Brake trains

The density of the brake line in the freight trains used to determine how and in passenger, ie, by lowering the line pressure within 1 min. This value should not have been more than 0.2 kgf/cm2. After covering a combined valve and pressure equalization along the highway needed to measure how much lower the pressure in the line for 1 min. This decrease in pressure occurred over the entire volume braking network, including spare tanks. For example, if the length of the freight train 220 axes (55 four-car) the amount of inhibitory network is 5720 liters (26 liters per axis), including the 4290 l have spare tanks. With diffuser № 219 and 292 passenger coaches and a number of 320 and 135 trucks have air leakage and pressure reduction occurring in route, and in the auxiliary reservoir, since the latter are reported to the trunk.

With the use of air distributors № 270, 483 when checking the density of the line indicated by the volume of spare tanks are disconnected from the main line check valve. Reduce the pressure only occurs in the brake line, and the cutoff of the working chambers, which amount to about one fifth of the volume of all brake network. Leaks also air in the main case in the United line. Therefore, in the same brain, determined by the quantity of compressed air, reducing the line pressure at diffuser № 270 would be five times greater than in the diffuser № 320 and 135, ie, 1.0 kgf/cm2 in 1 minute, instead of 0,2 kgf/cm2.

Currently, freight cars are equipped mainly diffuser № 270, 483. In the case of the overlap of the combined crane at the maximum allowable air leakage inevitably occurs inhibition of the train. Braked with a long freight train and the pressure difference contributes to the head and tail parts of the main duct. For this reason, and has changed the method of checking the density of the brake line for freight trains.

The density of the brake line to freight trains on the estimated time of pressure drop in the main reservoir of the locomotive at 0.5 kgf/cm2. Time is dependent on the length of the highway and the volume of the main reservoirs and is given in the Regulations TST-TSV-TSNII/3969 in tabular form.

For every 1000 liters of major reservoirs smallest allowable time to reduce the pressure at 0.5 kg/cm2, depending on the length of the composition: up to 100 axes - 50, 101 - 150 -35 with axes, axes 151-200 - 25 from 201, - 250 axles - 22 c, 251-300 axles - 20, 301-350 axles - 17,, 351-400 axles - 15,, 401-450 axles - 13 s, 451 - 480 axles - 11s. With a large volume of main tank standard time increases proportionally. When testing density with a charging pressure of 6,0-6,2 kg/cm2 standard time reduced by 20%.

Check-in time reduce the pressure in the main reservoirs 0,5 kgf/cm2 produce after switching off compressor pressure regulator and the subsequent reduction of pressure on the 0,4 - 0,5 kgf/cm2. Such a preliminary reduction in pressure occurs more rapidly due to the influence of a pressure change is not only leaks, but also put on the cooling of the main reservoirs of heated during compression in the compressor air.