The valve gate adds a valve rod to the hot runner gate. The valve can be activated to close the gate just before material near the gate solidifies. This allows a larger gate diameter and smoothes over the gate scar. Since the valve rod controls the packing cycle, better control of the packing cycle tis maintained with more consistent quality.
Pros: these valve gates typically allow for shorter cycle times in addition to better part surface at the gate location. This is a preferred method for thin-wall parts, foam and gas assist injection
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