An expansion valve for modifying the flow of a refrigerant fluid to provide reliable control of a refrigeration system includes a channel for conveying the refrigerant fluid. The channel has an inlet for accepting the refrigerant fluid and an outlet for exhausting the refrigerant fluid. A heating element...http://www.google.com.au/patents/US6510700?utm_source=gb-gplus-sharePatent US6510700 - Electrical expansion valve
