4425

The 4425 has the following features including Proportional Response;Low Power;Fast Response;Miniature Size;25 psig Operating Pressure;PC Board Mountable.

The Model 4425 is the world's first commercially available silicon microvalve. This normally closed microvalve offers proportional control of gas flows in the range of 0-150 cc/min with an operating pressure range of 25 psig.Batch fabricated using state-of-the-art silicon micromachining technology, these microvalves consist of a centrally bossed silicon diaphragm mated to an etched silicon valve body. An aluminum film of 4425 is deposited on the diaphragm to form the bimetallic actuator. By varying the electrical power dissipated in resistors implanted in the diaphragm, and thus the temperature of the actuator, the thermal expansion difference between silicon and metal results in the controlled displacement of the central boss away from the valve seat.The valve chip is then attached to a ceramic substrate,electrical connections are made, and plastic caps are bonded to each side of the ceramic to provide the gas connections. Filters 4425 are included inside the package to keep particles from entering the valve chip, though filtered,clean gas is recommended for use with themicrovalves.The package can be mounted to a PC board, panel mounted, or stacked for multi-valve applications.In addition to a family of standard products, IC Sensors 4425 can provide customized solutions including multi-valve packages and valves with different characteristics. Please contact IC Sensors 4425 to discuss your specific requirements.

The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for any use that includes fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for any use where chance of failure is intolerable (i.e., submersible repeater and artificial satellite).