Apparatus for the expansion of containers

A blow valve for changing a flow rate of an operating working gas in a gas communication path, the blow valve comprising:

• a blow valve body;
• an environmentally controlled first receiving space constructed and arranged in the blow valve body and having at least one entry opening and at least one exit opening for receiving and conveying gas;
• a second receiving space constructed and arranged in the blow valve body and arranged for guiding a pressure distribution member;
• and,
• a sealing component configured to substantially prevent an exchange of gas between the first receiving space and the second receiving space, the sealing component arranged between the first receiving space and the second receiving space, wherein the sealing component has a stationary portion that is fixed to the blow valve body and a movable portion arranged for changing the flow rate of gas, and wherein the pressure distribution member is at least partially surrounded by the sealing component and is coupled to the movable portion so that the movable portion and the pressure distribution member move together, wherein the movable portion forms a closure face capable of being brought into contact with at least one of the exit opening and entry opening so as to close the at least one of the exit opening and entry opening, wherein the closure face is formed on a first portion of the movable portion and is fixed to the pressure distribution member, wherein the pressure distribution member is a piston head, wherein a second portion of the movable portion is movable with respect to the piston head and is formed between the first portion of the movable portion and the stationary portion of the sealing component, and wherein the second portion of the movable portion is designed in the manner of a bellows which has at least one fold forming a bend.