Valve gating

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Valve gating 1) A type of gate in which a pin is held in the gate or channel by spring tension. As the plunger comes for-ward, it compresses the plastic in the runner. When this pressure build–up is sufficient to overcome the spring tension, the pin is then pushed back (pulled) and the fast decompression of the plastic fills the cavity at extremely high speed. 2) A type of hot runner mold gating that uses hydraulic or pneumatic pressure to open and close the gate opening to the part.