Proportional Valve Saves Space, Weight And Power

Lee Products has introduced a miniature proportional valve that helps designers to make smaller, lighter and more energy-efficient products. Compared with traditional solenoid-type proportional valves, the Lee proportional valve saves space, weight and power consumption in analytical machines.

The Lee valve uses shape-memory wire technology to vary flow and provide actuation, as opposed to a spring. When a current is applied, the shape-memory alloy-wire heats up in the valve and changes shape; this causes deformation and results in the valve opening up in proportion to the current applied. This eliminates the need for a magnet, coil wire or steel armature; these are typically used in traditional miniature solenoid valves.

This makes the design suitable for designers of portable, hand-held battery-powered instruments such as gas detectors used in OEM, medical, laboratory and similar applications, including: mass flow controllers, blood-pressure cuff monitors, ventilators and oxygen concentrators. These Lee proportional-valves are suitable for use with non-corrosive and non-flammable air or gases. These are two-way NC configuration valves.

They weigh 1.2g, have a maximum power consumption of 1.5V DC (battery powered) and a current draw of 600mA (max). They have a flow capacity of 8 SLPM at 15psig, operating pressure of 15psig and operating temperature-range of 40 to 105F (4.4 to 40.46C). The valves are constructed from elastomer FKM with wetted materials, including polycarbonate, brass, elastomer, PEEK, 316 SS, Flexinol and epoxy.

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