Patent ID: 6637722
Filing Date: 2003-10-28
Classification: B60T,F15C,F16K

Abstract:
A microvalve device for controlling fluid flow comprising:a body having a chamber, a first pilot port, and a second pilot port formed therein, said pilot ports being in fluid communication with said chamber and being adapted for connection with one of a plurality of fluid sources; a first microvalve, said first microvalve being a micro-machined pilot valve formed from a semi-conducting material and movably disposed in said chamber and supported by said body for fully opening and at least partially closing said first and second pilot ports; an actuator operably coupled to said pilot valve for moving said pilot valve; and a second microvalve, said second microvalve being a pilot operated microvalve formed from a semi-conducting material and movably disposed in said chamber for movement between a first position and a second position, whereby positioning of said second microvalve is accomplished by positioning said pilot valve.