Control for oxygen producing apparatus

Claim 1

APPARATUS FOR LIQUEFYING AND SEPARATING COMPRESSED MIXED GASES, COMPRISING A HEAT EXCHANGER WHEREIN SAID MIXED GASES ARE PASSED IN HEAT EXCHANGE RELATION WITH A COLD FLUID, AN EXPANSION ENGINE CONNECTED TO SAID HEAT EXCHANGER TO RECEIVE AND EXPAND THE MIXED GASES, FRACTIONATING MEANS CONNECTED TO THE EXHAUST OF SAID ENGINE TO RECEIVE THE EXPANDED MIXED GASES, CONDUIT MEANS LEADING FROM SAID FRACTIONATING MEANS TO SAID HEAT EXCHANGER TO PROVIDE SAID COLD FLUID THERETO, A BYPASS LEADING FROM SAID EXHAUST OF SAID ENGINE TO SAID CONDUIT MEANS WHEREBY SAID EXPANDED MIXED GASES FLOW TO AND THROUGH SAID HEAT EXCHANGER IN HEAT EXCHANGE RELATION WITH SAID MIXED GASES, AND A THERMALLY ACTUATED CONTROL VALVE IN SAID BYPASS ACTUATED BY LIQUID FORMED IN SAID FRACTIONATING MEANS, WHEREBY SAID VALVE IS ACTUATED INTO CLASED POSITION BY THE TEMPERATURE OF SAID LIQUID TO PERMIT ALL OF SAID EXPANDED MIXED GASES TO FLOW INTO SAID FRACTIONATING MEANS.