Pivoting valve device, especially an amplifier

A valve means comprising a housing which contains a movable switching element having two closure portions each associated with an opening of a fluid duct and engaged at two spaced points by two actuating diaphragms, which are able to be subject to fluid so that the switching element is able to be positioned in at least two switching positions in which the respectively one duct opening is closed and the respectively other duct opening is open, the switching element being constituted by a switching rocking member adapted to perform a pivotal movement on switching over, whose rocking arms placed on either side of a pivotal portion are engaged respectively by one of the actuating diaphragms and on which respectively one of the closure portions is provided, the two first and second fluid ducts associated with the closure portions and furthermore a third fluid duct communicating with a common connecting chamber, the third fluid duct being connected, dependent on the switching position of the switching rocker member, by way of the connecting chamber with the first or with the second fluid duct, the third fluid duct opening into the connecting chamber between the two other fluid ducts and in this respect opposite to the pivotal portion of the switching rocker member adjacent to a bottom longitudinal side of the switching rocker member and in that a pivotal bearing means for the switching rocker member is only located adjacent to a top longitudinal side of the switching rocker member.