Abstract: Apparatus and methods for filling a pressure compensated fluid container with a liquid. An example method includes restraining movement of a piston slidably disposed within the fluid container in a first piston position, wherein the piston divides the fluid container into first and second portions. The method further includes pumping the liquid into the first portion to compress gas located within the first portion, stopping the pumping of the liquid into the first portion, and stopping the restraining of movement of the piston to permit the piston to move to a second piston position due to expansion of the gas compressed within the first portion.

Abstract: A hydraulic system for a work machine includes an operation member, a prime mover, a hydraulic pump driven by the prime mover, the hydraulic pump configured to output an operation fluid, a first temperature sensor to measure a temperature of the operation fluid, a first fluid tube connected to the hydraulic pump, an operation valve connected to the first fluid tube, the operation valve configured to control, in accordance with an operation extent of the operation member, a pressure of the outputted operation fluid, a hydraulic apparatus driven by the operation fluid outputted from the operation valve, a second hydraulic tube connecting the operation valve to the hydraulic apparatus, a discharge fluid tube to discharge the operation fluid included in the second fluid tube; and an actuation valve disposed on the discharge fluid tube, the actuation valve configured to control an aperture of the actuation valve based on the temperature.

Abstract: A system for emergency lubrication, with a lubricant pump (113) and with at least one outlet opening (125) for delivering lubricant to at least a first lubrication point (107) of a transmission (101), in particular a transmission of a wind turbine. The system includes a first cavity (203), and the lubricant pump (113) is designed to convey at least some of the lubricant into the first cavity (203). The first cavity (203) is designed to store the lubricant intermediately and to act upon the intermediately stored lubricant with positional energy. In addition, there is a lubricant-conveying connection between the first cavity (203) and the outlet opening (125).

Abstract: A hydraulic circuit may be provided.

Abstract: Cut-in-cut-out valves for hydraulic circuits. The hydraulic circuits include a hydraulic pump outputting a variable pressure controlled by a slaving line, an accumulation circuit, a return line to the reservoir, a cut in-cut-out valve. The hydraulic circuits also include a cut-in-cut-out valve having four orifices, a first orifice connected to the supply line, a second orifice connected to the slaving line, a third orifice connected to the return line leading to the reservoir, and a fourth orifice connected to the accumulation circuit. The cut-in-cut-out valve alternates between two positions as a function of the pressure in the accumulation circuit, a cut-in position in which the first, second and fourth orifices are connected to each other, and a cut-out position in which the first and fourth orifices are closed.

Abstract: A hydraulic flow sensing apparatus is provided. The apparatus includes: a manifold; a hole in the manifold in fluid communication with a fluid pathway; a poppet valve in the hole in the manifold configured to move when fluid in the pathway flows; and a proximity switch configured to detect movement of the poppet valve. A method of operating a hydraulic circuit may also be provided.

Abstract: A hydraulic pressure control apparatus for an automatic transmission may include a first hydraulic pump connected with an oil tank to receive oil from the oil tank, having a first motor, and adapted to generate a low pressure through an operation of the first motor, a second hydraulic pump connected with the first hydraulic pump to receive the low pressure, having a second motor, and adapted to generate a high pressure through an operation of the second motor, a first regulating valve adapted to receive the low pressure from the first hydraulic pump and to regulate a first operating pressure to supply to the torque converter, and a second regulating valve adapted to receive the high pressure from the second hydraulic pump and to regulate a second operating pressure to supply to the powertrain.

Abstract: A power pack unit includes a first hydraulic pump including a first pump enclosure accommodating a first pump cartridge. A second hydraulic pump includes a second pump enclosure accommodating a second pump cartridge. A hydraulic fluid reservoir is positioned between the first and second hydraulic pumps. A first end of the reservoir is secured to the first pump enclosure and a second end of the reservoir is secured to the second pump enclosure. The first and second hydraulic pumps and the reservoir can extend along a common axis. First and second motors can be connected to the first and second pumps. The entire structure can extend along a common axis.

Abstract: A stack valve 1 includes a boom direction switching valve 11 (first direction switching valve) connected to an unloading path 21 and a service valve 13 (second direction switching valve) connected to the unloading path 21 at the downstream of the boom direction switching valve 11. At changeover positions 11a and 11c at which the unloading path 21 on the upstream side is connected to one of the supply and discharge paths 29 and 30 and the other one of the supply and discharge paths 29 and 30 is connected to the unloading path 21 on the downstream side, the boom direction switching valve 11 is connected to a boom valve tank return path 27 which connects the other one of the supply and discharge paths 29 and 30 with the tank path 22.

Abstract: A combination wet kit includes a single mounting bracket supporting an end dump/return manifold and a walking floor/side dump/low boy manifold, as well as a support bracket for the hydraulic fluid filter. A three-way valve is positioned between the end dump/return manifold and a walking floor/side dump/low boy manifold. The manifold unit attached to the tractor without requiring holes in the tractor frame. The manifolds and the preassembled nature of the manifold assembly greatly simplify and reduce costs for installation of the combination wet kit.

Abstract: Methods and systems provide a simulation of cavitation damage. In one implementation, a computer-implemented method simulates a potential for cavitation damage. According to the method, data defining a modeled component is imported to a flow solver tool. The flow solver tool simulates a liquid that flows through the modeled component. Voids created by the flow of the liquid cause a plurality of vapor implosion pressure events. The method further includes displaying a histogram showing a portion of the modeled component. On the histogram, locations of the plurality of vapor implosion pressure events are visually distinguishable on a surface of the portion of the modeled component.

