body to deliver energy to an interface between region between the primary fluid and the secondary fluid to create a thermal gradient along the fluid interface. The thermal gradient results in a surface tension gradient along the interface. The primary fluid will move to compensate for the surface tension gradient. Various semiconductor fabrication processes can be used to form the elements on the body.

Abstract: Mechanical complexity and high cost in a fluid flow control system are avoided through the use of a pulse width modulated (PWM) valve (20) to meter a fluid flow to an inlet (50) of a pump (16) that pumps the metered flow to an outlet (56) of the fuel pump (12). The system utilizes a pulsating vapor core in the pump (16) to dampen the pulses in the fluid flow generated by the PWM valve (20). A regulator valve (22) is provided to maintain a relatively constant pressure drop across the PWM valve (20). The control system is ideally suited for controlling the flow of fuel to a gas turbine engine.

Abstract: A device for metering flowable material is formed from two components which are movable relative to each other. The relative movement of the components varies the width of a gap between the components to control the flow of material through the gap. One of the movable components carries a rotatable element to direct the flow of material towards the gap, and a guide element is provided to direct propelled material into the gap. The rotatable element is preferably a disk, and the gap is a channel located proximate to the periphery of the disk. An element mountable to and rotatable with the disk can be provided to act on and reduce the size of solid or semi-solid material carried by flowing fluid to permit such material to flow through the device.