SE366699

1333323 Rail vehicle air brake system KNORR-BREMSE GmbH 6 May 1971 [6 May 1970] 13S73/71 Heading F2F A rail vehicle braking system including a main air pipe 2a, driver's valve 21 and a relay valve 1 which monitors the pressure in the main air pipe and is controllable by the driver's valve 21 through a regulating pressure has an automatic filling surge arrangement which comprises a first chamber 50 on one side of a regulating piston 49 adapted to be at a control pressure, the first chamber 50 communicating with a second 51 chamber on the other side of the piston 49 and an actuating piston 43 having a chamber 44 on one side at control pressure and communicating with a chamber 45 on the other side of the piston, the chamber 45 being capable of being vented via the driver's valve so that the actuating piston acts on the regulating piston 49 to move it into a filling surge position against a biasing spring 62, in which position the chamber 51 is connected to a compartment 55 at a regulating pressure, the piston 49 being returned by the spring 62 when the regulating pressure is equal to the control pressure.