The rubber diaphragms used by train brakes could pass the air pressure in the air brake distribution valve, and straightly affected the brake property and running safety.

The investigation and analysis are made on the natural braking in operation of very few cars with 104 type passenger car distribution valves and with electronic WSPs.

In the development of GTF-01 24 through-turn valve,the technique of imitator shift bed is adopted at the multichannel turn distributing valve.

Through the comparison of the working environment and technical characteristics of M483 distributing valve of 8G locomotive with homemade 109 type distributing valve,this paper discusses on the feasibility and practicability of using 109 type distributing valve as a substitute for M483 distribute valve.

A computer simulation model of Chinese 120 vehicle distributing valve and its test rig has been established, with this model almost all test processes of 120 distributing valve on the test rig have been predicted, and the results show a good coherence with experiment data.

Via comparison of trouble data of 104 distribution valves for passenger trains on Nanjiang Line and Lanxin Line,the causes to frequent troubles in 104 distribution valves for passenger trains on Nanjiang Line are analyzed,and the scheme for solving the problems is put forward.