Rotary hot gas valve

Claim 1

A HOT GAS VALVE OF THE CHARACTER DESCRIBED, COMPRISING; A CLOSED HOUSING HAVING A FLUID INLET AND OUTLET MEANS, AND EXTERNAL ATTACHMENT MEANS ADAPTED TO COUPLE THE HOUSING TO A ROCKET MOTOR IN A BY-PASS LINE EXTENDING BETWEEN THE COMBUSTION CHAMBER AND THE EXHAUST NOZZLE THEREOF IN A POSITIONTO CONVEY HOT COMBUSTION GASES THEREBETWEEN; A TUBULAR LINER OF REFRACTORY MATERIAL ROTATABLY DISPOSED WITHIN SAID HOUSING ON THE LONGITUDINAL AXIS OF SAID BY-PASS LINE, SAID LINER HAVG A GENERALLY AXIAL, NORMALLY-OPEN INLET END ALIGNED WITH SAID FLUID INLET OF THE HOUSING AND WITH SAID BY-PASS LINE, AND HAVING A NON-AXIAL OUTLET OPENING SELECTIVELY ALIGNABLE WITH SAID HOUSING OUTLET BY ROTATION OF THE LINER; A SURROUND INSULATING SHEATH FIXED DISPOSED ABOUT SAID LINER WITHIN SAID HOUSING; BEARING MEANS ROTATABLY SUPPORTING SAID LINER ADJACENT THE INLET END THEREOF; ROTARY SEALING MEANS FOR SAID BEARING MEANS COMPRISING O-RINGS SPACED APART LONGITUDINALLY ON OPPOSITE SIDES OF SAID BEARING MEANS; MEANS DEFINING A NARROW CHAMBER SURROUNDING SAID LINER BEYOND SAID INSULATING SHEATH AND IN OPEN COMMUNICATION AT ALL TIMES WITH THE RESPECTIVE FLUID OUTLETS OF BOTH SAID HOUSING AND SAID LINER; WHEREBY THERE IS A CONSTANT LEAKAGE OF HOT GAS THROUGH SAID CHAMBER WHEN THE VALVE IS CLOSED; AN AXIAL SPINDLE FIXED TO AND PROJECTING FROM THE END OF SAID LINER REMOTE FROM SAID INLET END, SAID SPINDLE BEING SEPARATED FROM SAID LINER BY AN INSULATING LAYER; AN ANNULAR THRUST BEARING MOUNTED ON SAID SPINDLE; AND OPERATIVE GEAR AND DRIVE MEANS ADAPTED PROGRESSIVELY TO ALIGN AND DISALIGN WITH THE RESPECTIVE LINER AND HOUSING OUTLETS BY POINT ROTATION OF SAID SPINDLE AND CONNECTED LINER.