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Do not have to spend a penny, with the abandoned air duct rubber ring on the governance of the valve stem drip chronic disease. This is the Harbin locomotive depot two monitors the result of their brains. This alone, each year for the cost savings of more than 10,000 yuan. Locomotive fuel in the unloading transport, regulation custody, measurement and other aspects of the release, have to go through the check valve this off. Fuel is aggressive and new valves start to drip in less than six months. According to statistics, every year a subsection to miss 1,100 kilograms of fuel, equivalent to nearly 4,000 yuan. Wang Yao-Bin, metrologists, and Yan-Lin Chen started thinking twice about the problem of leakage control two years ago. After many experiments, they found that discarded air duct rubber ring as a valve packing material, leakage control effect is obvious. With this method, each year for the block plugging the fuel more than 3000 kilograms.