Abstract: A hydraulic unit, comprising a tank case for accommodating a hydraulic medium, in which a hydraulic pump is disposed and is adjoined by a valve block on which at least one controllable valve is arranged in a supply line to a hydraulic user, and an electric motor which has a stator housing on the side of the valve block that is opposite the tank case, and the shaft of which is coupled to the hydraulic pump via the valve block, characterized in that the valve block and stator housing are integrally formed.

Abstract: A hydraulic pressure generating apparatus includes a hydraulic oil feed line for feeding hydraulic oil with high pressure from an oil tank to a hydraulic pressure control system of a generator by an oil feeding pump unit, a hydraulic oil return line for returning drain oil from the hydraulic pressure control system to the oil tank, and a circulation line for circulating and purifying the hydraulic oil of the oil tank by a circulating pump unit. In such apparatus, the hydraulic oil is flame resistant hydraulic oil which is hardly deteriorated by direct heating, and the flame resistant hydraulic oil is heated by a heater disposed in the oil tank.

Abstract: A device for pumping fluid has a hydraulic pump (10) and a drive (12). The hydraulic pump (12) is produced as an independent component with different types of drive devices (12) as additional components that can be coupled in the form of a modular system, and is configured as a coupling piece (14) for this purpose. Hydraulic tanks (16) having different volumes represent a third, different type of component. Each hydraulic tank (16) can be connected on one side to the coupling piece (14). The corresponding drive device (12) can be connected on the opposite or same side of the coupling piece (14). The coupling piece (14) is built as a single component and embodied in the form of a base plate. The hydraulic pump (10) is an external gear pump (20), whose toothed wheels (22) are received or integrated into the base plate. A compact, modularly constructed building block system is achieved which is functionally reliable and easy to maintain.

Abstract: A hydraulic power assembly (10) includes an electric motor (30) disposed on a removable top (26) outside a tank (12) defining a chamber (25). A first pump (32) depends from the removable top (26) and into the chamber (25) and includes a first inlet (34) and a first outlet (35) to deliver fluid to a fluid line (36) and a fluid distribution manifold (38) disposed on the removable top (26). A leakage line (52) extends from the pump (32) and through the removable top (26) and back through the removable top (26) and drains into the chamber (25) for determining if the pump (32) is operating efficiently. A heat exchanger (78) is adjacent the motor (30) for cooling the hydraulic fluid as it is returned into the chamber (25) thereby cooling the fluid in the chamber (25). The tank (12) also includes a liner (74) for reducing the noise of the pump (32).

Abstract: A hydraulic power assembly (10) includes an electric motor (30) disposed on a removable top (26) outside a tank (12) defining a chamber (25). A first pump (32) depends from the removable top (26) and into the chamber (25) and includes a first inlet (34) and a first outlet (35) to deliver fluid to a fluid line (36) and a fluid distribution manifold (38) disposed on the removable top (26). A leakage line (52) extends from the pump (32) and through the removable top (26) and back through the removable top (26) and drains into the chamber (25) for determining if the pump (32) is operating efficiently. A heat exchanger (78) is adjacent the motor (30) for cooling the hydraulic fluid as it is returned into the chamber (25) thereby cooling the fluid in the chamber (25). The tank (12) also includes a liner (74) for reducing the noise of the pump (32).

Abstract: The invention is a subsea pump that includes pumping elements, each pumping element including a pressure vessel with a first and a second chamber therein and a separating member disposed between the first and second chambers. The first and second chambers are hydraulically connected to receive and discharge a hydraulic fluid and a drilling fluid, respectively. The separating member moves within the pressure vessel in response to a pressure differential between the first and second chambers. A hydraulic power supply is arranged to pump the hydraulic fluid to the first chamber of each of the pumping elements. A valve assembly is hydraulically coupled to the first chambers of the plurality of pumping elements and to the hydraulic power supply. Volume measurement devices are arranged to measure volumes of each of the first chambers and the second chambers.

Abstract: A reservoir for power steering fluid includes an upright housing that forms an upper interior space for storage of a reserve fluid supply, and a lower interior space containing a fluid filter. Fluid connectors are provided for causing fluid to flow in a circumferential swirling pattern as it moves through the filter, such that the flowing fluid has a relatively long residence time in the lower portion of the reservoir for achievement of an effective cooling action. The fluid filter is connected in a return line form the power steering unit to the associated pump, so that the filter exerts a back pressure on fluid flowing from the power steering unit to the filter.

Abstract: A reservoir for power steering fluid includes an upright housing that forms an upper interior space for storage of a reserve fluid supply, and a lower interior space containing a fluid filter.* Fluid connectors are provided** for causing fluid to flow in a circumferential swirling pattern as it moves through the filter, such that the flowing fluid has a relatively long residence time in the lower portion of the reservoir for achievement of an effective cooling action. The fluid filter is connected in a return line from the power steering unit to the associated pump, so that filtered liquid is supplied to the pump. The fluid filter is preferably a flat disk-like filter unit located in a horizontal plane between the inlet fluid connector and the outlet fluid connector. *The upper interior space and lower interior space containing a fluid filter are separated by a frusto conical partition. Residence of the fluid above the frusto conical partition allows air entrained in the fluid to escape.