With respect to common hot runner system, valve gate hot runner system has higher technical content. The common main problem is valve gate hot runner needle motion not smooth.

When appear this phenomenon, firstly, engineer should check whether the pressure enough or not. Also need check gas route and tightness is good. Secondly, check concentric of cylinder, manifold and nozzle. if not, needle won’t move smoothly. Thirdly, examine material leakage problem between valve gate needle and guide bushing. If the other is without problem, check the machining sizes. At least, injection molding machine signal connection incorrect and sprue bigger problem will cause this problem.

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