In a recent Hydraulics & Pneumatics article, Jack L. Johnson, P.E., calls for revising the way engineers regard pump and motor models. His proposal to the National Fluid Power Association Technical Board calls for progressively more applications-oriented, real-world models — starting with basic pump output-flow and torque equations for initial ideal estimates. Johnson offers four different schemes that vary in magnitude of complexity and precision. The first three sacrifice progressive degrees of accuracy to produce easily solved models. The last model allows for variations for the specific pump in terms of torque losses, leakage, non-linearities, and experience of the modeler.

Max is the premier manufacturer of positive displacement flow meters for low flow, wide range, and rapid response measurements. High resolution outputs make it possible to fully characterize valve performance from drops per minute up through full flow.

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Researchers at Purdue University have demonstrated improved pump/motor efficiency with designs that eliminate flow-directing valves and incorporate textured microstructures on internal surfaces. Going valveless could cut fuel consumption up to 40%, with further savings from the textures that reduce friction and smooth internal flow.

Hyundai's new six-speed automatic transmission has a unique hydraulic pressure control system. Because of small manufacturing deviations from one solenoid valve to another, pressure fluctuations and differences affect shift precision and quality. To counter this, the new gearbox has adjustment screws in each of its eight valves, allowing them to be calibrated at the factory.

Looking like a superbike on steroids, the Carver One is billed as the only tilting car in the world. A Dynamic Vehicle Control hydraulic system governs tilt angle, which maxes out at 45 degrees. The lean angle is calculated based on the driver's steering action, vehicle speed, and front wheel cornering forces.

Telelogic Rhapsody modeling software from IBM has been critical in Eaton's development of hydraulic-hybrid vehicle power trains, soon to power a small fleet of UPS delivery vans. In modern vehicles, around 85% of system functions are software controlled. For such software-intensive architectures, the Rhapsody tool can cut development time by rapidly modeling the hydraulic controls.

Purolator Facet brings its extensive hydraulic filtration expertise to the industrial fluid market with our superior line of elements, breathers, strainers, and other accessories, using advanced materials and processes that provide cost-effective, dependable filter solutions. Click here for additional information.

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Elesa's SMN and SMW breather caps for pressurized hydraulic tanks have a single or double valve to smooth pressure fluctuations when fluid is rapidly added or drained. The valves prevent contaminants from entering and outflow or spillage. By sealing the tank, the caps allow a hydraulic pump to operate optimally and reduce foaming and cavitation.

For more on this subject, subscribe to GlobalSpec's e-Newsletter, DirectU2 The world of Valve Technology.

Cutting and crimping hydraulic hose can leave metal and elastomeric particles inside, contaminating fluid. Parker's Ultra Clean system fires air-powered projectiles through the hose to remove debris. Merely blowing compressed air down hoses leaves some particles behind, whereas the projectiles create a seal against the wall to push out contaminants.

Ground clearance, tight turning, and "a very good hydraulic system" are why this Australian strawberry grower bought a Lamborghini R3 EVO 100 tractor. An externally-mounted gear pump supplies an "open-center" hydraulic remotes (disconnects) system delivering 54 liters/min (14 gal/min) with flow control. There are three sets of double-acting, quick-release disconnects at the rear with drip recovery.

John Deere's 190 W and 220D W wheeled excavators offer more speed and maneuverability for on-highway and in-town work than tracked models. Both feature the Powerwise III engine/hydraulic-management system to maximize power output with quick, smooth operations. The LCD monitor allows for real-time changes in hydraulic flow and and onboard diagnostics.

MAIN Manufacturing produces and stocks a vast array of Flange Pad Adapters. Convert hydraulic mounting pads between Code 61 and Code 62, change size or orientation, inch and metric bolt holes, or change between square (DIN, JIS, or special) and SAE. Ready for immediate shipment or made within 3-4 days.

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