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对挖掘机出厂试验中出现动臂油缸下降超速的问题进行了分析，叙述了平衡阀的工作原理、特点及选择方法，提出了改进措施，并进行了试验验证。
The problem that the speeding down of the boom cylinder is appeared during the factory test of the excavator is analyzed. The working principle, characteristics and selection methods of the balance valve are described, the improvement measures are put forward and the test is validated.