• “Benefits of Using a High Flow Proportional Control Valve” is a Parker Hannifin (Precision Fluidics Division) white paper in which Parker engineer Jonathan DeSousa discusses achieving high flow in miniature proportional valves while keeping size, power and cost demands to a minimum. Miniaturization in markets such as medical, are driving changes to proportional valve development. As a result, Parker has released the new VSO-MAX high flow proportional valve, which incorporates pressure balancing technology.

Parker Hannifin, Precision Fluidics, 26 Clinton Drive Unit 103, Hollis NH, 03049, (603) 595-1500

• “Development of Highly Reliable Multilayer Piezo Actuators and Lifetime Tests Under DC and AC Operating Conditions” is a white paper that describes the development and lifetime tests of ceramic encapsulated actuators under ac and dc operation conditions. The actuators are compared to polymer-coated piezoceramic actuators in long-term tests. Equations and graphs for lifetime calculation under different operational and environmental conditions and special internal electrode designs for stress reduction are discussed.

PI (Physik Instrumente) Ceramic,16 Albert St, Auburn, MA 01501, (508) 832-3456

• “Selecting the Right Cable System for Your Environment”, covers the electrical, mechanical, environmental, and application- specific constraints that will affect cable performance. The paper presents a systematic approach that design engineer can follow to ensure that a cable system will provide reliable performance in demanding environments and missioncritical applications.

W.L. Gore & Associates, Inc, 555 Paper Mill Road, Newark, DE 19711, (410) 506-7787

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