Suitable for large-scale parts or complex shape parts.
There is a pin in the nozzle and drive by pneumatic or hydraulic to open or close the nozzle gate. When the valve pin open / close can control the melt filling. Especially for the big gate design, the valve pin will seal the gate after packing process to prevent the stringing and get the unapparent gate mark.
For the multi-gate mold design, using the sequence control can eliminate the weld line problem.