GB123709A - Improvements relating to Fluid Pressure Braking Apparatus. - Google Patents

Abstract

123,709. Turner, W. V. Feb. 23, 1918, [Convention date]. Fluid - pressure. - A single train wire is used for controlling both the application and release valves of an electropneumatic brake, one or other of the valves being included in the circuit according to the direction of the current as by means of a polarized relay. The equipment shown comprises a triple valve 5 with train-pipe, auxiliary reservoir, and brake cylinder connexions 3, 6, 16, An application valve 13 controls a passage 15, 16 connecting the piston chamber 2 with the brake cylinder and a release valve 12 together with the slide valve 7 controls the brake cylinder exhaust passage 31 with port 11. A polarized relay 17 is connected across the train-wire 23 and the return wire 24 or earth if a return wire is dispersed with. One terminal of both the valves 12, 13 is connected by the wire 23<1> to the train-wire 23 and the armature 18 of the relay 17 according to its position connects the other terminal of one valve or the other through the wires 28, 30 and contacts 25, 26, 27, 29 to the return wire 24. Normally both valves are de-energizecl so that the valve 13 is closed and the valve 12 is open to connect the brake cylinder tc exhaust through the slide-valve cavity 32 and passage 31. To apply the brake, the current is sent through the train wires in the direction which causes the valve 13 to be energized. The piston chamber 2 and train-pipe 3 are thereby vented to the brake cylinder and the triple valve is moved to connect the auxiliary reservoir to the brake cylinder. To hold the brakes applied, the current is reversed thereby closing both of the valves 12, 13. The re-charging of the train-pipe from the head-end of the train then effects the return ot the triple valve to cut off the auxiliary reservoir from the brake cylinder and the closing of the valve 12 prevents the exhaust of the cylinder through the cavity 32 and passage 31.