Method for testing the tightness of the main air stream line on automatic pneumatically operated brakes in rail vehicles and arrangement for making the same

摘要

The aim of the present invention is to carry out a tightness test, which is independent on disturbing influences according to criteria, producing an unambiguous test result. To this end there is used a bypass, which is mounted parallel to a solenoid valve (1) with a larger cross-section for filling the main air stream line (2) in the direction of flow, with a second solenoid valve (4) having a smaller cross-section, together with a volume flow sensor. The filling of the main air stream line (2) takes place by opening the solenoid valve (1) with the larger cross-section while the solenoid valve (4) with the smaller cross-section remains closed. In order for the tightness test to take place, the solenoid valve (1) with the larger cross-section is closed and the second solenoid valve (4) with the smaller cross-section is opened, whereby a volume flow is filled, said volume flow being required at least to maintain the pressure in the main air stream line (2). The filled volume flow is measured and is taken as a criterion for the tightness of the main air stream line (2). The present invention also discloses an arrangement for making the above-described method, said arrangement comprising a bypass line, which is mounted parallel to a solenoid valve (1) with a larger cross-section for filling the main air stream line (2) in the direction of flow, with a second solenoid valve (4) having a smaller cross-section, together with a volume flow sensor.