From Plastics Wiki, free encyclopedia
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 buildâ€“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.