US 9,810,460 B2
Reversible flow electric expansion valve
Stuart Means, Whitehouse, TX (US)
Assigned to Trane International Inc., Piscataway, NJ (US)
Filed by Stuart Means, Whitehouse, TX (US)
Filed on Oct. 19, 2011, as Appl. No. 13/276,824.
Prior Publication US 2013/0098071 A1, Apr. 25, 2013
Int. Cl. F25B 30/00 (2006.01); F16K 31/02 (2006.01); F25B 41/06 (2006.01)
CPC F25B 41/062 (2013.01) [F25B 2341/061 (2013.01); F25B 2341/0653 (2013.01); Y02B 30/72 (2013.01)] 17 Claims
OG exemplary drawing
 
13. A method of operating a heat pump HVAC system, comprising:
providing an electronically controlled expansion valve comprising a motor, an obturator movable by the motor, a removable seat movable by the motor, a complementary portion for selectively receiving the removable seat, and
a retraction rod extending from the obturator and through at least a portion of the removable seat, the retraction rod being slidably received through a retraction hole of the removable seat, and the removable seat being captured along the retraction rod between the obturator and a seat catch of the retraction rod, wherein the removable seat is selectively removable from the complementary portion in response to operation of the motor; and
locating the obturator relative to the removable seat to selectively allow operation of the electronically controlled expansion valve in at least one of a closed state with substantially no fluid flow through the valve, a metered state with fluid flow through the valve in a first direction, and an unmetered state with fluid flow through the valve in a first direction.