Operation is fully automatic and mechanical, with activating force derived from natural machine action. During injection, the material flow and pressure force shut-off pin backwards, thereby overcoming spring tension through pin extension.

Material flows unrestricted into mould. As soon as injection pressure is released, the tension of the spring forces pin extension and thereby also shut-off pin forward, restricting material flow.

The tip is of reverse taper design; hence, residue material is ejected with the finished article, eliminating the possibility of cold slugs and strings.

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