Miniature proportional valves are based on shape memory wire
10 June 2009
A new type of miniature proportional valve which helps designers to meet the familiar objectives of ‘make it smaller, lighter and more energy efficient’, has been developed by miniature component specialist, Lee Products. Unlike most typical miniature solenoid valves, the Lee product uses shape memory wire technology to vary flow and provide actuation, instead of a spring. When a current is applied the shape memory alloy wire heats up in the valve and changes shape, causing deformation and resuling in the valve opening up in proportion to the applied current.
This innovative design eliminates the need for a magnet, coil wire, or steel armature, so it’s smaller and lighter. These characteristics will be especially appreciated by designers of portable, hand-held, battery powered instruments such as gas detectors used in OEM, medical, laboratory and other similar applications.
The 2-way, NC configuration valves weigh just 1.2 grams, operate from a1.5 Vdc supply and draw a current of 600 mA (max). Materials of construction include elastomer FKM with wetted materials including Polycarbonate, brass, Elastomer, PEEK, 316 SS, Flexinol and Epoxy.
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