Refrigerant cycle with three-way service valve for...

Details Refrigerant cycle with three-way service valve for... Refrigerant cycle with three-way service valve for...

2008-05-13

2008-05-13

Norman, Marc (Department: 3744)

Refrigeration

Processes

Assembling, charging, or repairing of refrigeration producer

C062S149000, C062S174000, C062S292000, C062S324400

Reexamination Certificate

active

07370483

ABSTRACT:
A refrigerant cycle is provided with a single three-way service valve that is utilized for draining and adding refrigerant. In the prior art, a second two-way valve was used in combination with the three-way valve. The present invention simply drains the refrigerant, and does not need to return the refrigerant. The present invention is particularly well suited for use with an environmentally benign refrigerant such as CO2.

REFERENCES:
patent: 4175400 (1979-11-01), Edwards et al.
patent: 4644973 (1987-02-01), Itoh et al.
patent: 5167126 (1992-12-01), Cartwright
patent: 5377493 (1995-01-01), Friedland
patent: 7096679 (2006-08-01), Manole
patent: 2003/0116740 (2003-06-01), Schroeder et al.
patent: 2003/0213516 (2003-11-01), Hirota et al.
patent: 2003049960 (2003-02-01), None
International Search Report and Written Opinion dated Sep. 27, 2007.

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