Apparatus for controlling the rate of flow of fluid material through an injection molding flow channel leading to a mold cavity, the apparatus comprising: a pin having a longitudinal length and a diameter slidably mounted in an aperture in a housing that is adapted for back and forth axial movement of...http://www.google.com/patents/US20070273060?utm_source=gb-gplus-sharePatent US20070273060 - INJECTION MOLDING VALVE FLOW CONTROL
