`
`Claim 1
`
`A two stage freezing apparatus having a high temperature side refrigerating cycle
`
`constitute of a high temperature side compressor, a condenser, an expansion valve and a
`
`cascade condenser, a low temperature side refrigerating cycle constitute of a low
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`temperature side compressor, said cascade condenser, an expansion valve and an
`
`evaporator, and a expansion tank connected to the low pressure side path of said low
`
`temperature side refrigerating cycle via a capillary tube comprising;
`
`a check valve connected in parallel to the capillary tube, the check valve only
`
`allows the refrigerant flow to the expansion tank.
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