Injection device comprising at least one flexible diaphragm

An injection station for a forming and filling station for forming a preform into a container and filling the container using a pressurized liquid, the injection station comprising:

• a mold defining a molding cavity in a shape of the container to be produced, the mold being arranged to receive a preform, and
• an injection device comprising:
• a main housing comprising an inlet configured to be placed in fluidic communication with a pressurized liquid source, an outlet configured to be placed in fluidic communication with the preform placed in the mold and an injection chamber configured to receive and communicated the pressurized liquid between the inlet and the outlet,
• a closing body, movable relative to the outlet between a closed position and an opened position, in the closed position the closing body forming an annular seal about the outlet,
• a closing diaphragm attached at least to the closing body, the injection chamber being delimited at least by an inner surface of the closing diaphragm, the closing diaphragm having an outer surface extending outside the injection chamber and defining an outside area isolated from the injection chamber in a fluid tight manner,
• a bearing surface against which a supported portion of the outer surface of the closing diaphragm is applied, the bearing surface being defined by a part of the main housing and a part of the closing body,
• the closing diaphragm further comprising a free portion forming with the supported portion the whole outer surface of the closing diaphragm,
• wherein the bearing surface is arranged such that the surface of the free portion decreases when the closing body moves from the closed position to the opened position.