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The effect of the 120 valve apeture to the brake system performance

ZHAO Yang,WEI Wei(Provence Key Lab of Vehicle Engineering Advanced Technology,Dalian Jiaotong University,Dalian 116028,China)  
The influence of emergency valve III hole,the local reduction valve hole,and the acceleration release cylinder hole to the train pipe on brake system characteristics was simulated with the train braking system numerical simulation method which based on air flow theory.The results show that the emergency valve III hole's size has obvious influence to the emergency brake characteristic of train: the hole size in the range of(2.3 ~ 2.7) mm ensure the emergency application valve does not work in normal brake;the emergency valve III hole is bigger,its brake propagation speed is slower,the hole increases from 2.35 mm to 2.65 mm and its brake propagation speed changed from 283.6 m/s to 244.2 m/s,reduced by 14.2% when it works;the size of the local reduction holes has influence to the service application brake propagation speed,the bigger,the faster;the brake propagation speed increases 77.4% as the hole increases from 0.5 mm to 1.5 mm;the acceleration release cylinder to the train pipe has obvious influence to the release propagation speed,after releasing 100 kPa in breaking,as the hole increased from 0.5 mm to 1.5 mm,the release propagation speed increased by 53.1%,release after small amount of breaking,the hole size has little influence to the release propagation speed.This work will benefit the new valve design.
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