Gaseous flow reversal valve

Claim 1

MEANS FOR CHANGING AND CONTROLLING THE DIRECTION OF GAS FLOW IN THE FLUES OF A REGENERATIVE FURNACE, SAID MEANS COMPRISING A FIRST HOUSING ENCLOSING TWO SUBSTANTIALLY EQUAL CHAMBERS, EACH OF SAID CHAMBERS ADAPTED TO BE PLACED IN COMMUNICATION AT ITS LOWER END WITH ONE OF SAID FLUES AND TERMINATING AT ITS UPPER END IN AN EXHAUST PORT, SAID EXHAUST PORTS IN COMMUNICATION IWTH A SECOND HOUSING ENCLOSING AIR EJECTOR MEANS, SAID AIR EJECTOR MEANS IN TURN IN COMMUNICATIION AT ITS UPPER END WITH A COMMON EXHAUST STACK, A COMBUSTION AIR DUCT HAVING AN INLET POSITIONED INTERMEDIATE SAID EXHAUST PORTS, A SLIDE VALVE POSITIONED WITHIN SAID SECOND HOUSING BETWEEN SAID EXHAUST PORTS AND SAID COMMON EXHAUST STACK FOR MOVEMENT FROM A POSITION COVERING SAID INLET AND ONE OF SAID EXHAUST PORTS TO A POSITION COVERING SAID INLET AND SAID OTHER EXHAUST PORT, THE UNCOVERED EXHAUST PORT REMAINING IN COMMUNICATION WITH SAID COMMON EXHAUST PORT REMAINING IN COMMUNIACTING AS MEANS FOR CONNECTING THE EXHAUST PORT OVER WHICH IT IS POSITIONED TO SAID AIR INLET, AND MEANS FOR PASSING AIR THROUGH SAID AIR EJECTOR MEANS IN ORDER TO COOL SAID SECOND HOUSING AND INDIRECTLY TO COOL THE SLIDE VALVE CONTAINED THEREIN WHILE INDUCING AN UPDRAFT IN SAID COMMON EXHAUST STACK.