Blow molding apparatus

A blow molding apparatus for forming a container from a preform by injection of a pressurized liquid into the preform, the apparatus comprising:

• a blow nozzle defining an outlet from the apparatus for injection of the liquid into the preform;
• a filling head coupled to the blow nozzle, the filling head having an inner surface defining liquid supply channel extending through the filling head, the liquid supply channel being coaxial with the outlet of the blow nozzle, a liquid introduction channel also defined in the filling head and being coupled to the liquid supply channel, the liquid introduction channel being angled relative to the liquid supply channel;
• a seal body located within the liquid supply channel and moveable between a closed position where the seal body engages the blow nozzle and an open position where the seal body is disengaged from the blow nozzle;
• and
• a groove provided in the inner surface of the filling head at a location between the liquid introduction channel and the outlet.