Overflow valve and compressed air device for motor vehicles

The discharge valve (1) comprises an inlet (2) and an outlet (3) for the compressed air, where a valve unit (8) lies on a valve seat (7) in the closed position of the discharge valve. A fluid communicating pressure balancing space (20) is provided with the outlet on a valve piston (15) facing side of the valve unit. An independent claim is also included for a compressed air device with a compressed air pipe.