Stone Mountain Technologies, Inc.

Christopher M Keinath

Michael Alan Garrabrant

Paul Glanville

Roger E Stout

Matthew C Blaylock

Paul E Glanville

An electronic expansion valve (EEV) is operated by a motor controlling a variable restriction valve in which a liquid refrigerant enters at a high pressure and exits at a reduced pressure. The motor controls the depth of a tapered needle which, as extended, penetrates multiple fixed orifices, aligned in series. Additional fixed orifices, downstream of the fully extended needle, provide further restriction and management of refrigerant flashing. Depending on the desired operating range, the following elements may be controlled: needle length, diameter, and taper; diameter, thickness, and relative elevation of each orifice; response and maximum torque provided by the motor; and geometry of the valve enclosed volume.

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Johnson City, TN, United States of America

Christopher M Keinath