Pressurized refrigeration circulating system

Claim 1

IN A REFRIGERATING SYSTEM, IN COMBINATION, A CONDENSER, AN EVAPORATOR, A FEED LINE FOR SUPPLYING LIQUID REFRIGERANT UNDER PRESSURE TO SAID EVAPORATOR IN AN AMOUNT GREATER THAN THE EVAPORATOR IS CAPABLE OF EVAPORATING, SAID FEED LINE INCLUDING A RECEIVER AND SAID FEED LINE CONNECTING THE CONDENSER WITH THE RECEIVER, A SUCTION LINE FOR DRAWING OFF THE VAPORIZED AND LIQUID REFRIGERANT FROM THE EVAPORATOR, AN ACCUMULATOR IN THE SUCTION LINE FOR TRAPPING THE LIQUID REFRIGERANT PASSING THROUGH THE EVAPORATOR, LIQUID RETURN MEANS INCLUDING A RESERVOIR FOR RECEIVING AND TEMPORARILY STORING THE LIQUID REFRIGERANT FROM SAID ACCUMULATOR, A CONDUIT CONNECTING SAID RESERVOIR WITH THE RECEIVER, MEANS OPERABLE IN RESPONSE TO CHANGES IN THE LEVEL OF THE LIQUID IN THE RESERVOIR, VALVE MEANS CONTROLLED BY SAID LIQUID LEVEL RESPONSIVE MEANS FOR INTRODUCING REFRIGERANT FROM THE FEED LINE OF THE SYSTEM INTO THE SAID RESERVOIR TO FORCE THE LIQUID FROM THE RESERVOIR INTO THE RECEIVER FOR EVENTUAL DELIVERY TO THE EVAPORATOR, MEANS FOR CONTROLLING RECEIVER PRESSURE INCLUDING A DOWNSTREAM PRESSURE REGULATOR LOCATED IN THE FEED LINE IN ADVANCE OF THE RECEIVER, WHEREBY THE RECEIVER IS MAINTAINED AT A PRESSURE BELOW CONDENSER PRESSURE BUT ABOVE EVAPORATOR PRESSURE, AND CONDUIT MEANS HAVING CONNECTION WITH THE FEED LINE BETWEEN THE CONDENSER AND THE PRESSURE REGULATOR FOR DELIVERING LIQUID REFRIGERANT TO THE ACCUMULATOR.