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This paper outlines the design philosophy and evaluation of the new “H” series variable displacement, medium pressure, open-circuit, axial piston hydraulic pumps. The “H” series is based on previously existing, technically successful, rotating group designs, but has significant design improvements affecting the areas of: Unit Weight Envelope Size Ease of Assembly, Disassembly, Repairability and Modification Alternate Fluid Capabilities The “H” series is a family of naturally aspirated pumps nominally rated at 250 or 275 bar (3625 or 4000 psig), depending on system operating parameters. The geometric displacements of the four units in the series are as follows: 57cc (3.5 cu. in./rev.) 74cc (4.5 cu. in./rev.) 98cc (6.0 cu. in./rev.) 131cc (8.0 cu. in./rev.)

Fixed displacement pumps will continue to be a popular choice for hydraulic system designers for decades to come. These pumps are used in almost every industrial and mobile market segment and are generally less expensive than comparable variable displacement type pumps. Fixed displacement “Vane Type” pumps are especially popular because of their low noise characteristics as well as their inherent repair features. The demand for “Vane Type” fixed displacement pumps continues to grow in all market segments. Because of this continued demand, a new design of “fixed displacement vane pumps” is being developed. These pumps, designated the VPF Series, are targeted to offer continuous operating pressures up to 280 BAR with displacements from 40 to 215 cc/rev.

Vickers Discovery Series EMV Electrohydraulic Mobile Valve is one of the most advanced new products introduced by Vickers in 1996. The EMV is a four-way proportional flow control valve intended for Load Sensing systems. The concept is based on separated meter-in and meter-out valve elements in combination with several new technologies such as Valvistor, Anti-Saturation, Meter-in and Meter-out Pressure Control. The valve is microprocessor controlled, programmable and communicates via a CAN-Bus. The valve could easily be specified with an interactive Windows based configuration software.

Development of a single pump load sensing hydraulic system for a military container handler. Harnischfeger Corporation was contracted by the US Government to build and supply a 14 ton lifting capability container handler (crane) that would self propel, fit into a Lockheed C-130 Hercules cargo aircraft and weigh under 25,000 lbs. Harnischfeger contracted Vickers, Inc. to aid in the design of the complete hydraulic system and supply the hydraulic hardware.