Movable expansion valve

Details Movable expansion valve Movable expansion valve

1975-06-23

1976-11-23

O'Dea, William F.

Refrigeration

Reversible, i.e., heat pump

With product treatment

62527, 1375133, 138 45, F25B 1300

Patent

active

039928985

ABSTRACT:
An expansion device for use in a reversible vapor compression refrigeration cycle for producing, upon demand, either heating or cooling. Two devices are mounted in opposed relationship in a supply line carrying refrigerant between a first heat exchanger and a second heat exchanger. Each expansion device includes a body having a flow passage therein opening into an expanded chamber. A free-floating piston is slidably mounted in the chamber and is moved to a first position when refrigerant is passed through the line in a first direction and to a second position when the direction of flow is reversed. A centrally located metering port passes through the piston while fluted channels are formed in its outer periphery. When in the first position, the fluted channels are closed against one side wall of the chamber and refrigerant is throttled through the metering port from the high pressure exchanger (condenser) into the low pressure exchanger (evaporator). Reversing the direction of refrigerant flow causes the piston to be moved into the second position wherein the fluted channels are opened to the supply line to allow an unrestricted flow of refrigerant about the piston.

REFERENCES:
patent: 2550373 (1951-04-01), Ortloff et al.
patent: 3482415 (1969-12-01), Trask

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