Sequential Valve Gate Technology (SVG), a core innovation in modern hot runner injection molding, is particularly suited for molding large, complex thin-walled automotive components such as bumpers, door panels, instrument panels, fenders, and more. As a leading injection mold supplier, we have deep expertise in this technology, enabling our clients to achieve high-quality, low-defect production.
The sequential valve gate system uses a precision controller (such as a timing valve controller) to independently control the opening and closing sequence of multiple needle-valve hot runner gates — instead of opening all gates simultaneously. The melt begins filling from a central or side gate and progressively activates subsequent gates in a cascaded sequence (e.g., from hot nozzle 1 to nozzle 5). This controlled flow front advancement effectively eliminates or significantly reduces visible weld lines that typically occur with conventional multi-gate filling, or precisely relocates weld lines to non-visible surfaces. At the same time, it lowers filling pressure, minimizes warpage, internal stress, and air traps, ensuring excellent surface finish, dimensional stability, and superior mechanical properties for large parts.
This technology dramatically shortens cycle times, reduces energy consumption, and improves mold balance — making it ideal for lightweight, large-scale automotive components and now an industry standard.