Capacity controlled refrigeration system

Claim 1

A REFRIGERATION SYSTEM COMPRISING A REFRIGERANT COMPRESSOR MEANS, A REFRIGERANT CONDENSER, A REFRIGERANT THROTTLING MEANS AND A REFRIGERANT EVAPORATOR CONNECTED RESPECTIVELY IN SERIES, SAID COMPRESSOR MEANS INCLUDING FIRST AND SECOND COMPRESSION CYLINDERS EACH INCLUDING A MOVABLE PISTON THEREIN, EACH OF SAID CYLINDERS HAVING ASSOCIATED THEREWITH A SUCTION PORT AND A DISCHARGE PORT PROVIDED RESPECTIVELY WITH A SUCTION VALVE AND A DISCHARGE VALVE, A SUCTION PASSAGEWAY EXTENDING TO SAID SUCTION PORTS FROM SAID EVAPORATOR, A FIRST DISCHARGE PASSAGEWAY EXTENDING FROM THE DISCHARGE PORT OF SAID FIRST CYLINDER TO SAID CONDENSER, A SECOND DISCHARGE PASSAGEWAY EXTENDING FROM THE DISCHARGE PORT OF SAID SECOND CYLINDER AND COMMUNICATING WITH SAID FIRST DISCHARGE PASSAGEWAY, A CHECK VALVE MEANS DISPOSED IN SAID SECOND DISCHARGE PASSAGEWAY SUBSTANTIALLY LIMITING FLOW THERETHROUGH TO A FLOW DIRECTION AWAY FROM SAID DISCHARGE PORT OF SAID SECOND CYLINDER, A BYPASS PASSAGEWAY COMMUNICATING WITH SAID DISCHARGE PORT OF SAID SECOND CYLINDER, UPSTREAM OF SAID CHECK VALVE MEANS AND EXTENDING TO SAID SUCTION PASSAGEWAY, A BYPASS UNLOADER VALVE MEANS DISPOSED IN SAID BYPASS PASSAGEWAY FOR CONTROLLING THE FLOW OF FLUID FROM SAID DISCHARGE PORT OF SAID SECOND CYLINDER THROUGH SAID BYPASS PASSAGEWAY TO SAID SUCTION PASSAGEWAY, SAID VALVE MEAN INCLUDING A VALVE SEAT, A VALVE DISPOSED ON THE DOWNSTREAM SIDE OF SAID SEAT IN COOPERATIVE RELATIONSHIP WITH SAID SEAT, MEANS FORMING A CHAMBER, A MOVABLE PARTITION DIVIDING SAID CHAMBER INTO FIRST AND SECOND PORTIONS, CONNECTING MEANS OPERATIVELY CONNECTING SAID PARTITION TO SAID VALVE WHEREBY MOVEMENT OF SAID PARTITION TOWARD SAID FIRST PORTION OF SAID CHAMBER MOVES SAID VALVE TOWARD SAID SEAT AND MOVEMENT OF SAID VALVE AWAY FROM SAID SEAT MOVES SAID PARTITION TOWARD SAID SECOND PORTION OF SAID CHAMBER, MEANS COMMUNICATING SAID SECOND PORTION OF SAID CHAMBER WITH SAID FIRST DISCHARGE PASSAGEWAY ON THE DOWNSTREAM SIDE OF SAID CHECK VALVE MEANS, AND SELECTOR MEANS FOR SELECTIVELY APPLYING FIRST CYLINDER DISCHARGE PRESSURE AND SUCTION PRESSURE TO SAID FIRST PORTION OF SAID CHAMBER WHEREBY SAID BYPASS VALVE IS RESPECTIVELY OPENED AND CLOSED.