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.

Comments

Post a Comment

Popular posts from this blog

What is Class I Division 2?

Image
A Class I Division 2 is a location: (1) In which volatile flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are handled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containers or closed systems from which they can escape only in case of accidental rupture or breakdown of such containers or systems or in case of abnormal operation of equipment, or (2) In which ignitable concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are normally prevented by positive mechanical ventilation, and which might become hazardous through failure or abnormal operation of the ventilating equipment. Class I Division 2 Classification Class I Division 2 refers to the ANSI/ISA 12.12.01 standard. This standard was previously UL1604 until UL recommended the newer ANSI/ISA standard be used and that all hazardous location products be certified under this standa...
Read more

FUSE SIZING CONSIDERATIONS FOR HIGHER EFFICIENCY MOTORS

Image
When selecting the proper fuse for short circuit protection in motor starting applications, it is important to not only ensure that the fuse will not nuisance open during motor start up times, but also that the fuse will coordinate as required with overload relays. When sizing fuses between 125% and 150% of the motor nameplate current, several advantages, including ease of coordination with an overload device, a smaller disconnect, and increased short circuit protection from a lower fuse rating, can be achieved. However, if sizing at this level prevents the motor from starting, it may then be necessary to increase the fuse ampere rating and it then becomes important to know the NEC sizing limitations. As of June 1, 2016, the US Department of Energy has mandated that newly manufactured electric motors will need to meet NEMA Premium® efficiency standards. As motor efficiencies increase, motor locked rotor currents can also be expected to increase. In addition to this, with across-the-lin...
Read more

7/8 16UN Connectors that Provide 600 Volts and 15 Amps

TURCK announces new A-Size 3 and 4-pin 7/8 16UN powerfast™ connectors that provide up to 600 Volts and 15 Amps of power. These IP67 rated connectors provide a modular wiring system designed to handle high current applications for machine power distribution, while providing resistance to vibration commonly associated with conveyors, motors and material handling applications. The cordsets are available with a tray rated, exposed run PVC flexlife ® cable, with or without STOOW rating, and 14 AWG wires that allow you to replace hard wiring with a robust, quick disconnect system that saves the time and money spent installing a conduit system. The A-Size powerfast line offers male and female, straight connectors, standard and custom lengths, and pigtails or extensions. To make the system complete, fully encapsulated mating receptacles, with 1/2”-14 NPT mounting threads are available.
Read more