Forming head with integrated seal pin/stretch rod and various sealing geometries

A hydraulic blow molding system for forming a container from a preform by injecting a liquid product into the preform thereby expanding the preform into the shape of the container, the hydraulic blow molding system comprising:

• a forming head including a nozzle body, the nozzle body defining a central passageway terminating in an exit orifice, the central passageway defining a central axis;
• a source of liquid product coupled to the forming head and in communication with the central passageway and the exit orifice;
• a mold assembly having interior surfaces cooperating to define a mold cavity in the shape of the plastic container;
• an integrated seal pin/stretch rod located within the forming head and being moveable between a closed position and an opened position, in the closed position a sealing portion of the integrated seal pin/stretch rod being in sealing engagement with a portion of the forming head so that the exit orifice is closed and the liquid product is prevented from being injected into the preform, in the opened position the sealing portion of the integrated seal pin/stretch rod being disengaged from the portion of the injection head so that the exit orifice is open and the liquid product injected into the preform.