This invention relates to connection of thin wall stainless steel tubes. Two tubes are put into flange inner holes separately, one procedure is to weld the two ends with flange with one end surface slot as that for inserting the ring seal the other procedure is that two ends are turned with vertical edges with full stainless steel inner expanding packing gland in between, composed of right and left taper seal tubes and a base with double seal loops in the middle. The former is to weld the flange on the port before mounting to ensure the port intensity and roundness and the expanding packing gland of the latter strengthens the intensity of the port of secure the seal result. |