Valve inserts for valve bags

Claim 1

A VALVE BAG HAVING AN END WHICH INCLUDES TWO CONVENTIONALLY FOLDED CORNERS, EACH OF WHICH INCLUDES AN END FLAP, ONE OF SAID CORNERS BEING COMPLETELY SEALED AND THE OTHER CORNER SERVING TO MOUNT A FILLING VALVE, SAID VALVE COMPRISING A FLATTENED OPEN-ENDED TUBE FORMED OF THIN FLEXIBLE MATERIAL, A RECTANGULAR STIFFENING STRIP SUPERIMPOSED ON ONE OF THE FLATTENED SIDES OF SAID TUBE, SAID STIFFENING STRIP BEING FORMED OF MATERIAL WHICH, THOUGH FLEXIBLE, IS APPRECIABLY STIFFER THAN THE MATERIAL OF SAID TUBE, SAID STIFFENING STRIP EXTENDING THE FULL LENGTH OF SAID TUBE, SAID STIFFENING STRIP AND TUBE BOTH EXTENDING INWARDLY INTO THE BAG A GREATER DISTANCE THAN THE INNER EXTREMITY OF THE BAG END FLAP IN THE CORNER WHERE SAID VALVE IS MOUNTED, THE BOTTOM OF SAID STRIP BEING SECURED TO SAID TUBE ALONG A FIRST LINE EXTENDING TRANSVERSELY ACROSS THE BOTTOM OF SAID STRIP AT THE END THEREOF NEAREST THE VALVE CORNER OF THE BAG AND JOINING SAID END TO THE ADJACENT SIDE OF THE FLATTENED TUBE ALONG THE ADJACENT OPEN END THEREOF, THE OPPOSITE ENDS OF SAID STIFFENING STRIP AND TUBE BEING SECURED TO ONE ANOTHER ONLY CENTRALLY OF THE BOTTOM OF SAID STRIP AT THE INNER END THEREOF.