A valve arrangement of a blow-moulding machine, particularly of a stretch-blowing machine, for pneumatically switching the supply of blowing air in a blow-moulding process, wherein the valve arrangement comprises a main valve with a switching piston that is guided in a valve housing and can be displaced relative to the valve housing between a first position, in which the main valve is closed, and a second position, in which the main valve is open, and wherein the switching piston comprises a control surface for control air that faces a control chamber of the valve housing and is designed for transmitting a control force exerted by the control air acting in the direction of the first position onto the switching piston, wherein at least one bore (21; 27, 28) that fluidically connects a control air switching chamber to the control chamber and makes it possible to introduce control air from the control air switching chamber into the control chamber in order to close the main valve, as well as to vent the control chamber via the control air switching chamber when the main valve is opened, wherein control air can be supplied to the control air switching chamber via a control air bore leading into the control air switching chamber, and wherein a venting bore leading into the control air switching chamber is provided and makes it possible to vent the control chamber when the main valve is opened, characterized in that a closing element is provided, which is guided in the control air switching chamber, wherein it can be displaced relative to the control air switching chamber between a first position, in which the control air bore leading into the control air switching chamber is closed by the closing element, and a second position, in which the venting bore leading into the control air switching chamber is closed by the closing element, in that the at least one bore is arranged in such a way that it is neither covered and closed by the closing element in the first position nor in the second position of the closing element, and in that the closing element is arranged between the control air bore and the at least one bore in its first position, as well as in its second position, and designed in such a way that the control air introduced into the control air switching chamber through the control air bore can pass through the closing element in the second position of the closing element. in that a closing element is provided, which is guided in the control air switching chamber, wherein it can be displaced relative to the control air switching chamber between a first position, in which the control air bore leading into the control air switching chamber is closed by the closing element, and a second position, in which the venting bore leading into the control air switching chamber is closed by the closing element, in that the at least one bore is arranged in such a way that it is neither covered and closed by the closing element in the first position nor in the second position of the closing element, and in that the closing element is arranged between the control air bore and the at least one bore in its first position, as well as in its second position, and designed in such a way that the control air introduced into the control air switching chamber through the control air bore can pass through the closing element in the second position of the closing element.