Discussion on the Equivalence of the Release Valve Flux Test in Two Kinds of Test Rig

According to the condition that the equivalence of the test standard between 705 test rig and new 120 test rig,test rig simulation system is used to predict the experimental process.The release valve flux test in two kinds of test rig is simulated.The results show that the charging time of brake cylinder of flux test,the test standard of 705 test rig is faster than the new 120 test rig,there is a big range of overlap between the two standards,the qualified valves whose charging time of brake cylinder are less than 2.55 seconds in 705 test rig are not qualified in the new 120 test rig,meanwhile the qualified valves whose charging time of brake cylinder are between 3.09 and 4 seconds in new 120 test rig are not qualified in the 705 test rig.The test standards of the two kinds of test rig are not equivalence,it is essential to make some efforts to unify the test standards.This work can provide some references to unify the test standard of two kinds of test rig in the future.