Abstract: The respiratory training device comprises a shell housing (1) with a detachable respiratory air channel (2) connected therewith, a mouthpiece (3), an air bag (5) and a control device (14). In the respiratory air channel (2) a valve configuration is installed and specifically a piston valve. This piston valve is equipped with a valve body, which is freely movable and does not have a fixed connection to the respiratory air channel (2). In the housing part (1) and/or in the housing of the valve configuration force-generating means are available, which retain the valve body in the sealing position and determine the necessary opening forces for the valve. All parts, which are in contact with respiratory air, can be removed and cleaned simply.