Patent ID: 7878023
Filing Date: 2011-02-01
Classification: F04B,F25B

Abstract:
1. CO 2 -Refrigeration circuit ( 1 , 1 ′) for circulating a CO 2 -refrigerant in a predetermined flow direction through at least one functionally disconnectable component, the refrigeration circuit comprising in flow direction an expansion device (b, b′, 26 , 26 ′, 33 ), an evaporator, a compressor ( 2 , 2 ′, 29 , 36 ) and a heat-rejecting heat exchanger ( 6 , 20 ), wherein an upstream-side shut-off valve is provided upstream of the component and a downstream-side shut-off valve is provided downstream of the disconnectable component, at least one of these shut-off valves being a non-return valve (a, c, 3 , 3 ′, 4 , 4 ′, 25 , 27 , 32 , 34 ) which is adapted to allow flow back of the CO 2 -refrigerant into an adjacent portion of the refrigeration circuit, if pressure within the functionally disconnected component increases above the pressure in the portion of the refrigeration circuit ( 1 , 1 ′).