An apparatus for shaping plastic preforms for providing plastic containers), having a plurality of shaping stations arranged on a movable carrier, wherein the shaping stations have blowing molds which accommodate the preforms and within which the preforms are shaped to provide the containers, and wherein the shaping stations each have charging devices which are movable relative to the preforms and which charge the preforms arranged in the molds with a flowable medium for expansion, and wherein the shaping stations have a valve arrangement which controls the feed of the medium to the preforms, with a clean chamber within which the shaping stations are conveyed with the charging devices, wherein the clean chamber is arranged against the surroundings by at least one wall. Flow connections for guiding the flowable medium are provided between the valve arrangements and the charging devices and the valve arrangements are arranged outside the clean chamber.