Abstract: A jet tube assembly for a jet tube sheet dryer comprises a jet tube which is generally rectangular in cross section and tapers from a large, air-delivery end to a small end. A rod is attached to the tube at the small end thereof in a manner such as not to block the small end of the tube and to project beyond the small end of the tube substantially in alignment with the longitudinal axis of the tube. A closure member is formed with an aperture so that it can fit over the rod and move relative thereto between a first position, in which the small end of the tube is substantially blocked, and a second position in which a substantial portion of the cross sectional area of the tube at its small end is unobstructed by the closure member.

Abstract: A jet tube dryer retainer system for adapting an existing jet tube dryer of the type using flanged jet tubes manufactured by Coe Manufacturing Co. to receive and retain flangeless replacement jet tubes in such a manner as to allow rapid removal and reinstallation of the replacement jet tubes, permit longitudinal expansion of the replacement jet tubes, and decrease the likelihood of future warpage and misalignment of the replacement jet tubes. Structural members for supporting the replacement jet tubes and strengthening the jet tube dryer frame are welded to the dryer frame at the air-delivery end and chain-drive end of each dryer section. A mounting post locates the narrow, closed end of the respective replacement jet tubes relative to the plane of the respective dryer decks and maintains the replacement tubes in a position which is fixed laterally and vertically while allowing slight longitudinal movement of the narrow closed end of the tube.