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sir, this is prakash from india. i'm an student in the final year of mechanical Engineering. I am doing a live project under railway wagon workshop here. i'm the leader of my project team. The task we were allotted is a major one and i need some help from u if it is possible, i hope u can be helpful in guiding me to complete my project. the problem is as follows: here in the workshop, the distributor valves of different wagons are detached, cleaned and tested in the air brake system unit whether they are functioning properly or not. There is a tolerance limit given to the workers here that out of 100 distributor valves(DV) some 10 DVs can be left unrepaired, ie 10 out 100 DVs which contain some minor repairs can be overlooked which do not have major effect on application of brakes. The train that leaves the workshop after getting repaired moves to the main station which is some 20 kms away from here. Further the DVs are checked there and to the surprise of the workers there, some of those 10 dvs( out of 100) which were reported as having minor troubles seems to be working properly and the dvs that are certified alright by the workshop started giving troubles. Same is the case happening at other workshops as well and the staff cannot find what was really happening. There are no major atmospheric differences at these areas and the problem seems to be a mystery. This is a challenging task and i was asked to find the reason for it. I will be thankful to if u suggest me any reasons for this. Ofcourse I am doing my own work for this. Only your answer will be a guide to me. thanking you sir yours sincerely prakash
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