JDF-408 series heavy Water jet loom combines the advancement of ZW405, a new Water jet loom that comprehensively improves the whole machine. The design of the whole machine frame is comprehensively enlarged and the support area of the beam is expanded, which greatly improves the seismic performance and has good stability. The increase of the let-off cross-sectional area improves the ability of Loom to adapt to high latitude and high weight fabrics, and is applied to the production of medium and high-grade fabrics. This model can be equipped with mechanical weft storage system, electronic single-jet, double-jet, electronic triple-jet, four-jet and six-jet electronic weft storage system, and optional trim opening, cam opening device and dobby opening device.