Device of a blow-moulding apparatus

A valve unit of a device of a blow-moulding apparatus for moulding hollow bodies, the device comprising:

• a housing block with a through-bore for at least partially receiving a blowing nozzle of the blow-moulding apparatus which may connect to the hollow body,
• at least one valve with a movable piston and with a valve chamber,
• a first channel which runs in the housing block and which connects the valve chamber to the through-bore,
• a second channel which connects the valve chamber to an external line and
• a cover for fastening the valve to the housing block,
• wherein the valve connects the first channel and the second channel to one another and separates them from one another,
• wherein at least one of the following applies;
• the second channel runs at least partially in the cover;
• or
• at least one part of the valve chamber is arrange in the cover and surrounds the piston,
• wherein the valve unit comprises the cover and the movable piston of the at least one of the at least one valve,
• wherein the movable piston is releasably fastened in the cover,
• and wherein the valve unit is releasably connectable to the housing block as a unit.